Maryland Gkological Survey 657 



This verv pretty and well-df fined species has the external as]>ect of a 

 nueiihiid hut carries tlie hiiii;'e characters of ('i/j/ricarJclhi in (pnte re- 

 markalde development compared with the usual condition in which these 

 have been heretofore observed. On this account the species is of more 

 than (iidinary interest as exemplifying- the hinire cliaraeters of a genus 

 in which thcv have not heen well understood. 



Occurrence. — Jknxings FoiiMATioN, Chemung Member. Eoad north 

 of Deer Park Station in huff sandstone, Garrett County; a few miles 

 west of Frostburg. 



Collection. — Maryland Geological Survey. 



Cypricardeli.a cumijerlaxdi.e n. sp. 

 Plate LXVI, Fig. 13 



Description. — Shell subrhomboidal io suhcircular, length about one- 

 fifth greater than height. Anterior and posterior extremities rounded, 

 ventral and cardinal margins curved, umI)o anterior, not prominent. 

 Surface ornamented by strong concentric stri;v. Interior unknown. 



Length 'it') mm.; height 2'-] mm. 



This species differs from Cypricardellu hcllislriaUi in being more cir- 

 cular, less constricted anteriorly and not so distinctly truncated poster- 

 iorly, umbonal slope less angular. If resembles C. marylandica but is 

 much larger in size, more circular in outline, its anterior nuirgin less 

 oblique, its concentric stria; coarser. Only two poorly preserved valves 

 have been observed, which do not seem clearly referable to any previously 

 described species. 



Occurrence. — Jennings Forjeation, Chemung Member. Allegany 

 Grove, rUO. 



Collection. — Maryland Geological Survey. 



Cypricardella crassa n. sp. 

 Plate LXVI, Figs. 14-20 



Description. — Shell small, suhrhond)oidal. height about eight-tenths 

 or eight-ninths length, umbo anterior, cardinal margin forming a slight 

 42 



