PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 763 
Measurements in mm.— 
Brachial Surface Mid- Hinge Thick- 
Length length length width width ness Height 
PIGlOty pe | .i'3. nays soe s 6.9 5.0 11.5 8.0 8.2 2.8 4.0 
Paratype (117467c).. 6.9 5.6 11.5 8.1 8.0 2.7 3.9 
Types.—Holotype: 117464a; figured paratypes: 117464b,c, 117465a,b, 
117466a, 117467c ; unfigured paratype: 117465c. 
Horizon and locality—Edinburg formation (Cyrtonotella zone) in Virginia: 
Ravine at the switch just east of Strasburg Junction, Strasburg (15’) Quad- 
rangle ; dam on north fork of the Shenandoah River, 13 miles N. 61° E. of Edin- 
burg, Edinburg (15’) Quadrangle. 
Botetourt formation in Virginia: On the south side of the road 0.2 mile east 
of Strasburg, Strasburg (15’) Quadrangle. 
Edinburg formation (lower Nidulites zone) in Virginia: From the cut on 
U. S. Highway 11, just southwest of entrance to Battlefield Crystal Caverns, 
1 mile northeast of Strasburg; Tumbling Run, 14 miles southwest of Strasburg ; 
both in Strasburg (15’) Quadrangle. 
Shippensburg formation (Pinesburg member—Echinosphaerites zone) in 
- Pennsylvania: In the railroad cut 24 miles southwest of Marion, Chambersburg 
(15’) Quadrangle. 
Same formation in Maryland: In the cut on U. S. Highway 40, on the west 
bank of Conococheague Creek, 7 miles west of Hagerstown, Williamsport (157) 
Quadrangle. 
Discussion —Bulobia virginiensis can be recognized by its small size but 
strongly convex valves. It differs strongly from B. pisum and B. hemisphaerica 
in size and has a much less swollen umbo, less inflated pedicle valve, stronger and 
more crowded costellae. This species occurs in the Cyrtonotella zone and in the 
lower part of the Nidulites zone of the Edinburg formation. 
Subfamily LepTELLominaE Cooper, new subfamily 
Plectambonitidae with elevated visceral disk. 
Genus LEPTELLOIDEA Jones, 1928 
Leptelloidea JoNEs, Mem. Geol. Surv. Great Britain, Palaeont., vol. 1, No. 5, pp. 388, 302, 
1928. 
LEPTELLOIDEA LEPTELLOIDES (Bekker) 
Plate 188, E, figures 25-30 
The figures of this genus and species are introduced for comparison with 
Leptellina. Note difference in construction of cardinal process. 
Types.—Hypotypes: 84257a-d. 
Horizon and locality—Kuckers formation (C,a2): At Kohtla in Estonia. 
