DR. P. P. CARPENTER ON THE SHELLS OF PANAMA. -0 



have hollow umbos. One long shell, first marked e, bnt altered to d, 

 is the adult form ; several of the younger shells are doubtful. 



384. Ostrea, sp.ind. e. = Ostrea, M. 21.o. Beuig a good species, 

 I propose the name of O. amuru. The Professor's " small var." is 

 not plicated, and appears to belong to O. conchnphUa, M. 21-4. 

 [N.B. Additional specimens confirm me in tne belief that O. jjul- 

 mula, M. 214 6, is a distinct species.] 



38.5. Spondylus lamarckii, C.-B. Ad. = 5'. cakifer, M. 208. 



386. Spondylus, sp. ind. a = Plicatula peuicUlata, M. 210. 



387. Pecten inca = P. ventricosus, Shy., as in errata. 



388. Pecten iumbezensis=P. aspersus, Shy., Haid. (? Lam.). 



389. Lima avgvlata. Shells inflated, not gaping. 



390. Lima pacifica (=L. arcuata, Shy., Hani.). Young shells, 

 species uncertain. 



391. Acicula 1margaritifera = Mar(jariti])hora fimhriata, Dkr., 

 M. 204 = 3/. mazatlanica, IIanl. = 3i. barhata, Rve. 



392. Acicula sterna, M. 203. A. libella, Rve., appears to me 

 the young of this species. 



393. Pei-na, sp. ind. a = Isognomon chemnitziana, M. 205. 



394. Perna, sp. ind. b = I. chemnitziana, var. Rather more 

 finely grown, and with less colour, but certainly the same species. 

 The Professor's Jamaica specimens are labelled " bicolor, Ad." 



395. Pinna maura, M. 200. 



396. P'nna tuberculosa. Thi*ee of the specimens appear to me 

 ^P. maura, jun. The other may be the same, but is worn nearly 

 smooth. 



397. Mytilus, sp. ind. a. Resembles the young of 3Iodiola bra- 

 siliensis, but with a few hinge- teeth, as in 31. edulis. 



398. Lithodomus, sp. ind. a. Most of these specimens are of 

 Lithop/iai/us aristutus, M. 176 ; one (perhaps two) are L. attenua- 

 tus, M. 173 (which is found from Lower California to Chili) ; and 

 one appears to be L. plumula, M. 175 ; but they are too young to 

 decide with confidence. 



399. Modiola 1 setnifusca. These specimens all belong to the M, 

 brasiliensis, M. 171, but are much more like the ordinary Brazilian 

 specimens than are those from Mazatlan. As compared with the 

 latter, the Panama shells are more rounded, with stronger posterior 

 grooving, and with the angular ridge less marked. A similar shell, 

 undoubtedly from New Zealand, is considered by Mr. Cuming con- 

 specific. 



400-404. Modiola, sp. ind. a, b, c, d, e. I could find no « or <? 

 in the collection; but there were two trays marked /". Tray b^^M. 

 ccpux, AL 170. c contains several specimens of 3Iyfilns mulfi/ormis, 

 IM.. 1G8, strongly ribbed variety, perhaps intended for b, no. 401. 



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