lineis seu undis inerementi conspicuis : intus dente cardmali 

 uno, parvo, extante ; callositate claviculoidea antica, margini 

 contigua ; fossa eartilaginea postiee sita ; cicatricibus addue- 

 torum. rotundatis, margini dorsali contiguis ; linea pallii sim- 

 plici. 



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



Hab. in sinu Pugetiano (^Kennerley). 



2. Kennerlia bicarinata, n. s. 



K. t. " K. filosse " simili, sed Jiaud rostrata; postiee latiore } 

 carinis in valva convexa duabus, in valva planata una, ex umbo- 

 nibus postiee decurrentibus ; lamina prismatica radiatim sul- 

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

 mento elongato, tenuissimo. 

 Long. ■,5, lat. "25, alt. '06 poll. 



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

 Cooper. State Geological Survey Coll. no. 1063 ; Mas. 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 (Pandoragl.), Sby. Sp. Conch, 

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



. . .valva dexira callo conspicuo fossam cartilagineam firmantei 

 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 " Pandot-a 

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

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



232 



