MARYLAND OEOLOGICAL SURVEY 451 



horn; proportional lengths of joints = 3:5:8:8:8-1- ?; cephalis with 

 a few scattered pores, second joint with numerous irregular pores, third 

 joint with seven rows, fourth joint with six rows, and fifth joint with 

 seven rows (-|- ?) of large regular pores. 



Occurrence. — Calvert Formation. Lyons Creek. 



Collection. — Maryland Geological Survey. 



Genus STICHOCAPSA Hneckel. 

 Sticliocapsa iiACROPORA Vinassa. 



Plate CXXX, Figs. 6, 7. 



Stichocapsa macropora Viuaifsa, 1900, Mem. d. R. Accad. d. Sci. d. Istit. d. Bologna, 

 ser. Y, vol. viii, !>. 25o, ])!. iii, ti;^. 47. 



Description. — " Guscio assai grande e spesso, scabroso. Capo sferico 

 perforate. Torace conico poco rigonfio; terza loggia slargata. quarta 

 ed ultima grande. tondeggiante in basso. Fori ampi. circolari. non 

 molto fitti. rcgolannente alternanti." Yinassa. 1900. 



Shell rough, pear-shaped, with two or three more or less distinct 

 strictures and three annular septae; cephalis small, subspherical ; joints 

 (except the cephalis) of approximately equal length; third joint broad- 

 est; pores quite large, irregular in size and shape. 



The individuals here referred to Vinassa's species show considerably 

 variation both among themselves and from Vinassa's figure. It is pos- 

 sible that further study will lead to the recognition of several species 

 among the Maryland forms. 



Occurrence. — Calvert Formation. Popes Creek, Plum Point. 

 Chesapeake Group. Richmond, Ya. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Rev. Edward Huber. 



Family ANTHOCYRTIDA. 



Genus ANTHOCYRTIUM Haeckel. 



Anthocyrtium doronicum Haeckel. 



Plate CXXX, Fig. 8. 



Anthocyrtium doronicutii Haeckel, 1887, Chal. Kept., vol. xviii, pt. ii, p. 1270, pi. 

 Ixii, lig. 18. 



