some new and peculiar MoUusca. 235 



operculum smooth, liuvlnp^ G or 7 wliorls, wliicli arc divltlcd 

 bj raised liiu's. ].. 0-125. B. 0-1. 



Station 13, GOO t'lns. ; a siiii^flc yoinif^ and livinp^ sj)ecinien. 

 *■ Li<,ditnin^ ' Expedition, 189 tins. ' rorcupine ' Expedition, 

 1SG9, between the Orkney and Faroe Isles, 290 fnis. : 1870, 

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

 fms. (G. O. Sars, as " C. nitens " of M. Sars) ; Ber-en 

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

 J\rAndrew) ; Drobak (\'erkruzcn). 



Tiie description has been taken from Norwegian specimens. 

 I would have substituted for hasistriatum another specific 

 name ; but the present name has been adopted by Weinkauff 

 in his ' Catalog der im ciuopiiischen Fauncngebiet Icbendcn 

 Meeres-Coiiehylien,' as well as by Fridc in his ' Ovcrsigt 

 over de i Ber'a^is Omeo-n forekommcndc skakhT2:te JMollus- 

 ker, on my authority. Probably C. kevi's of iSearles Wood, 

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

 Deljihimda Icrvis of Philippi, may be the young of the 

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

 liuIoiJes. 



C. basistriafum 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, Miill. Ind. Moll. Groenl. p. 8. 



Body ' white, -with a faint tinge of crcamcolour or pale 

 yellowish : head small and short, semicircular, and resembling 

 that of the section Ma}'(jarifa of Trochas : mouth, vertical, 

 continually opening and shutting : tentacles elegant and fea- 

 thery, but not ciliated : e?/es 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 uj)per part of the foot has tenta- 

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

 which, however, are not ciliated in Molleria 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. Ilis words arc *' Margaritis quidem alfinis, ab 

 illis propter peristoma continuum aperture et pedem animalis 

 antice filamentis obsitum diversa est." The animal crawls 

 rather quickly, but painfully. 



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

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

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



IG* 



