48 Dr. P. P. Carpenter on new Foims of Mollusks. 



norm, v., effusis, subpknatls, ultimo paulum constricto ; costulis 

 radiantibus circ. xx., aperturam versus evanidis ; apertura sub- 

 quadrata ; labro baud iucrassato, interdum iutus subtiliter striate, 

 baud dentato; labio appresso; columella abrupte truncata. 

 Long. -3, long. spir. -2, lat. -11 poll., div. 23°. 

 Variat basi fusco tincta, seu tota superficie ut in Nitidella cribraria 

 picta. 



47. Sistrum (? ochrostoma, var.) rufonotatum. 



S. testa S. ochrostomati simili, sed minore, angustiore, vix tabulata ; 

 alba, linea punctorum rufo-fuscorum subperipheriali, interdum 

 lineis spiralibus, interdum ejusdem coloris maculis, ornata ; vert, 

 nucl. mamillato, anfr. iii., Isevibus, vix tumidis ; norm, v., plus 

 minusve elongatis, in medio nodoso-angulatis, postice planatis, 

 suturis ad angulum valde obtusum conspicuis ; seriebus nodulorum 

 spiralibus iii., quarum postica major, secundum costas radiantes 

 obsoletas circ. vi.-viii. ordinatis ; seriebus anticis inconspicuis ii. ; 

 interdum costulis spiralibus intercalatis ; canali brevi, rectiore, 

 aperto, angusto ; apertura subovali, vix subquadrata, intus pallida 

 aurantiaca; labro acutiore, dorsaliter subvaricoso, postice ssepe 

 sinuato, intus obscure vi. -dentato ; labio conspicuo, interdum ex- 

 stante. Long. '5, long. spir. *23, lat. "32 poll., div. 60°. 



Variat testa obesa, nodulis validis. Variat quoque testa acuminata, 

 nodulis subobsoletis. Long. '52, long. spir. "23, lat. "25 poll., 

 div. 42°. 



48. tNitidella millepunctata. 



IN. testa parva, nitida, livida ; spira exstante, anfractibus subpla- 

 natis, suturis distinctis ; anfr. nucl. Isevibus, adolescentibus obso- 

 lete radiatim lirulatis, adultis Isevibus ; zona alba postica, suturam 

 attingente, aurantiaco maculata ; tota prseter zonam superficie au- 

 rantiaco puncticulata, punctis minimis, creberrimis, in quincunces 

 dispositis ; apertura subquadrata ; labro incrassato, intus vi.-den- 

 tato; labio exstante, a lirulis circa basim spiralibus indentato. 

 Long. '3, long. spir. -17. lat. '15 poll., div. 40°. 



Differs from Columhella albuginosa, Rve., in its peculiar and 



constant painting. 



49. tNitidella densilineata. 



?i\r. testa IN. millepvMctatam forma et indole simulante, sed omnino 

 nitida, anfractibus planatis, suturis indistinctis, striolis circa basim 

 minimis ; livida, lineolis aurantiaco-fuscis divaricatis, saepe ziczac- 

 formibus, densissime signata. Long. -25, long. spir. -15, lat. •! 

 poll., div. 35°. 



The opercula of these two species being unknown, their 

 generic position remains doubtful. The same is true of the two 

 following. 



50. tAnachis tincta. 

 tA. testa parva, turrita, albida, rufo- aurantiaco supra costas tincta ; 

 anfr. nucl. Iffivibus ; norm, iv.-v., subplanatis, suturis valde im- 



