﻿ix. d. i Day: Ophiocephalus striatus 37 



process (135) are used in Plate XI in describing the last ver- 

 tebra but 6, No. 95. 



The hypurals (53) articulate anteriorly with the hypural 

 vertebra (34) and posteriorly with the caudal rays (54, 55). 

 The second from the ventral has its anterodorsal processes 

 designated No. 60. No. 124 lies over the anterior end of the 

 dorsal broad hypural articulating with it, joining this hypural 

 with the dorsal surface of the hypural vertebra (34) . The 

 second broad hypural from the dorsal side articulates with the 

 posterodorsal process of the hypural vertebra (34), the next 

 3 hypurals with the posterior surface of the hypural vertebra 

 (34), while the last broad hypural, or that bearing the process 

 No. 60, articulates with the posterior surface of the hypural 

 vertebra, the two anterodorsal processes passing dorsally ' at 

 the sides. Lying along the most dorsal broad hypural is the 

 narrow hypural (102) , and below the most ventral broad hypural 

 is also a narrow hypural ( ?) (103) , very similar to 102. (Plates 

 I and XII.) 



The anterodorsal processes (60) of the most ventral wide 

 hypural (53) pass off from the anterior dorsal surface of the 

 most ventral wide hypural, extending laterally around the 

 hypural and hypural vertebra (34) lying dorsally, and really 

 forming the haemal arch. The dorsal tips of these processes 

 lie at a considerable distance from the hypurals (53) above, 

 embedded in the muscle. (Plate I and Plate XII, fig. 1.) 



Hypural (?) No. 102 articulates with the anterior portion 

 of the most dorsal broad hypural (53) and with the neural 

 spine of the vertebra that is the last but one. It is of a form 

 similar to the neural spines of the four vertebrae anterior to 

 the hypural vertebra, but in thickness, color, and certain other 

 characteristics it resembles the other hypurals (53) although 

 being narrower. It lies between 124 and the body of its hypural 

 (53) and the neural spine of the vertebra that is the last but 

 one, and articulates with them. In Plate I it lies in articulation, 

 while in Plate XII, fig. 1, it is disarticulated. 



Hypural ( ?) No. 124 is the anterior detached portion of 

 the most dorsal wide hypural (53). This bone receives, in the 

 fossa on the ventral side, the anterior dorsal portion of the 

 first broad hypural (53) and articulates with the hypural ver- 

 tebra (34) ventrally and with the neural spine (51) lying in 

 front. With the neural spine (51) just in front, it forms an 

 arch dorsad of the body of the hypural vertebra (34) . Plate 



