416 GEOLOGICAL SUEVEY OF THE TERRITORIES. 



SATTROCEPHALTTS PHLEBOTOMTJS, (OOPE.) 

 (Proceed. Amer. Philos. Soc, Nov., 1870, p. 530.) 



Established on some vertebrae and portions of the cranium, the latter 

 including the dentary, maxillary, part of the prem axillary, the palatine, 

 and vomerine bones, compressed into a mass by pressure, the separate 

 pieces preserving nearly their normal relations. From the latter the 

 following characters may be derived : 



Palatine bones toothless ; teeth of both maxillary and dentary, with 

 compressed crowns, which are longer than wide at base, and closely 

 placed, those of the dentary twice as large as those of the maxillary. 

 Maxillary bone proximally deep ; dentary shallower, the maxillary with 

 elongate suture with the premaxillary behind. 



The teeth are equilateral, without intermarginal groove or barb, and 

 with smooth enamel surface, or only minutely striate under the micro- 

 scope. A series of larger foramina extends along the alveolar margin of 

 the maxillary and dentary bones, one foramen to each tooth. The alve- 

 olae are confluent as they approach this margin. 



There are three vertebra?, which present two pairs of deep longitudinal 

 grooves, viz : two on each side, two on the inferior, and two on the su- 

 perior face of the bone ; the last receives the basal articulation of the 

 haemapophyses. The centra are crushed ; their measurements with 

 those of the jaws are as follows : 



M. 



Length centrum 025 



Long diameter (crushed) . 035 



Short diameter (crushed) 0175 



Depth maxillary bone anteriorly 031 



Depth dentary bone anteriorly . 015 



Length crown inferior tooth 006 



Number crown inferior tooth in .01m 3 



Number crown superior tooth in .01m . 4. 5 



Length crown superior tooth in .01m 0046 



The vertebrae are about as large as those of a fully grown " drum fish," 

 Pogonias. 



From the yellow chalk of the upper cretaceous of Kansas, found on 

 the Solomon or Nepaholla River, Kansas, at a point 160 miles above its 

 mouth, by Professor B. F. Mudge, professor of natural science in the 

 State Agricultural College of Kansas. 



I append a description of some caudal vertebrae of a species probably 

 different from the 8. phlebotomus. It is indicated by three consecutive 

 caudal vertebrae which resemble those of 8. prognathus and 8. thaumas, 

 but which differ also considerably from both ; the several arches and 

 spines are of very great width ; in 8. thaumas they are narrow, and in 

 8. prognathus as wide, but' here their width exceeds the depth and 

 equals the length of the centrum. As in the other caudals, the lateral 

 grooves are wanting and the inferior pair remain separated by a lamina. 

 The neural suture is very distinct, and not two-angled as in 8. prognathus, 

 but with a median decurvature and rise anteriorly. The neural spines 

 are twice as wide as deep and lie on each other. The third vertebra is 

 shorter than the others and contracted distally ; it is probably the pen- 

 ultimate of the series j neural canal minute. Surface striate-ridged. 



