26 
MUSEUM BULLETIN NO. 3. 
Genus, Triplegia Hall. 
Triplecia insularis var. anticqstiensis new variety. 
1871. Orthis insularis Davidson, Mon. Brit. Foss. Brach., vol. iii, pt. vii, 
p. 273, pi. xxxvii, figs. 8-15. 
1910. Triplecia ortoni Schuchert and Twenhofel, Bull. Geol. Soc. Am., vol. 
21, p. 710. 
The discovery of this somewhat widely ranging north 
European species, in the lowest Clinton deposits of the Anticosti 
section, is a matter of considerable interest, since it has not 
previously been definitely recognized in America although its 
probable presence in the Anticosti rocks was mentioned by 
Davidson. It is somewhat larger than the European form and 
has a deeper ventral sinus. 
Horizon and Locality. Silurian; Gun River (5), about a 
mile west of Jupiter River; Jupiter River (3), Jupiter river. 
The holotype and plesiotypes are in Peabody Museum. 
Genus, Chonetes Fisher. 
Chonetes (Eodevonaria) primigenius new species. 
(Plate I, figures 4-5). 
The shell of this new species closely resembles that of 
Brachyprion leda (Billings) and was at first mistaken for that 
species. Hinge line greatest width, average 9 to 12 mm., average 
length 6 to 8 mm. Ventral valve moderately convex, but not 
nearly so much so as in Plectambonites. In the Ellis Bay forma- 
tion specimens were found attached by the dorsal valve to 
the shells of other brachiopods, but whether this has any signifi- 
cance or not is unknown. There are four small spines on 
each side of the beak. The surface of each valve is covered 
with numerous fine striEe — -about one hundred and fifty to each 
valve — and in the centre of the ventral valve is a single striation 
very much stronger than any other, such as occurs in Leptaena? 
nitens t whose ventral interior that of this shell also closely re- 
sembles. The hinge area is striated as in Brachyprion leda. 
The dorsal interior is not known. 
