4 . Dr. P. P. Carpenter on Pleistocene Fossils 



seriehus, a sutnris separatis, spiram ascendentibus ; t. adulta, 

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

 bus creberrimis ; costis suturalibus ii. validis, hand nodosis ; basi 

 effusa, liris circ. vi. ornata ; apertura subquadrata; labro labioque 

 tenuibus ; columella vix torsa, effusa, vix emarginata. 



Hab. Sta. Barbara, Pleistocene, 1 sp. [Jeivett). S. Pedro, 

 S. Diego {Cooper). 



The sculpture resembles Cerithiopsis ', but the columella is 

 pinched, not notched. 



Opalia {^.crenatoides, var.) insculpta. 



O. testa O. crenatoidei simili ; sed costis radiantibus pluribiis, xiii.- 

 xvi., in spira validis; anir. ult. obsolctis ; scul])tura 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 0. crenatoides, now living at Cape 

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

 quite possible that the three forms had a common origin. 



Trophon tenmsculptus. 



T. testa T. Barvicensi simili, sed scul|)tura minus cxtante ; vertice 

 Ducleoso minimu ; anfractibus uno et dnnidio Isevibus, apice acuto; 

 normaliljus v., tumidis, postice svibangvilatis, suturis iinpresbis ; 

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

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

 spira monstrantur, aliis intercalantibus, supra costas radiantts 

 undatim transeuntibus ; tola su])eiiicie lirulis incrementi, suj)ra 

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

 recta, vix clausa ; labro acutiore, postice et intus incra!^sato, denti- 

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



Hnb. Sta. Barbara, Pleistocene formation {Jeivett). 



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

 T. Barvicensis, from M'hich it appears to differ in its extremely 

 small nucleus. It is very closely related to T.Jimbria talus, 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 btiug 

 a slight columellar twist, as in Peristernia. 



Pisania fortis. 



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

 impressa ; ant'r. norm, v., parum rotundatis, suturis distinctis ; 

 costis radiantibus t. juniore circ. xii., obtusis, parvmi exj)ressis, 

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

 v., postea X., in spira monstrantur), subeequalibus, anticis majuri- 

 324 



