Zoological Society. 481 



tis ; varicibus numerosis, foUaciis simplicibus, superne elongatis, 

 fornicatis, cBtate valde erosis ; aperturd qiiadratd, jiallide earned ; 

 lahro intits lavi, in/erne dente magno, crasso, obtuso ; cunali tor- 

 tuoso, aperto, ad sinistram inclinoto ; wnbilko prcecipue magno. 

 Axis &% lin. 

 Hab. San Diego, California. From a bank of mud near the head 

 of the harbour. 



JVIuREx CALiFORNicus. Muv . testd fus'iformi, fulvd, trivaricosd; 

 anfractibus senis, superne planulatis, trunsversim costatis, costis 

 rotundatis, subdistantibus, ad lacinias varicum inctirrentibus, in- 

 tervallis costellatis, creniferis ; varicibus sex-laciniatis, supremd 

 maxima alatd, deinde gradatim minoribiis creniferis; aperturd 

 ovali, Icevi ; canali clauso, recurvo, ad basin purpurascente . Axis 

 18 lin. 

 Hab. California. Mus. Cuming. 



MuREx HAMATus, Mur. testd rhomboided, pallide luted, multiva- 

 ricosd ; anfractibus septenis, inter varices areis quadratis ; spird 

 subelongatd, acutd ; varicibus senis alatis, laciniis uncinatis ; aper- 

 turd ovali, infer ne dente purvo acuto ; canali clauso, rectiusculo. 

 Axis 13^ lin. 

 Hab. Bay of Guayaquil; from a muddy floor, in twenty-one fa- 

 thoms. 

 This shell, together with M. emarginatus, M. monocei'os and M. Nut- 

 tali, belong to a section of the genus which has been called by Con- 

 rad Cerastoma. But if the marginal tooth of the aperture is to be 

 regarded as sufficient grounds for seimration, then I fear we must 

 draw freely on some of the typical species, where its existence seems 

 to have been little heeded. Mr. Swainson assigns it as a charac- 

 ter of his subgenus Muricanthus or Centronotus ; but for the above 

 reasons it ceases to possess any importance. In M.hamatus the situa- 

 tion of the tooth on the dorsal varices is marked by a small sharp 

 notch. 



MuREX ciRROsus. Mur. testd fusiformi, ventricosd, pallide earned, 

 formosissime multivaricosd ; suturd profundd, prope tiigricante ; 

 varicibus nonis sexfarinm laciniatis ; laciniis fistulosis, albis, re- 

 spectantibus, gradatim minoribus ; interstitiis eostis rotundatis 

 lacinias incurrentibus ; aperturd ovali; labro intiis leevi ; canali 

 gracili, recurvo, fere clauso, dorso bifariam laeiniato, serie supe- 

 rior e gemind. Axis 9 lin. 



Hab. Straits of Macassar. In fifteen fathoms, among sand and 

 fine gravel. 



An uncommonly beautiful species, both from the delicacy of its 

 colour, and the rich, varied, and elaborate character of its sculpture. 



MuREX GRAViDus. Mur. testd globose fusiformi, multivaricosd; 

 anfractibus senis rotundatis, transversim costatis, superne fusco 

 fasciatis ; costulis approximatis, lamellosis ; varicibus quinis cos- 

 tulis subdivergentibus transitis, posticefoveolatis ; aperturd ovali, 

 productd; labro intiis hevi ; canali longiusculo, aperto, ad sinis- 

 tram inclinato. Axis 10 lin. 



Hab. Cape Blanco, west coast of Africa. From sixty fathoms. 



