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Some Pycnogonida from Cook Strait, New Zealand, with descriptions of two new species



The specimen is immature, the ovigers consist of only five segments, and the genital apertures appear to be absent. The interest of the specimen lies in the fact that it was taken in a plankton tow net at 600 fathoms. As the net used was of the open type this specimen could have been taken at a lesser depth, but as the water in the vicinity of this station is about 800 fathoms deep there is little likelihood of its being picked up off the bottom. Gordon (1932b) reported an immature specimen of "? Pallenopsis" (= Pallenopsis calcanea Stephensen 1933?) taken in similar circumstances from 850–1100 m in the South Atlantic off the coast of southern Brazil. Similarly, Carpenter (1905) reported an adult of Pallenopsis holti Carpenter = P. tritonis Hoek, taken with a tow net in 382 fathoms off Achill Head, Ireland. Stephensen (1933) and Hedgepeth (1948) both record P. calcanea from tow nettings; the latter author remarks that it is "evidently a bathypelagic species". The present specimen resembles Gordon's and Stephensen's figures of P. calcanea in the presence of a pair of small tubercles on the dorsal surface of the ocular tubercle, but differs from that species in the chelae, legs, and ovigers. This specimen does not appear to be the juvenile of either of the species of this genus so far recorded from New Zealand.