Zoological Society. 307 



2 late sulcatis, striis spiraUbus mimitis, longitudinalibus minutis- 

 simis sculptis, colore nigro obscure minutissimeque griseo-Uneato, 

 ultimo anfractu bast subplanato 4-5 sulcis profundis spiraUbus 

 sculpto, margine obtuse subangulato, umbilico profunde perforato, 

 ,i lati aurantio, aperturd subrotundd, labro externo tenui, nigro 

 eiit marginato, labro columellari albo l-2-de7itato, dentibus incequali' 

 »' bus munitis, dente inferiors minimo , fauce albo-margaritaceo, 

 Alt. 0^-^, lat. max. 1, alt. apert. 0^^^ unc. 

 Variat costis obliquis transversis. 

 With the last ^""^ "^ .ATA^Wfe ' 



2 Trochus (Margarita) purpuratus, sp. nov. 



T. testd turbinatd, spird depressd, prominuld, anfractibus 5, con- 



vexiusculis, nitidis, Iccvigatis, striis incremenii minutissimis, ro- 



. . seolis fasciis spiraUbus Icete purpureis cinctis, suturis impressis, 



hasi margine subrotundato, umbilico imperforato, albo, aperturd 



gj^> subrotundd, labro externo tenui, labro interno Icevi, obsolete un- 



g^i dulato, albo-margaritaceo, faucibus purpureo-margaritaceis. 



Alt. 0/^, lat. max. Oy^, alt. apert. Oy^ unc. ^ ,^^^ %^, -j^^^^ 



A beautiful little species. W. coast of N. America? 



Trochus (Margarita) Hillii, sp. nov. 



T. testd late turbinatd, heliciformi, spird obtusd, pardd, depressd, 



'''' anfractibus 5 convexiusculis, lavigatis, politis, ad suturas appres- 



»^ sis,flaveo-albidis, ultimo anfractu maximo, basi convexo, margini- 



"'^ ' bus rotundatis, centraliter excavato, imperforato, aperturd oblique- 



subrotundd, labro externo tenui, columellari leviter arcuato, albo ; 



.. faucibus albo-margaritaceis. 

 ®^'Alt. 0/2^, lat. max. Oy^, alt. apert. O^j unc. 

 "^-From the northern shores of the W. coast of N. America ? 



I have dedicated this species to — Hill, Esq., Master of the 



* Herald.* 



Natica Pritchardi, sp. nov. 



N. testd subglobosd, spird brevi, anfractibus 5, nitidis, sub lente 



striatis, flaveolis, fasciis transversis fusco-purpureis, angulato- 



undulatis fiammulatis, in adulto obsoletis seufascias obscuras spi- 



rales simulantibus ; aperturd ovatd, superne obsolete angulatd, co- 



*' lumelld costd callosd albd spirali in umbilicum oblique intrante, 



umbilico superne perforate ; faucibus fasciato-fuscatis. Operculo 



^^" calcareo, albo, leevi, polito, sulco angustissimo props margine ex- 



* terno, margins interno recto, crenulato. 



Alt. 1 unc. ; long. anfr. ult. ^^q, lat. -^^ unc. ; long, apert. y'^- unc. 

 ' Mazatlan. I have dedicated this pretty shell, which reminds us 

 of the Atlantic intricatUy to my friend Dr. Pritchard, Assistant- 

 Surgeon of H.M.S. Calypso, who assiduously collected on the coast 

 of Mazatlan, where he, as well as the officers of the * Herald' and 



* Pandora,' met with this species in abundftiv:efr-j, <;•/ ) ^ ju lOJil 



Planaxis nigritella, sp. nov. ^v;,5;,;5.>-t;\^v^ ^^^si5o b1i?M .T 



N. testd ovato-lanceolatd, crassiusculd, fusco-nigridd, spird brevi, 

 acutd, anfractibus 6, spiraliter sulcatis, intersiitiis latis, planis, 



20* 



