MAin'LANlJ (!i;()T,()(ll('AL SI'KVKY 183 



Crassatellites sp. 



riiit.' XIJI. i'i-s. 1. la. 



The specimon figured possesses cliai'actcrs \'ery difTereiit from any 

 other known species of the ,i;cmis and if iiDi'inal must he new, although it 

 is perhaps only a diseased speciiiicn nf ('. uhirfornils. 



Length, 20 iiiiii.: width, l.") mni. 



Occurrence. — Aquia I'ou.matiox. Clifton Beach. 



Collection. — Johns lio})kins University. 



Family ASTARTIDAE. 



Genus ASTARTE Sowerby. 

 ASTAETE MARYLAXDICA Clark. 



Plate XLII, Fig. 5. 



Astarie niarylandica Clark, 189.5, Johns Hopkins Univ. Circ, vol. xv, p. 5. 



Astarte marylandica Clark, 1896, Bull. 141, U. S. Geol. Survey, p. 80, pi. xxi, tig. 2. 



Description. — " Shell small, rouudedly trigonal, somewhat compressed, 

 thick, nearly eqnilateral; surface concentrically costated and with super- 

 imposed fine striae; nmbones prominent." Clark, 1896. 



Length, 16 mm.; width, 15 mm. 



Occurrence. — Aquia Foematiox. LTpper Marlboro, Brooks Estate 

 near Seat Pleasant, Sheckel's Farm near South Eiver. 



Collections. — Johns Hopkins University, Maryland Geological Survey. 



Family PLEUROPHORIDAE. 



Genus CORALLIOPHAGA Blainville. 



Subgenus ORYCTOMYA Dal). 



CoEALLioPHAGA (Oeyctomya) beyaxi Clark. 



Plate XLIII, Figs. 1, la, 2, 2a. 



Coralliophaga hryani Clark, 1895, Johns Hopkins Univ. Circ, vol. xv, p. .5. 

 Coralliophaga hryani Clark, 1896, Bull. 141, U. S. Geol. Surves-, p. 73, pi. xv, tigs. 

 2a, 26. 



Description. — " Shell transversely oblong, thin, slightly gaping pos- 

 teriorly; prominent fold from nmbo to lower margin; surface with deli- 



