The Spotted Eagle Ray. 



295 



of the dorsal fin, where they form very distinct patches. From these 

 patches on either side of the dorsal a series of pores extends backward on 

 the sides of the tail, running out to nothing under the spines. 



Text-fig. 17. — Lateral-line system of A. narinari: A, Dorsal; B, ventral. After Garman. 



Beginning at and behind the spiracles a second series of pores extends 

 out along the front edge of each pectoral to about its middle point, then 

 each swings backward, inward, and forward to join the two parallel back- 

 wardly going bands just posterior to the lobe-like patches previously re- 

 ferred to. These lines and pores form fanciful figures which run both over 

 and between the spots. So far as my specimens showed, these pores are 

 found rather sparingly on the head, being most abundant on the snout and 

 below the eyes. These pores are presumably homologous with the lateral 

 line pores of Teleosts. Text-figure 16 is a semi-diagrammatic drawing of the 

 dorsal pore-system of Aetobatus narinari. Pores were found on the under 

 side of the body, but not making figures as on the dorsum. The under side 

 of the snout and the central part of the upper lip were so filled with a network 

 of cavities, rather larger than the dorsal pores, as to give the skin over these 

 parts a spongy appearance. 



Since this paper went to press, I have chanced upon Carman's memoir 

 (1888-89), "The lateral line system of Selachia and Holocephala." Since 

 his figure and its description are very different from the above, the former 

 is herein reproduced ?.s text-figure 17, A being the dorsal, B the ventral 

 view of the same. 



