4 Dr. P. P. Carpenter on Pleistocene Fossils 



seriebus, a suturis separatis, spiram ascendentibus ; t. adults, 

 costulis spiralibus, interdutn iv., intercalantibus ; costulis radianti- 

 bus creberrimis ; costis suturalibus ii. validis, baud nodosisj basi 

 eifusa, liris circ. yi. ornata; apertura subquadrata; labro labioque 

 tenuibus ; columella vix torsa, effusa, vix emarginata. 



Hab. Sta. Barbara, Pleistocene, 1 sp. (Jewett). S. Pedro, 

 S. Diego {Cooper). 



The sculpture resembles Cerithiopsis ; but the columella is 

 pinched, not notched. 



Opalia ij.crenatoides, var.) insculpta. 



0. testa O. crenatoidei simili ; sed costis radiantibus pluribus, xiii.— 

 xvi., in spira validis ; anfr. ult. obsoletis ; sculptura spirali nulla; 

 punctis suturalibus minus impressis, circa fasciam basalem Isevem 

 postice, non antice continuis. 



Hab. Sta. Barbara, Pleistocene, 1 sp. [Jewett). 



Very closely related to O. crenatoides, now living at Cape 

 St. Lucas, and, with it, to the Portuguese 0. crenata. It is 

 quite possible that the three forms had a common origin. 



Trophon tenuisculptus. 



T. testa T. Barvicensi simili, sed sculptura minus extante ; Tertice 

 nucleoso minimo ; anfractibus uno et dimidio Isevibus, apice acuto; 

 normalibus v., tumidis, postice subangulatis, suturis impressis ; 

 costis radiantibus x.-xiv., plerumque xii., baud varicosis, angustis, 

 obtusis ; liris spiralibus majoribus, distantibus, quarum ii.-iii. in 

 spira monstrantur, aliis intercalantibus, supra costas radiantes 

 undatim transeuntibus ; tola superficie lirulis increment!, supra 

 liras spirales squamosis, eleganter ornata ; canali longiore, sub- 

 recta, vix clausa ; labro acutiore, postice et intus incrassato, denti- 

 bus circ. v. munito ; labio conspicuo, tevi; columella torsa. 



Hab. Sta. Barbara, Pleistocene formation {Jewett). 



This very elegant shell is like the least-sculptured forms of 

 T. Barvicensis, from which it appears to differ in its extremely 

 small nucleus. It is very closely related to T. fimhriatuJus, A. Ad., 

 from Japan, but differs in texture, and is regarded by Mr. Adams 

 as distinct. It stands on the confines of the genus, there being 

 a slight columellar twist, as in Peristemia. 



Pisania fortis. 



P. testa P. insigni simili, sed solidiore ; crassissima, sculptura valde 

 impressa; anfr. norm, v., parum rotundatis, suturis distinetis ; 

 costis radiantibus t. juniore circ. xii., obtusis, parum expressis, 

 postea obsoletis; liris spiralibus validis, crebris (quarum t. juniore 

 v., postea X., in spira monstrantur), subeequalibus, aiiticis maiori- 

 324 



