526 Wisconsin Academy of Sciences, Arts, and Letters. 



1886. E. Coote." It is a Eutaima sirtalis svrtalis Linn. The 

 light dorsal stripe divides caiidad to the point of division of 

 the vertebral column. The angle presented bv the frontal 

 planes of the two heads is nearly a right angle, that of the 

 sagittal planes is about 70°. The right head is slightly longer 

 and broader than the left one. 



Case VI. This Pitijopliis catenifer Blainv. [Plate XXXV, 

 Fig. 6] lent by the California Academy of Sciences was col- 

 lected by J. W. A. Wright in 1878. It was later described in 

 the American Xaturalist, Vol. XII, p. 264. The angle pre- 

 sented by the frontal planes of the two heads is about 115°, 

 that between the sagittal planes about 35°. A ventral fold 

 of skin which extends fonvard from the point of division in 

 the plane of the gastrosteges is present similar to that in the 

 Ophibolus, Xo. 7276 of the Smithsonian collection. 



Case VII. This is another Opliiholus getulus Linn. [Plate 

 XXXVI, Pigs. 7 and 7a] lent by tlie Smithsonian Institute, 

 It was collected by J. M. Spainhorer in Lenoir, X. C, and bears 

 the number 14540. The frontal planes make an angle of about 

 90°. Their longitudinal axes are almost parallel, however, 

 for the necks curved toward the plane of the common partition 

 and are connected by skin for an unusual distance cephalad. 

 The heads are equal. 



Case VIII. This is a Thamnopliis elegans lineolata Cope 

 [Plate XXXVI, Fig. 8] belonging to the University of Cali- 

 fornia. The data given are ^'Marin Co. ( ?) California. 1879. 

 C A. Allen, collector." An additional peculiarity in this 

 snake is the presence of a sharp angle in the common ver- 

 tebral column, as shown in the skiagraph. The light dorsal 

 stripe, prominent in this specimen, divides sharply 5 mm. 

 cephalad to this angle and so is considerably caudad to the ex- 

 ternal division as well as to the vertebral division. There 

 are twentv-one lons^itudinal rows of scales, which is the nor- 

 mal number for this species, from the sharp angle to a point 

 about two centimeters caudad to it, where two rows end. 

 Cephalad from where the dorsal stripe divides, many new rows 

 begin. The right neck is shorter and the right head slightly 

 shorter and narrower than the left. 



