584 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
(?) Rhynchocamara varians (Billings) TWENHOFEL and WHITING, Geol. Soc. Amer. Special 
Pap. II, p. 53, pl. 7, figs. 19-21, 1938. 
The type lot of this species consists of two specimens: a fairly large one and 
a smaller one. The former has the length and width about equal; apical angle 
about 90° and the valves subequal in depth, the brachial valve somewhat deeper 
than the pedicle one. The sulcus is moderately wide but with a short tongue. 
The sulcus originates at about the middle and is occupied by 3 moderately strong 
costae that do not extend posteriorly as far as the place of origin of the sulcus. 
One or two short and faint costae occupy the flanks. The brachial valve has a 
low fold originating anterior to the middle and marked by 4 short costae. The 
flanks are marked by 1 or 2 indistinct costae. The brachial valve is moderately 
swollen and moderately convex in lateral profile. This specimen (G.S.C. 1038) 
is selected as the type of the species. 
The second specimen is smaller and more elongate and has only 2 costae in 
the sulcus and 3 on the fold. It is probably a young form of the species, but not 
enough specimens of C. varians have ever been collected to make possible a study 
of its variation. 
Types.—Lectotype: G.S.C. 1038; figured paratype: G.S.C. 1038a; figured 
hypotype: 111163; Y.P.M. 15284. 
Horizon and locality—Lower half of the Mingan formation in the Mingan 
Islands: St. Lawrence River on Parroquet, Eskimo, Bald, Mingan, and Nia- 
pisca Islands and on Clearwater Point. Twenhofel and Whiting’s specimen is 
from Eskimo Island. Twenhofel states that the species is common only on 
Mingan Island. It is not possible to tell from the description whether or not more 
than one species is included in the collections. 
Crown Point formation in New York: On Valcour Island, Lake Champlain, 
Plattsburg (15’) Quadrangle. 
Discussion.—Camerella varians has been fairly widely identified in rocks 
hitherto classified as Chazyan. The references to this species in the Table Head 
series of Newfoundland are probably wrong. The species is said to come from 
East Tennessee, but several specimens from that area so referred are here as- 
signed to the new species C. triangulata. Specimens from the Crown Point lime- 
stone near Chazy identified by Dr. P. E. Raymond are also referred to a new 
species (C. ventricosa). The Mingan specimens and a few from the New York 
Chazy rocks are believed to belong to C. varians. See the above-mentioned 
species for comparisons. 
CAMERELLA VENTRICOSA Cooper, new species 
Plate 110, G, figures 36-49 
Camarella varians RayMonp, (not Billings), Ann. Carnegie Mus., vol. 7, p. 250, pl. 36, 
figs. 19-23 (not 24-28), 33-36 (doubtful), 1911. 
Shell variable, generally somewhat broadly triangular to subpentagonal in out- 
line ; length equal to, greater than, or less than the width; apical angle varying 
from 75° to about 100° ; paucicostate, the posterior half generally smooth but the 
