162 



it was not ouly brought by "Mr. Bridges, but also by a gentleman 

 iu Paris, who collected it exactly in tbe šame place. Two specimens 

 are in Mr. Cuniiug's coUection, of whicb one, very much thickened, 

 appears to have formed part of a much larger shell. 



9. Pyrgula auADRicosTATA, n. s. P. testą ovali, alba, spira 

 haud acuminata, marginibus ezciirvatis ; carinis iv. acutis 

 cincta, ątiarum ii. in sjnra extant, tertia vix siipra suturam 

 impressam apparet, rpiarta circa basin ; aperturam verstis, 

 costulis incrementi decussata ; apertura lata ; labro fenui a 

 plica ąuarta parietali interrupta. 



Long. -28, long. spir. -16, lat. -15, div. 40°. 



Ilab. In ? flumina Sinus Panamensis ; legit T. Bridges. Sp. un. 

 in Mus. Cuming. 



This pretty little shell is the Pacific analogus of the Swiss species 

 for which the genus was constituted ; differing, however, iu form 

 and number of keels. The specimen has been tenanted by a hermit 

 crab, and has Bryozoa near the mouth. 



10. Erato ? Maugeri^, var. Panamensis. E. testą " E. 

 Maugerise " simillima, sed majore, vix graciliore, apice minore, 

 spira plerumque extantiore. 



Long. -28, long. spir. -03, lat. '18, div. 130°. 



Hab. Iu Sinu Panamensi; legit T. Bridges. Sp. tria in Mus. 

 Cuming. 



The differences are so very trifling between the specimens exa- 

 mined from the Pacific and West Indies as not to justify (without 

 further kuonledge) a specific separation. They do not appear con- 

 stant in either type. The first whorl in the Pacific shells is some- 

 what smaller, while the shell is larger. 



11. ? CiTHARA siNUATA, U. S. C. testū trūpezoidea, spira sub- 

 elevata, marginibus excurvatis ; albida, rufo-fusco varie tincta ; 

 anfr. ix., subrotundatis, sutura parum impressa, ąuarum iii. 

 nucleosi, diaphani, Iceves, dein liris spiralibus et radiantibus 



fortiter cancellatis ; normaliter liruJis radiantibtis et striulis 



spiralibus tenue sculptis, in anfr. uit. subobsoletis ; apertura 



lineata, canali anteriore haud profundo, curtissimo ; labro 



acuto, ad dorsum calloso, sinu antico pai'vo, postico angusto, 



profundo, intus haud denticulato ; labio parietali haud calloso. 



Long. -43, long. spir. -18, lat. -17, div. 43°. 



Hab. In Sinu Panamensi ; legit T. Bridges. Sp. tria in Mus. 



Cuming. 



Closely related to Pleurotoma concinna, C. B. Adams, Pan. Shells, 

 No. 167, from the description of which it differs in the whorls not 

 being angular, and the sculpture on the spire being coarser, instead 

 of finer, than the ręst. 



12. Mangelia acuticostata, n. s. M. testą parva, turrita, 

 albida, rufo-fusco tincta; marginibus spira excurvatis ; anfr. 

 vii. subtumentibus, superne obtttse angulatis, sutura impressa; 



