722 E. C. CASE 



the lower margin about an inch from the posterior end ; on the anterior por- 

 tions the lines are straighter and lie parallel to the length of the jaw. The 

 teeth were very small. A small fragment attached to the inner side of it is 

 covered with many minute teeth ; this may be a portion of the dentition of the 

 upper jaw. [No. 6571.] 



A collection of fragments showing a fine sculpture on one side are prob- 

 ably portions of the skull of Diplocanlus. Among these are imperfect plates 

 with a much coarser sculpture, which are probably abdominal scales. [No. 

 6572.] 



There are two pubes nearly complete ; they may belong to Cricotus. 

 There is a considerable portion of the acetabular face present. This portion 

 of the bone is thickened, and besides supporting the acetabular face has a 

 broad face for the ilium. Just below these faces the bone is perforated by a 

 foramen. Beneath the foramen is the symphasial region, which is remarkably 

 broad and thick in proportion to the rest of the bone. In general the outline 

 of the bone was subround, but the lower posterior portion was very thin, and 

 portions have been broken away in both specimens. On the upper margin, 

 posterior to the facet for the ilium, there is a slender tubercle which bears an 

 articular facet ; in one specimen this is isolated and in the other it is confluent 

 with a broad facet on the thickened posterior border. Plate IV. Figs. 6, a 

 and b. [No. 6573.] 



There are a few coprolites of small size. They show spiral markings 

 indicative of a spiral vale in the stomach of the form to which they belonged. 

 [No. 6574.] 



EXPLANATION OF PLATES. 



PLA TE I. 



Fig. 1. Janassa linguceformis. Twice nat size, a) from below, b) from 

 above, c) from the side. 



Fig. 2. Janassa gurleyna. Twice nat. size, a) from below, b) from above, 

 c) from the side. 



Fig. 3. Pleuracanthus quadraseriatus. a) from the side, b) from the 

 front. 



Fig. 4. P. gracilis. 



Fig. 5. P. comfiresstes. a, b, c, and d. 



Fig. 6. Sagenodus vinslovii. a) from below, b) from above. 



Fig. 7. S. vabasensis. 



Fig. 8. S.gur ley anus, a) from below, b) from above, c) from the side. 



FlG. 9. S. pusillus. a) from below, b) from above. 



FlG. 10. S. fossatus. a) from below, b) from above. 



Fig. 11. S. paucicristatus. a) from below, b) from above. 



