432 SYSTEMATIC PALEONTOLOGY 



Ant. lat. dors. amb. 8 + 10. Post. lat. dors. amb. 13 + 8." Forbes, 1845. 



This form is quite rare, the single specimen whicli is figured being 

 apparently the only well-preserved one found since the days of Conrad 

 and Forbes. The specimens of both Conrad and Forbes were found near 

 Coggin's Point on the James Eiver, Virginia; that of Forbes being 

 secured by Lyell. The locations of the types are not known, but Forbes' 

 figures are very good, as are also those of Ainphidetus ortlionotus given by 

 McCrady in Tuomey and Holmes' Pleiocene Fossils of South Carolina, 

 and there can be little doubt that the Maryland specimen represents the 

 species. 



Occurrence. — Cpioptank Formatiox. Jones Wharf. Chesapeake 

 Group. Coggin's Point, Virginia (Conrad, and Lyell and Forbes). 



Collection. — Maryland Geological Survey. 



Order CLYPEASTEROIDA. 



Family SCUTELLID/E. 



Genus SCUTELLA Lamarck. 

 ScuTELLA .ABERTi Conrad. 



Plate CXIX, Figs. 3, 2a; Plate CXX, Figs, la, lb, 2a, 2b. 



Scntella aherti Conrad, 1842, Proc. Nat. Inst., Bull, ii, p. iy4. 



ScuteUa ulherti Meek, 1864, Miocene Check List, Smith. Misc. Coll. (18.3), p. 2. 



Description. — " Discoidal, orbicular, very much depressed, but swell- 

 ing towards the middle, and depressed at the apex; diameter five and a 

 half inches." Conrad, 1842. 



This large and abundant form has never been figured, but there is no 

 doubt as to its identity. Perfect individuals are very rare, although 

 fragments are extremely abundant in the thin Ijed to which it is restricted. 



Length, 160 mm.; width, 150 mm. 



Occurrence. — Choptank Formation. Jones Wliarf, Governor Eun, 

 Dover Bridge. 



Collections. — Johns Hopkins University, Maryland Geological Survey. 



Indeterminate Echinoid Spines and Plates. 



Echinoid spines and fragments of plates are abundant at many locali- 

 ties in all of the ]\Iiocene formations of Maryland. They certainly rep- 



