595 DR. P. P, CARPENTER ON THE PANDORID#&. [Nov. 22, 
display faint radiating grooves on the prismatic layer of the flat valve, 
as in Kennerlia. 
4, CyipiopHoRA PUNCTATA, Conr. 
This very rare species was only known in England by worn left 
valves in the British Museum, andin Mr. Cuming’s and Mr. Hanley’s 
collections. The first perfect specimens were dredged by Dr. J. G. 
Cooper (Zoologist to the Californian State Survey) at San Pedro. 
A young shell, sent by him to the Smithsonian Institution, displays 
a dentition agreeiug in the main with C. ¢rilineata. In the flat 
valve, the central and anterior teeth are close together and nearly 
parallel ; the anterior short, nearly obsolete ; the middle long and 
sharp, corresponding with the long, sharp tooth in the convex valve, 
which points to the outside of the anterior scar, instead of to the 
middle, as in C. trilineata. The (posterior) clavicle-tooth in the flat 
valve is longer than in the Eastern species, with the cartilage on it 
for two-fifths of the length. In C. ¢rilineata it lies by the side, nearly 
the whole way. The posterior margin of the convex valve fits between 
the clavicle and the margin of the flat valve. The ossicle is remark- 
ably long and thin. The punctures are extremely conspicuous even 
in this young, transparent, and papyraceous specimen ; and, what is 
more peculiar, the dried remains of the animal are covered with 
minute pearl-shaped grains of shelly matter corresponding with them. 
4a, CLIDIOPHORA DEPRESSA, Sby.,=Pandora d., Sp. Conch. f. 
11, 12; Hanl. Rec. Shells, p. 49. 
The “‘posterior’’ dilated side of Sowerby is the “anterior” of 
Hanley. The species was constituted from a “‘very few specimens, 
all of them much worn down, as if they had been used as ornaments.” 
The hinge therefore may not have been accurately observed. They 
were part of the Humphrey collection, and perhaps from the Califor- 
nian region. Judging from the shape (for no type has been disco- 
vered), it may be identical with C. punctata, Conr. 
5. CLIDIOPHORA ACUTEDENTATA (vice C. B. Ad.). 
C. ¢. parum “ elongata, ovata; parte postica”’ haud rostrata, 
latiore, obtusa; “margine dorsali”’ postico “subrecto; margine 
ventrali rotundato,’ haud tumente; parte antica curtiore ; 
“umbonibus subaqualiter subconvexis, umbone dextro postice 
angulato”’: intus, v. convexa dente antico magno, acutissimo, 
medio parvo, postico vatido, maxime elongato ; v. planata den- 
tibus antico et postico aculis ; ligamento juxta dentem posticum 
sito. 
** Long. /*7slatus425 alts" 1lypoll.” 
flab. in Panama: sp. unicum, postice fractum, legit C. B. Adams 
deploratus : Museo Coll. Amherstianze := Pandora cornuta (Gld.), 
C. B. Ad. Pan. Shells, no. 498, P.Z.S. 1863, p. 368. 
Prof. Adams’s “‘ appropriate name suggested by Dr. Gould” being 
calculated to mislead, I have thought it necessary to change it. 
