some ne.ip and jx'culinr M(jllusca. 'A'2\ 



of Biscay, 718-10!)") fins. 'Cliallengci- ' Expedition, west of 

 Faval, Azores, 1000 fnis. 



w 7 7 



Velutinidae. 



Pilidium radiatum, Sars. 



Capiiliis radinttia, Savs, B»>rptninp oni en i Sommcnm 1849 foretagen 

 ZDulo^risk Ueise i Lofoten oj,' Fiuniarken, p. (54 ( 1850). 



Body niilk-white : mantle very thick, covering one tliird 

 of the mouth of tlie shell : tentacles club-shaped, slender, com- 

 pressed or tlattencd, contractile, closely striated across at the 

 tips, and thii-kly covered with short cilia : ejjes placed on 

 small l)ull)s near the outer base of the tentacles: foot oblong, 

 ])roportionally small, rounded and double-edgc<l in front, and 

 bluntly pointed behind. Very sluggish, and exudes a large 

 quantity of stringy slime. Adhering to a dead shell. 



•Station o, 57 fms. (a single specim.en) ; Holsteinborg, 12 fms. 

 (a young shell). Spitzbergcn (Torell) ! Finmark (M. Sars) ! 

 Sea of Okhotsk (Middendorff) ! Japan (A. Adams). Aleu- 

 tian or Fox Islands, N. Pacific (Dall) ! Fossil : Uddevalla 

 and Kurild, Sweden (Hisinger, J. G. J.) ; Moray Firth (Robert 

 Dawson) ! Montreal (Principal Uawson). 



Synonyms : Pilidium commodum, Middendorff, 1851 ; Pilis- 

 ciis commodus and Piliscus ^^^'ol^^^j Loven, 1859 ; Capubis 

 dilatatus and C. depressus, A. Adams, 1860 and 1864. 



Tlirough the kindness of Professor G, O. Sars and of Dr. 

 L. von Schrenck I have lately been able to compare with my 

 specimens from Davis Strait the typical sjiccimcns of Capulus 

 radiatus and Pilidium covimodum from the Christiania and 

 St. Petersburg Museums. All of them exactly agree with 

 each other, as well as with my fossil specimens of Piliscus 

 jivohus (Lovt^n) from Uddevalla. Sars's Norwegian shell and 

 mine from 57 fathoms in Davis Strait are marked with coloured 

 streaks, which radiate from the apex or crown, while the others 

 are not streaked or coloured. 



The generic name Pilidium was published by ]\IiddendorfF 

 in his ' Malacozoologia llossica,' 1841). Professor Forbes gave 

 the same name for Tectura fulva in the lleport of the British 

 Association for 1849, published in 1850; and Pilidium wan 

 described in 185)3 by Forbes and 11 anloy as their generic name 

 for the last-mentioned shell. The late Professor Sars substi- 

 tuted, in 1858, the generic name Capulacma-a for his Cajndus 

 radiatus. Professor Loven, in 1 859, proposed P/V/scm*. Pos- 

 sibly Capulus fallax of ]\lr. S. V. ^Vood (a Crag fossil) may 

 be another species of Pilidium. 



