40 TALEOIS'TOLOGY OF NEW JEKSEY. 



Geuus LITHOI'HAGA Boltcii. 



LlTHOPHAGA SUBALVEATA. 

 PI. V, tig. 9. 



Lithophaga xuhalveata Courad: Aui. Jour. Conch. , vol. 2, p. 73, PI. iv, fig 4. 

 Lithodomus subalveatus Heilpriu : Proc. Acad. Nat. Sci. Phil., 1887, pp. 397 and 40-'. 



"Oblong, very tliiii and fragile, ventricose, posterior side jn-oduced, a 

 slight wide furrow marks the lunbonal slope, on and l^ehind which are con- 

 centric grooves and lines; basal line slightly eniarginate or contracted." 

 (Conrad, oj). cit.). 



This is one of the few species described from New Jersey which I 

 have not personally seen. Mr. Com-ad says that " a single specimen was 

 found i)enetrating the shell of Ostrca pcnra.'isa, C!onrad." And Prof Heil- 

 prin cites, in one of his lists, a form of Lithodonuis sp. 1 1 have seen a 

 few of the cavities in 0. percrassa Conrad, from 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, cojjied Mr. Conratl's 

 figures of the species. 



Locality: Mr. Conrad gives "Shiloli, (_!uniberland County, N. J.," as 

 the locality. 



HOMOMYARIA. 



Family ARGID^E. 



Genus STRIAIIGA Comad. 



Striarca Conrad : Proc. Acad. Nat. Sci. Phila., 1862, p. 290. 



Mr. Conrad describe.s the genus in the following language: " Equi valve, 

 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." Area 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 Arcidse ; the plaits are hollow with 

 parallel laminar sides." 



