24 DR. P, p. CARPENTER ON THE SHELLS OF PANAMA. 



371. ? rnfeUa, pp. ind. This has the general appearance of P. 

 vuUjuta, but may be an Acmcua. 



3/2. Chiton cJathrdlus. (Genus indet.) 



3/3. Chiton dispar, C. B. Ad.; not Lophyrvs dispar. Shy. I 

 doubt whether any of the Professor's specimens belong to Sowerby's 

 species, which is black mixed with grey ; area-sculpture very faint ; 

 and sides imbricated, not rugulose. Among the du[)licates were two 

 ( if not three) species : — the principal one with side -sculpture in lobated 

 knobs, which may be named Lophyriis ada?nsii; a ?variety with 

 simple knobs; and a well-marked species without distinct side areas, 

 which may be called Lophyrus teimiscidptus. 



374. Chiton lluridus. Probably correct. 



375. Chiton puIcheIlus=Cal/.ochiton p. + C. elenensis. 



376. Chiton stokesii=^ Lophyrus s. 



?>n. Anomia lampe, C. B. Ad. It is doubtful whether this 13 

 identical with the northern species, M. 219. 



378. Anomia tenuis. This is probably the young of the last 

 species, and may give it a name, if new. It is doubtful how the 

 diagnosis of the scars was made out ; as they were not visible iu 

 either of the specimens retained, being encrusted with dead animal 

 matter. They were not distinct even after its removal. 



379. Anomia, sp. ind. a. Probably the same species as the two 

 last, although far too dead, worn, and young to decide. See notes 

 on the variations of A. lampe, Maz. Cat. p. 168. 



380. Ostrea, sp. ind. a. The hinge notches of the upper valve 

 fit between corresponding teeth in the lower. Inside rather flesh- 

 coloured ; white, round margin. Scar kidney-shaped, dark in one 

 valve, light in the other. A young valve is white, and as pearly as 

 O. iridescens, M. 211. The species is best known by its tendency 

 to make a very broad limb in the exterior coloured part, spreading 

 out into palmations. A very young specimen, though covered above 

 with MembraniporcB, shows the characteristic corrugations through. 

 It may stand provisionally as O. panatnensis. 



381. Ostrea, sp. ind. b. This is probably a variety oi O. pana- 

 wensis, but more coarsely grown, so that there is a smaller limb, 

 without ])alinations. Wherever the sculpture appears, there are evi- 

 dent traces of the peculiar corrugations. The inside has the same 

 characters, both of hinge, colour, iridescence, and scar. 



382. Ostrea, sp. ind. c. Rather square hinge, without plications ; 

 one shell with an umbonal cavity. Pearly white. One specimen is 

 tinted on the scar, which may become coloured in the adult. It is 

 by no means "pentangular," and is more probably = 0. rii/a, Gld., 

 than O. columbiensis, M. 213. 



383. Ostrea, sp. ind. d. The shells are broader than the Mazatlan 

 specimens of O. viryinica, INT. 212, prohablv from not growing on 

 twigs. The younger shells are very like 0. edulis ; the older ones 



198 



