CLARK: NEW BLA.STOIDS AND BRACHIOPODS. 373 



Schizoblastus granulosus (Keokuk group of Illinois) has a deeply 

 concave base. In Schizoblastus potteri (Burlington limestone of Iowa) 

 the forked pieces are short, only one quarter the length of the body. 

 There is also a hook-like projection at the apex of the ambulacral 

 field. 



Schizoblastus sampsoni (Chouteau limestone of Missouri) has 18 

 side-plates in 5 mm. Its height is one fifth greater than its width, and 

 there is a deep groove running the whole length of the ambulacra; in 

 Schizoblastus haijnesi the food-groove is only slightly depressed. The 

 lateral expansion of the deltoids in Schizoblastus haynesi is one quarter 

 the length of the body. On the whole Schizoblastus haynesi resembles 

 Schizoblastus sampsoni more than any other species, especially in 

 external ornamentation. 



Schizoblastus lotoblastus (White). 



Granatocrinus lotoblastus White, Prelim, rept. inv. foss., 1874, p. 15; Rept. 



U. S. geog. surv. west 100th merid., 1879, 4, p. 80, pi. 5, fig. 3a, b; Bull. 



U. S. geol. and geog. surv. terr., 1879, 5, p. 212. 

 Schizoblastus lotoblastus Weller, Bull. 153, U. S. G. S., 1898, p. 550. 



White reported this species originally from Ewell's Spring, Arizona, 

 but later identified it, with some doubt, from the Teton range, near the 

 headwaters of the Teton River, just west of the common boundary of 

 Idaho and Wyoming. 



Brachiopoda. 



Camarophoria obesa, sp. nov. 



Plate 2, Fig. 13-24. 



Description. — Shell small, subglobular in form, subcircular to sub- 

 pentagonal in outline, longer than wide, wider than thick. Both 

 valves are strongly convex; the pedicle-valve is the more strongly 

 arched longitudinally, the brachial valve transversely. In the pedicle- 

 valve the beak is prominent and overhangs the brachial valve con- 

 siderably. There is a distinct but not strongly marked sinus on the 

 pedicle-valve, within which is a raised median plication. On either 

 side of the sinus are two plications, only the pair bordering the sinus 



