166 PROCEEDINGS OP THE ACADEMY OP 



l^enus is founded on a shell which inhabits Sacramento Riyer, California. Per- 

 haps Anodonta angulata^ Lea, may be included in this genus. 



CALYPTRAPHORUS. 



Shell subfusiform; spire acutely rostrated; beak straight, very slender; 

 labrum with a sinus at summit and base, elsewhere entire ; a calcareous de- 

 posit covers the entire shell within and without. 



Allied to Rostellaria, Lam. 



1. Calyptraphorus vblatus. (Restellaria) Con. Tert. Fossils, p. 38, pi. 15, 

 fig. 4. 



2. C. TKiNODiFERUs. 71. 5. Subfusiform, with three distant nodes on the upper 

 part of the body volution ; spire subtriangular, having curved longitudinal ribs 

 visible beneath the tunic ; rostrum of the spire elongated and curved ; labrum 

 with a prominent angle above. 



From the Eocene of Alabama. Mr. Showalter. 



This genus at present is known only in Eocene deposits. 



Bectification of some of the generic names of American Tertiary Fossils. 



BY T. A. CONRAD. 



RIMELLA, Agaz. 



R. LAQtTEATA, Con. (ROSTELLARIA.) 



ANAULAX, Roissy. 

 A. STAMiNEA, Con. (Olivula.) 



AXINiEA, Poll. 



A FiLOSA, Con. Inadvertently referred to Glossus in the Proceedings and in 

 Wailes' Geology of Miss. 



DIPLODONTA, Phillipi. 



D. ACCLiNis, Con., ELEVATA, Con., in the Miocene ; ungulina, Nitens inflata in 

 the Eocene. (Mysia, Loripes, Lucina, inadvertently Cyclas.) 



JANIRA, Schum. 



J. Hcmphreysii, Con., J. Poulsoni. (Pecten.) Referred also to Neithea, but 

 in my opinion that genus should be restricted to the Cretaceous forms of which 

 iV. quinquecostata is the type. 



BUSYCON, Botton. 



In the Proceed. 1854, p. 30, the above is printed Busyeon, a typographical 

 error copied from Gray's Synopsis. 



Description of a new species of MTACITES. 



BY T. A. CONRAD. 



MYACITES, Schlottheim. 



M. Pennsylvanicus. Ovato-trigonal ; ventricose ; beaks submedial, anterior 

 sides shortest, subcuneiform, extremity obliquely truncated above? posterior 

 margin obtusely rounded, subangulated at junction with basal margin which 

 is not greatly curved ; beak not prominent ; surface marked with very fine 

 unequal closely-arranged concentric lines ; substance of shell pearlaceous and 

 iridescent. Length ^ inch. 



Locality. Phoenixville, Pennsylvania. 



Occurs in the Black shale with two species of Posidonia. 



[JunC; 



