210 PROCEEDINGS OF THE CALIFORNIA 



extantibus, crebrioribus eleganter exasperata ; iutus, dent. card, validioribus, lat. 

 subdistantibus ; cic. adduct. ovalibus, baud impressis. 



Long. 0-51, lat, 048, alt. 0-34. 



Hab. (modestum.) Quelpart Island, Cbina Seas, and Japan ; A. Adams. 



(Centifilosum) Monterey, 20 fins, alive ; Santa Barbara 1, Catalina Island, 

 40 fm. Cooper. 



Rounder than C. modestum, Ad. $ Rve., with fewer and sharper ribs ; but 

 the Eastern shells vary, and Mr. Adams considers them conspecific. 



Genus Lepton, Turton. 

 Lepton meroeum, Cpr. n. s. 

 L. t. parvfi, subplanata, Meroa>formi ; transversa, marginibus omnino excur- 

 vatis; antice valde producta; umbonibus acutis, prominentibus; dent. card, 

 (v. sinistr.) uno, celato ; lat. ant. prominente, post, subobsoleto ; fossa cartila- 

 ginali angusta ; cic. adduct. remotis. 

 Long. 0-11, lat. 0-08, alt. 003. 

 Hab. San Diego, 1 broken valve among shell washings. Cooper. 



Genus Pristiphora. Cpr.* n. g. 

 Syn. Pristes, Cpr. Rep. Brit. Ass. 1864, (pre-occupied.) 

 Testa " Tellimyce Adamsiorum" similis ; dentibus cardinalibus nullis; late- 

 ralibus utraque valva conspicuis, postice elongatis, antice curtioribus, cardinem 

 versus transversim sulcatis ; fossa cartilaginaii inter eos sita. 



Pristiphora oblonga, Cpr. n. s. 



P. t. oblonga, parva, subquadrata, valde inrcquilaterali ; parte antica fere 

 nulla ; marginibus, dorsalibus subrectis, fere rectangulatis, ventrali parum ex- 

 curvato, postico rotundato ; umbonibus antice flectis ; lunula parva, concava : 

 intus, v. sinistr., dent. lat. post, per totam longitudinem dorsalem decurrente, 

 parte cardinali acuta, alte transversim sulcata ; ant. secundum lunulam incur- 

 vato curto, serrato ; cicatr. adduct. sub fines dentium sitis. 



Long. 0-14, lat. 0-10, alt. 000. 



Hab. San Diego ; 1 worn valve among shell washings. Cooper. 



Genus Leda, Schumacher. 

 Leda hamata, Cpr. n. s. State Collection, No. 984. 

 L. t. " L. taudata, " simili, sed valde hamata ; plauata, valde insequilaterali ; 

 umbonibus angustioribus, lasvibus, ad trientem sitis ; marginibus, dors. post, max- 

 ime incurvato, ant. parum, ventr. valde excurvatis ; parte postica valde rostrata, 

 rostro biangulato, curvato, angustiore, biangulata ; sulcis et costis validis, con- 

 centricis, supra rostrum continuis, dorsum versus postice obsoletis. 

 Long. 0-37, lat. 0-10, alt. 0L0. 



* From the Greek for a sawyer ; from the serration of the teeth, which is unique in the 

 family. 



