54 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
A. X. S., Phil., July 1865, p. 123) and also less tumid around the 
margins, besides being much more distinctly striate. 
"Though I am not positive of the general relations of this species, 
it appears to be congeneric with C. AUei. These species are both 
ornamented with beautiful terebratuloid punctations, and both exhibit 
the elongated ribbon-like muscular markings on the ventral valve 
which also characterize the well-determined species C. Julia. In one 
of the specimens referred (pro%isionally) to Cf Flora, there is a low, 
but elongated median septum in the dorsal valve, from which, near the 
beak, proceeds, on each side, a thin horizontal, longitudinal plate, 
reaching half the length of the septum. In the ventral valve, the dental 
lamellae are feebly developed, and, instead of reaching the inner sur- 
face of the valve, they curve toward the median line and join each 
other, leaving a small space between the transverse septum thus 
formed and the surface of the valve — being thus a kind of shoe-lifter 
septum inverted,— or, more strictly, a trough-like plate, as in Camaro- 
phoria, but not, like that, supported by a median vertical plate. It is 
worthy of consideration whether these distinctive characters are not 
of generic importance. The structure noticed in this specimen con- 
nects Pentamerus with Tcrebratula, as Caviarophoria connects Penta- 
merns with Rhynchonella. I reserve the subject for further study. 
"From bed No. 4, Sciotoville, Ohio." 
Of the characters mentioned in Winch ell's formal description, 
every one, except that of the surface of the shell, refers to Cranaena 
suhelliptica. The latter is not longitudinally striate but Camarophor- 
ella is. The dimensions are those of the Cranaena which is invari- 
ably longer than broad in about the proportions named. This is 
rarely true of Camarophorella which is almost always broader than 
long (see measurements given above on ]>age 39). Cranaena is 
punctate and possesses the "elongated ribbon-like muscular mark- 
ings on the ventral valve" mentioned in his additional notes. Cama- 
rophorella is not punctate and the muscles are inserted on platforms, 
none of them being attached directly to the inner surface of the valve. 
On the other hand, the internal structures described as occurring 
"in one of the specimens referred (provisionalb/ ^) to C? Flora" are, 
without any possible doubt those found in Camarophorella. "With 
the exception of the structures occurring in this last mentioned speci- 
men and the radiating striae on the surface, the description through- 
i Italics are the present %Yriter's. 
