The Anatomy of Chlamydoselachus 



371 



Text-figure 37- 



Pectoral girdle and endoskeleton of pectoral fin of 



Chldmydoselachus, aspect not stated. 



cr, coraco-scapular; msp, mesopterygium; mtp, metapterygium; 



prp, propterygium. 



After Garman, 1885.2, Fig. 2, pi. XI. 



be seen upon comparing Text'figures 37 and 38. 

 There are differences in the number, si7;es and shapes 

 of the basal cartilages, particularly the mesopterygium. 

 In Carman's figure this is triangular in outline, in 

 Braus's figure it is more nearly quadrangular. The 

 anterior radials are fused over a considerable area in 

 Braus's figure, but exhibit a more limited amount 

 of fusion in Carman's figure. In Braus's specimen, 

 many of the radials posterior to the region of fusion 

 have four or five segments; in Carman's specimen, 

 there are nowhere more than three segments of a 

 single radial. Deinega's Fig. 14, Taf. IV, portraying 

 a pectoral fin (aspect not stated) of Chlamydoselachus 

 closely resembles Carman's figure (my Text-figure 37) 

 save that right and left are reversed. Deinega's Fig. 

 15, Taf. IV, representing an inner (ventral) view of 

 a pectoral fin of Chlamydoselachus, more nearly re- 

 sembles Braus's figure (my Text-figure 38) which is 

 also a ventral view. The chief differences in the fig- 

 ures thus far considered are understandable on the 

 assumption that Carman portrayed a dorsal view, 

 and that Deinega's Fig. 14 is also a dorsal view. In 

 Deinega's figures of the pectoral fin, some of the lines 

 at the distal margin are so indistinct that one cannot 

 determine the exact number of cartilaginous elements; 

 but in his text he states that there are three rows of 

 radial segments. Coodey's drawing (1910.1, Fig. 18, 

 pi. XLV) of the left pectoral fin (aspect not stated) of 



Text-figure 38. 



Ventral (inner) view of a pectoral fin 



skeleton of Chlamydoselachus. 



Co, coracoid; F, foramen for blood vessel; G, 

 shoulder joint; ms 1, primary mesopterygium; 

 ms 2, secondary mesopterygium; mt, metapter- 

 ygium; P, propterygium; S, scapula; Ss, supra- 

 scapula; 1-4, cartilages in line with basals. 

 After Braus, 1902, Fig. 1. 



