| an. |
Anterior neuropore. |
| av. |
Afferent vessels of subepidermic capillaries of proboscis. |
| bps. |
Body of proboscis skeleton. |
| brg. |
Branchial groove. |
| cbs. |
Central blood-space of proboscis. |
| ccl. |
Collar canal. |
| ccp. |
Prolongations of collar cœlom into the proboscis neck. |
| cfw. |
Circular musculature of outer wall of anterior rim of collar. |
| ch. |
"Chondroid tissue." |
| cl. |
Cleft into which dorsal vessel opens. |
| cm. |
Circular musculature of proboscis. |
| cnc. |
Collar nerve cord. |
| cnl. |
Axial canal of collar nerve cord. |
| coe. |
Collar cœlom. |
| coe. |
Part of collar cœlom into which the collar canal opens. |
| div. |
"Notochord."page 346 |
| dn. |
Dorsal nerve of trunk. |
| dp. |
Dorsal proboscis pockets. |
| dp. |
Blindly ending ventral portions of dorsal proboscis pockets. |
| dsc. |
Fibres of dorso-ventral muscle plate. |
| ds. |
Dorsal septum of collar, |
| dv. |
Dorsal vessel. |
| ep. |
Epidermis. |
| epb. |
Epibranchial strand. |
| eps. |
" End plate " of proboscis skeleton. |
| epth. |
Epithelium of throat. |
| epv. |
Efferent proboscis vessels. |
| g. |
Gonads. |
| gap. |
Genital aperture. |
| gc. |
Gill pocket. |
| gg. |
Branchial canal. |
| gl. |
Glomerulus. |
| git. |
Lateral gonad branch. |
| gm. |
Mesial gonad branch. |
| gnc. |
Genital cushion. |
| gp. |
Gill pore. |
| gs. |
Gill septum. |
| gt. |
Gill tongue. |
| gtb. |
Epithelium of "gill tongue back." |
| gtc. |
Cavity of gill tongue. |
| h. |
Heart-bladder. |
| i. |
Intestine. |
| idv. |
Intestinal diverticulum, just behind branchial region. |
| ifw. |
Musculature of fore wall of anterior rim of collar. |
| ies. |
Low cubical epithelium covering the inner edge of the septal bar and the surfaces of the tongue bars. |
| lb. |
Anterior horn of lumen of the "notochordal " blind sac. |
| lbs. |
Ventral blind sac of "notochord." |
| lc. |
Limiting cushions between branchial canal and œsophagus. |
| lfw. |
Longitudinal musculature of outer wall of anterior rim of collar. |
| lm. |
Longitudinal musculature of proboscis. |
| lmt. |
Longitudinal musculature of trunk. |
| ls. |
Lateral septa of trunk. |
| nf. |
Nerve fibre layer. |
| ngr. |
Nerve fibre ring of proboscis neck. |
| ntr. |
Nerve ring at posterior end of collar. 03. (Esophagus. |
| ol. |
Opening of lumen of "notochord" into the throat. |
| p. |
Proboscis pore. |
| pc. |
Proboscis canal. |
| phs. |
Perihsemal spaces. |
| pps. |
Peripharyngeal space. |
| ps. |
Proboscis skeleton. |
| rf. |
Radial fibres between fore and outer walls of anterior rim of collar. |
| sn. |
Synapticulee. |
| sp. |
Splanchnic epithelium of proboscis ccelom. |
| spr. |
Septal bar of gill skeleton. |
| tpr. |
Tongue bars of gill skeleton. |
| vgs. |
Septal vessel. |
| vn. |
Ventral nerve. |
| vp. |
Ventral proboscis pockets. |
| vps. |
Ventral septum of proboscis. |
| vv. |
Ventral vessel. |
| vw. |
Ventral wall of heart-bladder, |
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