2 Pandora obtusa, Lam., auct. 



3. Pandora brkvifrons, Sby., Sp. Conch, f. 25, 26; P. Z. S. 

 1835, p. 93. 



4. Pandora cistula, Gld. Otia, p. 77. 



This species is not quoted in the index to the E. E. Moll., but 

 appears in the text (p. 39()) and in the Atlas (f. 500). In shape, 

 but not in texture, it resembles P. oblonga. 



5. Pandora oblonga, Sby., Sp. Conch f. 10; Hani. Rec. Shells, 

 p. 49. 



The unique type of this species, from Humphrey's collection, has 

 not been found ; it was not described in the P. Z. S., and very closely 

 resembles P. rostrata. 



6. Pandora radiata, Sby., P. Z. S. 1835, p. 24; Sp. Conch. 

 f. 23, 24. 



7. Pandora wardiana, A. Ad. P. Z. S. 1859, p. 487. 



No ossicle has been observed in any of the above species. If it he 

 found hereafter in living; specimens of the grooved P. radiata and 

 P. wardiana, they should be removed to the subgenus. The g-roup 

 is not local, as appears to be the case with CoeloiJon and Cltt/ /tora, 

 being found in both hemispheres and on both sides of the ei^uator. 



Subgenus Kennerlia*. 



Pandora cartilagine ossiculo tenuiore instructa ; lamina extC' 

 riore prismatica valvee pfanata radiis plerumque insculpta. 



The ty{)ical species have radiating grooves in the exterior prismatic 

 layer of the right valve. These have not been observed in K. glu- 

 cialis, but perhaps the specimens are somewhat decorticated. The 

 essential character is the possession of an ossicle. This is well deve- 

 loped in K. fflacialis, but so thin in the other species that it is often 

 hidden in dried shells by the contraction of the cartilage. The first 

 species in which it was observed (Dr. Kennerley having sent several 

 fresh specimens, preserved iu alcohol, to the Smithsonian Institu- 

 tion) was 



1. Kennerlia filosa, n. s. 



K. t. tenui, planoconvexa, maxime rostrata ; marginibus dorsa- 

 libus rectis, ad angulum circ. 1()0°; ventrali regiilariter et 

 modice excurvato, postice vix sinuato ; epidermide ohvacea, 

 2)lerumque erosa, postice corrvgata ; lamina externa prismatica 

 spongiosa ; valva planata radiutim sulcata (quasi Jilosa), sulc is 

 distantibus; valva convexa, costa obtusissima postice decurrente ; 



• Named in grateful remembrance of the services rendered to science by the 

 late Dr. Kennerley, the naturalist to the American N. Pacific Bouiulary Survey ; 

 whose premature death has interrupted, almost at the uuset, our kuuvviedge of 

 the dreilging-tauna of I'uget Sound 



231 



