152 Buiyl^ETlN 31 153 



GrateSoupia (Cytheriopsis) hydana Conrad, PI- 47, Figs. 12, 13 



C. hydana Con., Foss. Sh. Tert. Form., Aug, 1833, p. 36. Harris' Re- 

 print, pi. 20, fig. 3. 

 Gratelupia moulinsi l^&a, Cent, to Geol., 1833, (Dec.) p. 59, pi. 2, fig. 



33- 

 Cytheriopsis hydana Con, Am. Jr. Conch., vol, i, 1865, pp. 7 and 146 ; 



vol. 3, 1S67, p. 14. 

 Gratelotipia moulinsi de Greg., Mon. Faun. Eoc. Ala., 1890, p. 221, 



pi. 34, figs. 28-33. 

 Mereti'ix dalli Cossm., Notes Compl., 1893, p. 11, pi. i, figs. 9, 10. 

 G. {Cyt.) hydana Dall, Trans. Wag., Ill, 1900, p. 1239. 



Conrad'' s original description. — Shell subtriangular, inequilateral ; 

 posterior side slightly channelled ; posterior end cuneiform ; lunule lance- 

 olate, elliptical. 



I gladly name this fine species in compliment to Mr. William Hyde, 

 one of the most successful and zealous cultivators of American Conchology. 

 Length 2 inches. Breadth i ^ inches. 



Locality. — Claiborne, Ala. Cab. Acad. N. S. 



I think Dall is correct in referring Cossmann's dalli \.q> the 

 young of hydana^ although it at first seems strange that in the 

 young the posterior should be large and rounded,, the anterior 

 acute, while in the adult the reverse is true. 



However, by examining small specimens and the umbonal 

 parts of larger ones, one is readily convinced that this change 

 takes place during the growth of the shell. Half -grown shells 

 when nearly equally pointed at either end de Gregorio calls var. 

 sytnetrica. 



Type.—Vhila. Acad. Coll. 



Horizon. — Claiborne stage. 



Specimens figured. — Paleont. Mus. Cornell Univ. 



Locality. — ^Claiborne, Ala. 



Gemma sancti-mauricensis, n. sp., PI. 47, Figs. 14, 15 



Specific characterization. — Shell small, somewhat Astarte-lik^e. 

 exteriorly as figured ; increments of growth well-defined, rounded, 

 becoming much less conspicuous on the anterior and posterior 

 margins which fall off rather abruptly ; lunule rather long, stri- 

 ate, and defined by a faint channel, not a sharply incised line ; 



