lineis sen undis incrementi conxpiriiis : intus dente carihnaJi 

 una, parvo, extante ; callositate claviculoidea antica, mari/iiii 

 contiyua ; fosxa (:artila(jiiiea posfice sita ; cicatricif/iis addnc- 

 torum rotundatis, maryini dursali contiyuis ; liaea j^allii sijn- 

 plici. 



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



Hub. in sinu Pugctiano (^Kennerlei/'). 



2. Kennerlia bicarinata, n. s. 



K. f. " K. filosse " simili, sed haud rostrata ; posfice fafiore f 

 caririis in valvn convexa duabus, in valva plannta una, ex umbo- 

 nibus posfice decurrentibus ; lan'ina prisma fica radiatiin sul~ 

 cafa, hatid sponyiosa ; valca C( vexa tenuiter indentata ; liya- 

 menfo elunyato, fenuissimo. 

 Long. •."), lat. "In, alt. '06 poll. 



Ilab. in insula Catalina, Califomioe ; 40-60 uln., rara {Dr. J. G. 

 Cooper. State Geological Survey Coll. no. 10()3; 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 bilirufa, 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 .ffiliate 

 them. 



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

 f. 4, 5, 6 ; Ilanl. Rec. Shells, p. 49 (diagu. auct.). 



. . .valva dextra callo conspicuo fossam cartilagineam firmante i 

 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 ar» inserted here to complete 

 the monograph, as far as known to the writer. The " Pando-^a 

 striata, Quoy" (Add. Gen. ii. p. 3/1), i3 a Myodora. The Iixtter 

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



232 



