414 SYSTEMATIC PALEONTOLOGY 



size, -usually one, rarely two to each zooecium, of the same type as in 

 A. flemingi but with the apex more prominent. 



This species is closely related to A. flemingi (Busk) and A. trifolium 

 (Wood), both living- in the seas of to-day and known also as fossils from 

 late Tertiary beds of England and Italy. It is distinguished from both 

 by the lesser development of the frontal lamina. The constriction of the 

 aperture is usually more pronounced in A. constricta. 



Occurrence. — St. Mary's Formation. Cove Point. 



Collection. — Maryland Geological Survey. 



Amphiblestrum agellus n. sp. 

 Plate CXII, Figs. 7a, 7b. 



Description. — Zoarium forming small patches upon molluscan shells. 

 Zooecia irregularly subrhomboidal, sharply defined, 9 or 10 in 3 mm. 

 Aperture distinctly bilobed, the posterior lobe the wider; anterior lobe 

 enclosed by a distinct rim, terminating at the constriction in a small 

 hollow node ; length of aperture scarcely exceeding half that of the entire 

 zooecium. Lamina well developed, sloping inward, smooth. Ovicells 

 few, known only in the broken condition, when it appears as a large shal- 

 low depression in front of the aperture. Posterior end of zooecium usu- 

 ally with a rather large, subcircular pore ( ? aviculariura). 



This is a very neat form, comparing very well in most of its characters 

 with the typical species of Amphihle strum, but it differs markedly from 

 them in its avicularia, if the round pores near the posterior ends of the 

 zooecia are really of that nature. The zooecia are consideral^ly smaller 

 also than in any of the species which it resembles in other respects. 



Occurrence. — St. Mary's Formation. Cove Point. 



Collection. — Maryland Geological Survey. 



Family MICROPORID^E. 



Genus CUPULARIA Laniouroux. 

 CupuLARiA denticulata (?) (Conrad). 

 Plate CXII, Fig. 6. 



LunuUtes denticnlata Conrad, 1841, Amer. -Jour. Sci., vol. xli, p. 348. 

 LumiUtes depressa Conrad, 1841, Amer. Jour. Sci., vol. xli, p. 348. 

 LunuUtes denticulata Lonsd ale, 184.5, Quart. Jour. Geol. Soc. London, vol. i, p. 503 

 Discoporella denticulata Gabb and Horn, 1863, Jour. Acad. Nat. Sci. Phila., 2nd sen, 

 vol. V, p. 243, flg. 35. 



