40 PALEONTOLOGY OF NEW JERSEY. 
Genus LITHOPHAGA Bolten. 
LITHOPHAGA SUBALVEATA. 
Piva ea: 
Lithophaga subalveata Conrad: Am. Jour. Conch., vol. 2, p. 73, Pl. rv, fig 4. 
Lithodomus subalveatus Heilprin: Proc. Acad. Nat. Sci. Phil., 1887, pp. 397 and 402. 
‘Oblong, very thin and fragile, ventricose, posterior side produced, a 
slight wide furrow marks the umbonal slope, on and behind which are con- 
centric grooves and lines; basal line slightly emarginate or contracted.” 
(Conrad, op. cit.). 
This is one of the few species described from New Jersey which I 
have not personally seen. Mr. Conrad says that ‘a single specimen was 
found. penetrating the shell of Ostrea percrassa, Conrad.” And Prof. Heil- 
prin cites, in one of his lists, a form of Lithodomus sp.?. I have seen a 
few of the cavities in O. percrassa Conrad, trom New Jersey, which I sup- 
pose may have been the burrows of this species, but no shells were in 
them. Consequently I have, in this case as in others, copied Mr. Conrad’s 
figures of the species. 
Locality: My. Conrad gives ‘Shiloh, Cumberland County, N. J.,” as 
the locality. 
HOMOMYARIA. 
Family ARCID2. 
Genus STRIARCA Conrad. 
Striarca Conrad: Proc. Acad. Nat. Sci. Phila., 1862, p. 290, 
Mr. Conrad describes the genus in the following language: ‘“ Equivalve, 
radiately striate, closed; hinge area transversely striated, and also the epi- 
dermis above it; hinge line dilated and curved at the ends; teeth divided 
into oblique hollow cross plaits.” Ayca centenaria Say, is mentioned as the 
type. He further states that “the remarkable teeth of this genus dis- 
tinguishes it from all other genera of the Arcidee; the plaits are hollow with 
parallel laminar sides.” 
