lineis sen uncJis hicrementi conspicuis : infus dente canlinaJi 

 vno, parvo, extante ; callositate clavicxiloidea a7itica, maryini 

 contigua ; fossa cartUayinea postice sita ; cicatricibus athiuc- 

 tonnn rotundatis, maryini dorsali contiguis ; linea pallii sini' 

 plici. 



Long. -8, lat. -4, alt. -12 poll. 



Hab. ia sinu Pugetiano (Kennerlei/"), 



2. Kennerlia bicarinata, n. s. 



K. t. " K. filosse " simili, sed hand rostrata ; postice latiore $ 

 carhiis in valva convexa dnabus, in valva planata una, ex umbO' 

 nibus postice decurrentibus ; lamina prisma tic a radiatim sul- 

 cata, haud sponyiosa ; valva convexa tenuiter indentata ; liga- 

 mento elonyato, teniiissimo. 

 Long. •.'), lat. •2.5, alt. '06 poll. 



Hab. in insula Catalina, Californise ; 40-60 uln., rara (J)r. J. G. 

 Cooper. State Geological Survey Coll. no. 1063 ; Mus. Smithsonian 

 Inst.). 



The shape and keels at once distinguish this beautiful little species 

 from its Northern ally, with which, in the hinge and threading of 

 the outer layer, it exactly agrees. The ligament in both species is 

 extremely thin, holding the valves together from the umbo to the 

 posterior end. The fossil Pandora bilirata, Conr., may prove iden- 

 tical with this recent species ; but the diagnosis, figure, and type 

 specimen are so imperfect that it would be too hazardous to affiliate 

 them. 



3. Kknnerlia glacialis. Leach {Pandora yl.), Sby. Sp. Conch. 

 f. 4, 5, 6 ; Hani. Rec. Shells, p. 49 (diagn. auct.). 



. , .valva dextra callo conspicuo fossam cartilayineam Jirmante; 

 ossiculo fortiore. 



The known species of Kennerlia are thus confined to the North 

 Pacific and the Arctic seas. The diagnosis of No. 1 belongs to a 

 paper on Dr. Kennerley's new species in the Journ. Ac. N. S. Philad. ; 

 and that of No. 2 to a series of papers on Dr. Cooper's new species 

 in the Proc. Calif. Ac. N. S. They are inserted here to complete 

 the monograph, as far as known to the writer. The " Pandova 

 striata, Quoy" (Add, Gen. ii. p. 371), is a Myodora. The latter 

 geuus is so well defined that no alteration is proposed in it, 



232 



