14 PROCEEBINGS OF THK MALACOLOGICAL SOCIETi'. 



DESCRIPTION OF CASSIS ABCOCKI, A NEW SPECIES. 

 By G. B. SowEKBY, F.L.S., etc. 



Read 8th Noremher, 1895. 



Cassis Adcocki, n.sp. 



Testa ol)long'o-oyata, albida, nibescente tincta, maculis parvis qnad- 

 ratis, (]iunquo-seriatim dispositis ornata ; spira couica, sub - elongata, 

 obtnsiuscula ; anfractus 6, convoxiusculi, primi Iseves, sequentes 

 spiraliter dense lirati, longitudinaliter plicati, supcrne aiigiilati, supra 

 angulum leviter concavi, lira crassiuscula granulosa conspicue fusco- 

 niaculata juxta suturam instructi ; sutura augusta ; anfractus ultimus 

 oblougus, convexus, leviter intlatus, superne plicatus ; plicis confertis 

 circ. 22, ad angulum nodulosis ; apcrtura elongato-ovalis ; columella 

 levissimo plicata ; labriim crassum, intus levissime dentato-liratum, 

 extus lajvigatum, conspicue fusco quinque-maculatum. Long. 28, 

 diam. maj. 17, niin. 13 mm. 



Jlah. — Yankalilla Bay, South Australia. 



This is one of the smallest species of the genus ; it is chiefly 

 characterized by the number and smallness of the brown spots con- 

 stituting the five series so prevalent in this group of the genus, as well 

 as by the numerous plications on the posterior half of the shell. The 

 slightly concave area at the top of the body-whorl is bordered against 

 the narrow suture by a prominent brown spotted ridge. 



This new species has been mistaken by South Australian con- 

 chologists for Cassis pila, Eeevc, from which it is obviously distinct. 

 My friend Mr. W. T. Bednall, of Adelaide, being in doubt as to the 

 identification, sent a very dilapidated specimen for my opinion. I at 

 once informed him that it was not C.pila, and that in my opinion it was 

 a new species. Since then Mr. D. J. Adcock has been kind enough to 

 send mc his somewhat smaller but perfect specimen for description. 



Cassis AdcocH, n.sp. 



Cassis Adcochi is so different from C. pila and its allies that 

 comparison is hardly necessary. In form it is much less inflated, its 

 markings are very different, and it exhibits plications such as are 

 altogether wanting in C. pUa. 



I agree with Mr. Tryon that the Chinese C. pila, the Japanese 

 C. Japonica, Reeve, and C. Pfeifferi, Crosse, are forms of one and the 

 same species, but I consider them distinct from the Mediterranean 

 C. saburoti, Lamk. 



