some new and peculiar Mollusca. 235 



operculum smooth, having 6 or 7 whorls, which are divided 

 bj raised lines, L. 0'125. B. O'l. 



Station 13, 690 fms. ; a single young and living specimen. 

 ' Lightning ' Expedition, 189 fms. ' Porcupine ' Expedition, 

 1869, between the Orkney and Faroe Isles, 290 fms. : 1870, 

 coast of Portugal, 740-1095 fms. Lofoten Isles, 200-300 

 fms. (G. O. Sars, as " C. nitens " of M. Sars) ; Bergen 

 district, 50-400 fms. (Friele) ; Upper Norway (Lilljeborg, 

 M' Andrew) ; Drobak (Verkriizen). 



The description has been taken from Norwegian specimens. 

 I Avould have substituted for hasistriatum another specific 

 name ; but the present name has been adopted by Weinkauff 

 in his ' Catalog der im europaischen Faunengebiet lebenden 

 Meeres-Conchylien,' as well as by Friele in his ' Oversigt 

 over de i Bergens Omegn forekommende skaldtegte Mollus- 

 ker,' on my authority. Probably C. Icevis of Searles Wood, 

 from the Coralline Crag at Sutton, which he refers to the 

 Delphinula Icevis of Philippi, may be the young of the 

 present species. Philippi's species is unquestionably C. ser- 

 indoides. 



C. hasistriatum is not so globular as C. Cutlerianum, and 

 is comparatively gigantic ; the sculpture is coarser, and the 

 operculum is smooth. 



MoUeria costulata, Moller. 

 Margarita ? costulata, Moll. Ind. Moll. Groenl. p. 8. 



Body ' white, with a faint tinge of creamcolour or pale 

 yellowish : head small and short, semicircular, and resembling 

 that of the section Margarita of TrocJius : mouth vertical, 

 continually opening and shutting : tentacles elegant and fea- 

 thery, but not ciliated : eyes rather large and round, placed 

 on small bulbs or tubercles at the outer base of the tentacles : 

 foot broad, squarish and double-edged in front, angular or 

 bluntly pointed behind : the upper part of the foot has tenta- 

 cular processes or filaments (four on each side), as in Trochus^ 

 which, however, are not ciliated in MoUeria costidata^ but are 

 notched at the edges, and are conical and short ; none could 

 be detected in front of the foot, as stated by Moller in his 

 description. His words are '' Margaritis quidem affinis, ab 

 illis propter peristoma continuum apertur^e et pedem animalis 

 antice filamentis obsitum diversa est." The animal crawls 

 rather quickly, but painfully. 



Station 4, 20 fms. ; 5, 57 fms. ; Holsteinborg, 10 and 35 

 fms. Greenland (Moller) . Iceland and Spitzbergen (Torell). 

 Oxfjord, Finmark (M. Sars). * Lightning ' Expedition, 170 



16* 



