ACADEMY OP NATURAL SCIENCES. 223 



Genus Nassa, Lam. 

 Nassa insculpta, Cpr. n. s. State Collection, No. 1008. 



,N. t. satis elevata, compacta, tenuiore, elegantissima, marginibus spirae sub- 

 rectis ; albescente, rufo-carneo varie maculata ; anfr. nucl. iv. tevibus, norma- 

 liter augentibus, apice minuto, satis extante ; norm. v. subrotundatis, suturis 

 satis impressis ; apertura subrotundata, canali acute reflexa ; tota superficie 

 sulculis aaquidistantibus, quarum x. anfr. penult, apparent, insculpta ; anfr. norm, 

 ii. primis costulis quoque radiantibus circ. xvi. baud expressis ornata ; labro 

 rotundato, extus varicoso, intus sulcidentato ; labio valde calloso, supra basim 

 seu parietem expanso, baud extante, intus ruguloso. 



Long. 0-80, long. spir. 0-43, lat. 0-46, div. 45°. 



Hab. Catalina Island, 30-40 fm. ; 15 mostly alive, but few mature ; animal 

 wbite; Cooper. 



This singularly beautiful species probably belongs to the section Zeuxis, H. 

 & A. Adams. The callus is slightly reflexed in the best specimen. 



Genus Amycxa, H. & A. Adams, 1858. (auctum.) 

 ? Amycla chrysalloidea, Cpr. n. s. State Collection. No. 613. 



? A. t. parva, eleganter effusa, marginibus spirae utrinque excurvatis ; albida, 

 rufofusco conciune punctata seu tincta ; interdum striga albida subsuturali, ruf- 

 ofusco tesselata ; anfr. nucl. iii. laevibus, baud tumidis, apice declivi ; norm, v., t. 

 adolescente planatis, dein tumidioribus, suturis distinctis ; tota superficie ele- 

 gantissime tenuiter sulcata, sulcis a?quidistantibus, aufr. penult, circ. xx. : aper- 

 tura flexuosa subpyriformi ; canali oblique sinistrorsum truncata, axi quasi 

 umbilicata ; labro intus acuto, postice siuuato, deorsum quasi tumidiore, intus 

 vii-dentato ; columella torta ; labio antice rugis paucioribus interdum munito. 



Long. U-37,long. spir. 0-22 ; lat. 0-14 ; div. 25°. 



Hab. San Pedro, 1 on beach ; San Diego, 30, some alive in 8 fins, on sand, 

 in upper part of bay. Cooper. 



This is one of the most beautiful, but (without a knowledge of either animal, 

 or operculum) most puzzling of the small shells of California. It has relations 

 with Enryta, Tmncaria, Metula, and DaphneUn. 



Genus Anachis, H. & A. Adams. 

 Anachis subturrita, Cpr. n. s. 

 A. t. minuta, angusta, Rissoiuoidea, pallide purpureofusca, albido maculosa ; 

 anfr. nucl. ? (decollatis) ; norm. v. subplanatis, suturis distinctis ; costulis radi- 

 antibus circ. xx. angustis, vix extantibus, parum flexuosis ; sculptura spirali 

 nulla ; apertura quadrata ; labro acuto deorsum tumente, postice sinuato ; labio 

 conspicuo ; columella torta, truncata. 



Long. 0-13, long. spir. 0-09, lat. 0-05, div. 30°. 

 Hab. San Diego, Cooper. From shell washings. 



The only specimen seen of this tiny species is not quite mature, and has 

 formed no labral teeth. 



