608 



BR. G. E. NICnOLLS ON THE 



correct to say that in the great majority of the individuals of 

 this species, the paired foramina for the tenth spinal nerves are 

 absent or imperfect. 



The Shoulder -Girdle and Sternum. 



The shoulder-girdle of R. tigrina (text-fig. 3) is very stoutly 

 built and, in general, resembles the condition of the corresponding 

 structure in R. esculenta. 



Text-fia^ure 3. 



The Slioulder-3:irdle and Sternum of Bana tigrina (nat. size). 



(A) Ventral view, and (B) dorsal view. In the latter the supra-scapula is removed 

 upon the right side. 



cl., clavicle ; m., metasternum ; o., omosternum ; r.co., Leo., right and left 

 coracoids ; sc, scapula. 



In one particular, however, viz., in the arrangement of the 

 coracoids, it presents a condition which has not, I believe, been 

 recorded in any of the Firmisternia. 



