Dec, 1920] Cystids and Blastoids 57 



short grooves branch off from the main food-groove and terminate 

 abruptly near the middle of thecal plates, but without any evidence of 

 facets for the support of brachioles. Compared with Gomphocystites 

 indianensis, the surface is papillose rather than granulose, the papillae 

 being about 1.5 mm. or more distant from each other. The width of the 

 food-groo^'es is about a millimeter or slightly less, and their cross-section 

 is shallow U-shaped, rather than deeply V-shaped. 



Locality and Horizon. — From the base of the Louisville 

 limestone, immediately over the Waldron shale, at the railroad 

 cut two miles east of Anchorage, Kentucky. 



Remarks. — While this Louisville specimen is regarded as 

 belonging to a new species, the state of preservation of the 

 specimen figured makes the latter undesirable as a type. 



12. Gomphocystites bownockeri Sp. nov. 

 (Plate III, Figs. 1 A, B; Plate I, Figs. 6 A, B; 9 A, B; Plate II, Figs. 9 A, B.) 



Ohio specimens. — Thecas obliquely compressed, originally probably 

 depressed globose, rapidly narrowed at the base to a short stipe, probably 

 not over 10 or 15 mm. in length. Oral aperture elongated transversely, 

 about 4 mm. wide and 3 mm. long from front to rear along its median 

 line. Thecal plates varying in size ; those along the outer margin of the 

 food-grooves tending to be smaller, more or less elongated at right 

 angles to the food-grooves, the intermediate sutures having the same 

 direction, the resulting appearance being that of oblong bodies packed 

 together laterally. Usually only that row of plates which is in imme- 

 diate contact wnth the food-groove presents the laterally compressed 

 appearance in a striking manner, but a second row frequently offers a 

 similar appearance along a part of its length and in a less obvious manner. 

 In the spaces between those rows of plates which are adjacent to the 

 food-grooves there are other plates varying considerably in size and 

 some of these plates are much larger than any forming the rows. Larger 

 plates occur also along the lower part of the theca, including the stipe. 



The anal apertni-e is 4 mm. in diameter, and 3 mm. distant from the 

 nearest part of the oral aperture. The food-grooves extend at least below 

 mid-height of the globular part of the theca, and probably reach its lower 

 part. The food-grooves are faintly impressed on the type specimen, the 

 latter being regarded as a cast of the interior of the theca. 



The plates show marginal depressed areas, with central raised parts, 

 interpreted as evidences of marginal growth. The marginal depressed 

 bands of the larger plates are about 1 mm. in width, and those of the 

 smaller plates are narrower, suggesting the later intercalation of the 

 smaller plates. 



Locality and Horizon.— From the Cedarville dolomite at 

 Cedarville, Ohio. Type, numbered 8736A, in the Museum at 

 Ohio State University. A second specimen, 8736B, 40 mm. in 

 width, shows similar features. 



