426 Dr. P. P. Carpenter on new Forms of Mollusca 



radiatim vix ornata ; epidermide leevi, tenui, iugaci ; costa pulmo- 

 nali intus et extus valde conspicua, tumente ; vertice obtuso, 

 plerumque ad quadrantem, interdum ad trientem totius longitu- 

 dinis sito ; intus intense nigro-fusco, margiue acuto. Long, '46, 

 lat. -33, alt. -17. 

 Hah. Nceah Bay {Swan). 



This genus, which culminates in western tropical America and 

 at Cape Horn, is not known in California. Tlie Vancouver spe- 

 cies resembles S. lateralis and its congeners, but differs in having 

 an enormous lung-rib and no colour- rays. 



16. Mopalia {Kennerleyi, var.) Swannii. 



M. testa M. Kennerleyi typicse simili, sed jugo fornicato, haud cari- 

 nato ; omnino rubida, sculptura multo minus expressa ; areis late- 

 raUbus vix definitis ; latera versus subgranulata ; dorsum versus 

 lineis jugum versus procedentibus, interstitiis punctatis ; sinu 

 postico latiore ; limbo pallii lato, coriaceo, vix piluloso. Long. 

 2-4, lat. 1-, div. 120°. 

 Hal). Tatooche Island {Swan). 



23. Margarita Cidaris, A. Ad. 



M. testa magna, conica, Turcicoidea» tenui ; albido-cinerea, nacrco- 

 argentato; anfr. nucleosis?...(decollatis), norm, vii., subplauatis; 

 suturis alte insculptis ; superficie spirse tota valide tuberculosa, 

 seriebus tribus, alteris postea intercalantibus ; peripheria et basi 

 rotundatis, carinatis ; carinis circ. viii., haud acutis, irregularibus, 

 scabris, haud tuberculosis ; lacuna umbilicali vix conspicua ; aper- 

 tura subrotundata ; labro tenuissimo ; labio obsoleto ; columella 

 arcuata. Long. 1*1, long. spir. -65, lat. -75, div. 60°. 

 Hab. Neeah Bay {Swan). 

 Mr. A. Adams suggested the above expressive name for this 



very remarkable and unique shell. 



25. Gibbula parcipicta. 



G. testa solidiore, parva, conica, pallida, purpureo-fusco varie nebu- 

 losa et maculata; anfr. v., rotundatis; carinis ii. validis in spira 

 se monstrantibus, minore intercalante ; interstitiis subsuturalibus, 

 subleevibus, inter carinas obtuse decussatis ; lira peripherica de- 

 finita, ssepe in spira se monstrante ; basi valde rotundata ; liruhs 

 basalibus circ. v. rotundatis, subdistantibus ; apertura subcirculari ; 

 columella arcuata ; umbilico majore, infundibuliformi, haud angu- 

 lato. Long. -14, long. spir. '07, lat. '13, div. 70°. 

 Hab. Neeah Bay {Swan) ; Santa Crux {Rowell). 



26. Gibbula succincta. 



G. testa parva, subelevata, solidiore; livida, testa jun. strigis angustis, 

 creberrimis, fusco-purp areis penicillata, testa adulta maculis quo- 

 quemagnis nebulosa; anfr. v., subquadratis ; Uris obtusis medianis 



