306 Zoological Society. 



have been. A few specimens of considerable interest were taken by 

 the ' Herald' at Cape Krusenstem. The new species are all from the 

 American shores. There are no products of deep-sea dredging. 



As many of the following new forms are from the coast of Ma- 

 zatlan, Mr, Cuming, whose experience and advice have been taken, 

 and magnificent collection consulted in drawing up this report, has 

 considered it desirable that some undescribed shells contained in his 

 collection, from that region, should be described at the same time. 



Trochita spirata, sp. nov. 



T. testd conicd, fusco-purp^ired, longitudinaliter radiato-sulcatd, 

 sulcis numerosis, prominentibus , subrugosis ; anfractibus 6, anguS' 

 tis ; lamind internd spirali, depressd, magnd, margine undulato. 

 Diam. 2^-^, alt. 1^^ unc. 



A very handsome species of this group, allied to Calyptrcea sor- 

 dida of Broderip, and differing from the well-known T. trochiformis 

 in having very much narrower and more numerous whorls, as well as 

 in its internal colouring. It was procured at Massaniello, in the 

 Gulf of California. 



Trochus castaneus. Nuttall, MSS. 



T. testd late- conicd, crassd, late castaned, spiraliter flavo-lineatd, 

 anfractibus 6, convexiusculis, omnibus spiraliter sulcatis, sulcis 

 numerosis, ultimo lato, basi subangulato, convexo, imperforato, 

 aperturd subquadratd, margaritaced, suturis impressis. Oper- 

 culum ? 

 Alt. yV' ^^^' To J long, apert. -^-^ unc. 



The number of sulcations in the second whorl is about six ; the 

 cavities are always rich chestnut, the elevations yellowish. The ge- 

 neral form is intermediate between that of ziziphinus and alabastrites. 

 The shell has long been known under Nuttall' s manuscript name, 

 but never, so far as I am aware, described. It is from Upper Cali- 

 fornia. 



Trochus (Monodonta) gallina, sp. nov. 



T. testd obtuse pyramidali, crassd (adultus ponderosus), spird magnd, 

 anfractibus 5, glabris, obsolete oblique striatis, convexiusculis, 

 albidis, fasciis angustis numerosis purpureis ornatis, anfractu 

 ultimo prope suturam subcanaliculato, basi lateribus rotundatis, 

 umbilico albo, imperforato, impresso, aperturd subquadratd, labro 

 externa subpatulo, margine acuta, Icevi, nigrescente, labro colu- 

 mellari bidentato, albo, faucibus margaritaceo-albis, operculo cir- 

 culari, cornea, fusco, spiris numerosissimis, confertis. Testa, 

 junior spird depressiusculd. 



Alt. ly^^, lat. max. \-^^, alt. apert. Q^^ unc. > 



Probably from the Mazatlan coast. , 



Trochus (Monodonta) aureo-tinctus, sp. nov. 

 T. testd obtusi pyramidali, crassd, spird mediocri, anfractibus 4 vel 

 5, convexiusculis, obtuse angulatis, subcanaliculatis, spiraliter 1- 



