21 AlvDRICH, EOCKNE MOLLUSCA 



in the other ; a longer tooth below. Three single valves in the 

 collection. lycugth 8 mm. ; height about 7 mm. 



Locality. — Gregg's and Bell's I^andings, Ala. River, Ala. 



Type. — In Ala. Museum. 



Remarks. — This species is doubtfully placed in Basterotia ; 

 the large gap suggests an attachment to some other form, but is 

 not irregular. Prof. Dall has kindly examined it, and suggests 

 that it might be commensal. 



Saxicavellaalabamensis, n. sp. PI. 3- Figs- 4> 5- 



Shell inequivalve ; thin ; posterior much broader than the 

 anterior ; outer surface showing irregular lines of growth, 

 stronger over the umbonal slope ; an upright cardinal tooth 

 directly under the umbo, with a short lateral on posterior side in 

 the right valve ; anterior muscular impression distinct ; pallial 

 line faint. Only one valve in the collection. Length 6 mm. ; 

 height 43^ mm. 



LocoJity. — Bell's Ivanding, Monroe Co., Ala. 

 Type. — -In Ala. Museum. 



R^ontacuia Herberts, n. sp. PI. 3- Figs- 6, 7- 



Shell sm.all ; inequilateral ; dorsal and ventral margins 

 rounded ; each end rather blunt ; the posterior somewhat 

 angulated ; surface smooth with very fine concentric striations, 

 and a few lines of growth near the ventral margin ; shell inflat- 

 ed ; cardinals feeble, showing in left valve only ; beaks low, 

 rather pointed, a small buttress under them. Ivcngth 9 mm ; 

 height 6%' mm. 



Locality. — Cave Branch, Ala. 



Type. — Ala. Museum of Nat. History. 



Remarks. — -One valve in ni}^ collection. Named in honor of 

 the late Herbert H. Smith. 

 Ervilia lignittca, n. sp. PI. 3. Figs. 8, 9. 



Shell small, inflated ; nearly inequilateral ; rather solid ; 

 the posterior slightly longer than the anterior ; both ends round- 

 ed ; surface carrying a few irregularly spaced grooves of growth; 

 interior polished, shining ; pallial sinus small, not reaching to 



