6 University of Michigan 



131-149, female. 131-137), average male, 141. 9, average fe- 

 male, 134. The proportionate tail-lengths are, male, 0.326, 

 female, 0.290. The supralal)ials are 8, the fourth and fifth 

 entering orhit, the fifth being prolonged up and behind the 

 eye. The inf ralabials are usually 9, often 10 ; the oculars 

 2-2; the temporals usually 2 -|- 2 -f 2 (PI. II, Fig. i), except 

 that there are often 3 in either the first, second, or third series, 

 and sometimes 4 in the second or third series. The posterior 

 chin shields are longer than the anterior, the former being sep- 

 arated by 3-5 small scales ; the loreal is longer than high. 

 (PI. II, Fig. 2.) 



The head is long and narrow, the width (just posterior to 

 the eye) divided by the length averages 0.43. 



The largest specimen examined is 168 cms. in total length, 

 of which the tail comprises 52 cms. 



The penis exhibits the following structure: Strongly bifur- 

 cate, the length of the forks being about one-seventh the total 

 length of the organ; sulcus simple, extending to the tip of the 

 penis on the side of the larger lobe; distal surface smooth, 

 surrounded by rather deep, strongly-fringed calyces, which 

 extend proximally in about 9-10 rows, calyces covering between 

 a third and a half of the entire organ; the fringe of the calyces 

 at a point about halfway to the base, rapidly changing to dis- 

 tinct, small spines, which become larger toward the base of 

 the organ; spines 43-46, in 3-4 (sometimes 5) rows; three 

 large basal spines proximad of general spined portion ; region 

 along the sulcus, through the spined area, thickly covered with 

 spinules (PI. III). 



The dentition, as shown by several specimens, is as follows : 

 maxillary teeth 16-17, coryphodont, dicrantcrian, the last 



