No. 7.— NEW FOSSILS FROM THE CHAPMAN 
SANDSTONE. 
BY PERCY E. RAYMOND. 
A SMALL collection lately acquired by the Boston Society of 
Natural History from Mr. Olof O. Nylander, contains two fossils 
which were recognized as new by the collector, and which Dr. 
Edward Wigglesworth has been good enough to turn over to me 
for study. Although Clarke (1909), and later Wilhams and 
Breger (1916), have made known a very considerable fauna from 
material collected by Mr. Nylander, the success which rewards 
the continued efforts of that enthusiastic naturalist indicates 
that the Chapman sandstone still holds much that will contribute 
to our knowledge of the life of New England in Lower Devonian 
times. 
The first of these new fossils is a well-preserved cast of the 
interior of a shell which appears to be the same species as one 
which Clarke figured as Rensselaeria sp., and the other is a crani- 
dium of a Calymene, the first representative of the genus to be 
reported from the Devonian of Maine. 
Family Centronellidae Hall and Clarke. 
Subfamily Rensselaeriinae, nov. 
The families of the Telotremata are distinguished from one 
another by the type of support which carries the brachia. The 
present family takes its name from a genus which differs from 
most of the other members of the family in having a smooth 
shell, and is further peculiar in having a wide and pronounced 
sinus in the brachial valve. In view of the predominence of 
biconvex, plicated shells like Rensselaeria and its allies, it would 
seem advantageous to make a subfamily Centronellinae, for such 
genera as are allied to Centronella, and another, the Rensselaer- 
iinae, for the dominant group. 
Prorensselaeria, gen. nov. 
It is proposed to include in this genus those Rensselaeriinae 
which retain to adulthood the primitive characteristics of possess* 
4G7 
