272 
5, convexiusculis, obtuse angulatis, subcanaliculatis, spiraliter 1— 
2 late sulcatis, striis spiralibus minutis, longitudinalibus minutis- 
simis sculptis, colore nigro obscure minutissimeque griseo-lineato, 
ultimo anfractu basi subplanato 4-5 sulcis profundis spiralibus 
sculpto, margine obtuse subangulato, umbilico prof unde perforato, 
late aurantio, aperturd subrotunda, labro externo tenui, nigro 
marginato, labro columellari albo \-2-dentato, dentibus incequali- 
bus munitis, dente inferiore minimo, fauce albo-margaritaceo . 
Alt. 0 T 7 p- } lat. max. 1, alt. apert. unc. 
Variat costis obliquis transversis. 
With the last 
Trochus (Margarita) purpuratus, sp. nov. 
(PI. XI. fig. 11.) 
T. testd turbinatd, spird depressd, prominuld, anfractibus 5, con¬ 
vexiusculisnitidis, Icevigatis, striis incrementi minutissimis, ro- 
seolis fasciis spiralibus Icete purpureis cinctis, suturis impressis, 
basi margine subrotundato, umbilico imperforato, albo, aperturd 
subrotunda, labro externo tenui, labro interno Icevi, obsolete un- 
dulato, albo-margaritaceo, faucibus purpureo-margaritaceis . 
Alt. lat. max. O^-, alt. apert. 0-=^ unc. 
A beautiful little species. W. coast of N. America? 
Trochus (Margarita) Hillii, sp. nov. (PI. XI. fig. 10.) 
T. testd late turbinatd, heliciformi, spird obtusa, parvd, 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. Ofz, lat. max. 0^-, alt. apert. 0 T 3 T 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. (PI. XI. fig. 2.) 
N. testd subglobosd, spird brevi, anfractibus 5, nitidis, sub lente 
striatis, flaveolis, fasciis transversis fuseo-purpureis, angulato- 
undulatis fammulatis, in adulto obsoletis seu fascias obscuras spi- 
rales simulantibus; aperturd ovatd, superne obsolete angulatd, co- 
lumelld costa callosd albd spirali in umbilicum oblique intrante, 
umbilico superne perforato ; faucibus fasciato -f uscatis. Operculo 
calcareo, albo, Icevi, polito, sulco angustissimo prope margine ex¬ 
terno, margine interno recto, crenulato. 
Alt. 1 unc.; long. anfr. ult. t 9 q-, lat. t 9 q unc.; long, apert. ff unc. 
Mazatlan. I have dedicated this pretty shell, which reminds us 
of the Atlantic intricata , 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 abundance. 
Fig. 2 c. represents the young shell. 
