lineis sen undis incrementi conspicuis : intus dente cardinali 

 uno, parvo, extante ; callositate claviculoidea antica, maryini 

 contigua ; fossa cartilayinea postice sita ; cicatricibus adduc- 

 torum rotundatis, margini dorsali contiguis ; linea pallii sim- 

 plici. 



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



Hab. in sinu Pugetiano (Kennerley). 



2. KENNERLTA BICARINATA, n. s. 



K. t. " K. filosee " simili, sed hand rostrata ; postice latiore / 

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

 nibus postice decurrentibus ; lamina prismatic a radiatim sul- 

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

 mento elongate, tenuissimo. 

 Long. -5, lat. '25, alt. '06 poll. 



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

 Cooper. State Geological Survey Coll. no. 1063 ; M us. Smithsonian 

 Inst.). 



The shape and keels at once distinguish this heautiful 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 idea* 

 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 gl.}, Sby. Sp. Conch. 

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



. , .valva dextra callo conspicuo fossam cartilagineam 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 "Pandora 

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

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



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