CLIOPSIDAE 293 



Distribution. Indian Ocean, north of New Amsterdam Island, 2000 m. 

 (Valdivia Expedition). 



Genus Pneumodermopsis, Keferstein 

 Pneumodermopsis macrochira, Meisenheimer, 1905. 

 St. 89. Young-fish trawl, 1000 (-0) m. : i specimen. 



This specimen, measuring 5 mm. in length, was taken west of Cape Town. The 

 radula was examined. 



The genus has a lateral but usually no posterior gill : the buccal appendages consist 

 of three groups of suckers, hook sacs and radula n-i-n. P. macrochira has about forty 

 suckers of equal size and a much larger terminal one on each lateral arm. Five stalked 

 suckers take the place of the median arm. There is a very rudimentary posterior gill : the 

 radula is 6-1-6, and there are about twenty hooks. 



Distribution. Southern part of Atlantic and Indian Oceans (Meisenheimer, 1905). 

 Ten stations in the North Atlantic, extending from the latitude between Bermuda and 

 the west coast of Morocco to 48° 29' N, 13° 25' W (Bonnevie, 1913). Three stations on 

 the west of Ireland, from 50° N to 51° N by 1 1° 26' W to 11° 38' W, over soundings of 

 625-990 m. (Massy, 1917). Two stations in the Atlantic from near the Canaries and 

 between the Azores and the West Indies (Pruvot-Fol, 1926). 



Family CLIOPSIDAE 



Genus Cliopsis, Troschel, 1854 



Cliopsis krohni, Troschel, 1854. 



? Cliopsis modesta, Pelseneer, 1 887. 



St. 270. Young-fish trawl, 200 (-0) m. : i specimen. 



St. 287. Young-fish trawl, 800-1000 (-0) m. : i specimen. 



The specimens recorded above, measuring 9-12 mm. in length, were taken in hauls 

 off Africa between Elephant Bay and the Gulf of Guinea. Mme Pruvot-Fol (1924, 

 p. 363) thinks that C. modesta, Pels., should be placed in synonymy with C. kroliiii, at 

 least until its radula is known. 



The family Chopsidae is distinguished by having no lateral gill and no median lobe 

 to the foot. A dorsal glandular pit is present and there is generally a posterior gill. The 

 skin is transparent and colourless or lightly tinted and opalescent. The head is small and 

 the body swollen. The proboscis is extremely long: a jaw and shallow hook sacs are 

 present: the radula has the formula n-i-n. 



In Cliopsis krohni the gill consists of a hexagonal crest with four short unfringed rays: 

 radula 6-1-6: hooks about sixty. 



Distribution, Mediterranean, various authors. Western Mediterranean, especially 



to the west of Corsica and between Minorca and the African coast (Pruvot-Fol, 1924) 



4-2 



