Ctenamphiura dawbini sp. nov.

Fig. 11.—Proximal half of arm viewed obliquely, mainly from below. Fig. 12.—Fig. 13.—Portion of arm, viewed from above at a point where the arm is downwardly flexed, exposing the arm-plates more fully than in Fig. 12. Fig. 14.—Adoral view.

Fig. 11 to upper scale; Figs. 12 and 13 to scale at left; Fig. 14 to lower scale.

Abbreviations: 1, first, or infradental, oral papilla, 2, second, or apparent, outer papilla. 3, third, or true, outer papilla, reflexed below second papilla. A, adoral plate. AM, ambu-lacral vertebra. D, upper arm-plate. G, genital cleft. GS, outer genital scale. L, lateral arm-plate. M, madreporite. N, naked adoral interradial region. O, oral shield. PL, orel plate, S, radial shield. SP, arm-spine. T, tooth. TE, tentacle-scale. V, lower arm-plate.