20 



W. LlLLJEBOKG, 



and have some signs of a division similar to that of the upper branches, 

 the external border being concave. Dimensions of this cervical vertebra: 

 Breadth of the corpus 8£"; height of d:o.6} ;/ ; length of d:o ,.2|"; height 

 of the vertebra 12y"; distance between the extremities of the upper bran- 

 ches of the lateral processes 18-'; d:o between d:o of lower 23!"; 

 height of these last at extremities 3y"; height of the foramen spinale 54-".; 

 breadth of d:o 



4 



That which we look upon as the next or 4 th cervical vertebra, since 

 with respect to the form of the arcus and corpus, the position of the pro- 

 cessus obliqui and direction of the lateral processes, it exactly fits into the 

 proceeding or 3 rd , is of a somewhat slenderer structure. The arcus is equally 

 large and of the same form, and the occasion is accordingly the same 

 with respect to the foramen spinale. Both the upper and lower branches 

 of the lateral processes (diapophyses and parapophyscs) are parallel with 

 those of the foregoing, but both, and especially the lower, are slenderer 

 than they, and not quite so much directed back. Here also the upper branch 

 shows signe of a division at the extremity, but the lower process is there 

 much longer. It does not however show any signs of having been united 

 to the upturned point of the lower branch, but the interval between them 

 has no doubt been filled up with cartilage. The lower branch has at the 

 back of its base a somewhat stronger projecting border. The corpus has 

 also here on the under side a blunt ridge, is concave behind and convex 

 in front, but is thinner, and its length 2". It is destitute of the notch which 

 appeared on the hinder side and middle part of the upper edge of the 

 preceeding vertebra. 



That , which we look upon as the 6 th cervical vertebra (PI. II. fig. 9) , 

 shows a considerable agreement with the corresponding vertebra of the Ba- 

 laenoptera rostrata, except that the corpus is less broad, and the foramen 

 spinale rather larger and higher, though not so high as in the foregoing. 

 The corpus is without ridge on the under side, and the upper branch of 

 the lateral processes is much shorter and smaller than the lower, and both, 

 though but little, directed forward. The corpus is concave in the middle 

 both before and behind. The processus spinosus is higher than on the pre- 

 ceeding vertebra. The somewhat widening extremity of the lover branch 

 of the lateral processes bears evident tokens of the adhesion of cartilage, 

 with which the interval between the ends of the two branches has evidently 

 been filled. At the base of the hinder side of the lower branches is an 

 edge extending abruptly out backward, or a depressed process. Dimensions 

 of that vertebra: Breadth of the corpus 7-f-"; height of d:o 7"; height of 



