DETAILS OP BODY PARTS 408 



Behind the opercular apparatus occurs a long and rather large arched 

 clavicle, traversed by longitudinal stria3. Adjoining it are to be seen on 

 one or two specimens impressions of postclavicular scales, which are 

 likewise striated. The supraclavicle is not distinguishable. 



FINS 



The dorsal and anal fins arfe triangular in shape, not extended, and 

 of about medium size, the dorsal arising slightly behind the pelvic fins, 

 which are abdominal in position. The pectorals are much larger than 

 the pelvic fins, and both are without basal supports. Were baseosts 

 present, they could hardly fail to be preserved on such specimens like 

 those shown in plate 46, figure 1, and plate 47, figures 1-3 ; their absence 

 is an important distinguishing characteristic. Another minor point of 

 difference from Eugnathus is seen in the regular scale arrangement at the 

 base of the deeply forked caudal fin. 



Well developed falcra are present along the anterior margin of the 

 dorsal, anal, and paired fins, and on both lobes of the caudal. The rays 

 of the latter are very finely divided and the right and left halves liable 

 to displacement, which makes them difficult to count. For this reason 

 a precise radial formula cannot be given, and the following must be con- 

 sidered as merely approximate : 



D 10; C 25-28; A 12 ; V9; P 15. 



SCA LES 



The trunk is covered with thin, smooth ganoid scales of rliombic out- 

 line, arranged in 45 regular oblique series, four or five of which occur on 

 the tail, and in about 22 longitudinal series counting along the middle 

 of the body. The principal flank scales are somewhat deepened for a 

 variable distance behind the head, but their depth rarely exceeds twice 

 their breadth. Several series of ventral scales are much broader than 

 deep, and in advance of the anal fin are much subdivided. The prin- 

 cipal flank scales are united by a peg-and-socket articulation, but there 

 is no evidence of a vertical rib on the inner face. The overlapped border 

 is rather narrower than in most Pholiphoridas. 



Several large postclavicular scales are connected with the clavicle, and 

 appear to have been covered with delicate longitudinal or branching 

 strise. A few enlarged scales are to be noticed along the dorsal and 

 ventral margins of the caudal pedicel (plate 47 figure 2), and also close 

 to the anal fin. These last undoubtedly mark the position of the anus 

 (plate 45, figure 1; plate 46, figure 1). Two or three specimens exhibit 



