290 



Bashford Dean Memorial Volume 



on the head of Chlamydoselachus is that of AUis (1923, pp. 195-203). We reproduce his 

 plates as our Text-figure 21 and Figure 7, plate II. It is outside the plan and purpose of this 

 paper to discuss the details of the distribution of the whole sensory canal system on the 

 head of our fish. They are clearly shown in our reproductions of Allis's figures and in the 

 explanation of his lettering of his drawings, and any one seeking an exact description of 

 them is referred to his text. 



Intimately associated with the lateral line system on the head of Chlamydoselachus 

 are the pores of the ampullae of Lorenzini and of the pit-organs. The distribution of these 

 organs and canals is adequately portrayed by Garman (our Text-figure 20), and by Allis 

 (our Text-figure 21 and Figure 7, plate II). 



THE TAIL OF THE FRILLED SHARK 



As we shall see later, the Japanese 

 call Chlamydoselachus the '■'■h2;ard shark," 

 probably because of its elongate slender 

 body terminating in a long slender pointed 

 tail. The tail of our fish includes all 

 those structures posterior to a transverse 

 plane cutting through the cloacal opening. 

 The tail is compressed laterally and on its 

 anterior portion bears the dorsal and anal 

 fins. The hinder part of the tail bears 

 the caudal fin, and its structure will be 

 more conveniently described later in con- 

 nection with that organ. However, we 

 here give some measurements. Carman's 

 first specimen (1884.1) lacked the tip of 

 the tail, but of his second, which was 

 1220 mm. (48 in.) long, he wrote (1887) 

 that "the tail was a little more than one- 

 fourth of the total length." In Collett's 

 (1910-mm.) specimen, the tail from the 

 anterior base of the anal measured 470 

 mm. (24 per cent), a fair agreement with 

 Garman. However, Bragan^a's (1904) 

 measurement was a 405-mm. tail on a 920- 

 mm. specimen. Here the tail measures 

 0.44 of the total length. 



The measurements for our much 

 shrunken and wrinkled adult female speci- 

 mens follow. No. I is 1350 mm. long and 

 has a tail measuring 531 mm. or 39 per 



- - _ -i°''"p 



Text-figure 21 



Dorsal view of the head of Chlamydoselachus, showing 



the external openings of the ampullae of Lorenzini and of 



the latero-sensory canals. 



amp, ampullary pores; end, pore of the endolymphatic duct; iop, 



infra-orhital latero-sensory pores; lie, lateral line canal of body; sop, 



supra-orbital latero-sensory pores; sp, spiracular latero-sensory canal; 



spr, spiracle. 



Redrawn after Allis, 1923. 



