ELONICHTHYS PECTINATUS. 8» 



quadrate. This specimen shows some of the outer row of teeth, miiuite in size com- 

 pared with the large laniaries, which occupy a more internal position on the edge of the 

 dentary bone. One of these is seen in this figure, which, were it perfect, would measure 

 half an inch in length, while some of those of the outer row attain no greater length 

 than one sixteenth. The laniaries are, however, better shown in fig. 7, which re|)resents 

 an entire dentary bone seen from the internal aspect, with six of the inner series of large 

 teeth in a continuous row along its upper margin, the largest of these being one (piarter 

 of an inch in length. Again, in fig. 8 we have a portion of a dentary bone showing 

 both large and small teeth, the former, however, not attaining the great proportional size 

 of those in the two previous exam[)les. These teeth are stout, conical, enamel-capped, 

 and incurved. 



The external bones and plates of the head are sculptured with a close tuberculation, 

 the tubercles passing at places into contorted ridges (PI. XIII, figs. 3, 4), and it is to be 

 noted that the latter form of ornament is prevalent on the dentary of the lower jaw 

 (fig. 6). These tubercles and ridges are frequently marked again on their side by 

 delicate strise, which converge towards their summits as seen in fig. 5. 



There is nothing special to note regarding the l)ones of the shoulder girdle. Tlie 

 left supra-clavicular {s. cl.) and both right and left post-temporals (p./.) are seen from the 

 inner surface in PI. XIV, fig. 1, and the clavicle and infra-clavicle, as seen in other 

 specimens, are of the shape common to the genus, and are ornamented by coarse 

 contorted ridges. 



The pectoral fin is of the usual acuminate form ; unfortunately in the specimen 

 represented in PI. XIV, fig. 3, the anterior rays are truncated by the edge of the 

 stone. This specimen was, however, chosen for figuring, as it shows very clearly the 

 want of transverse articulations in the anterior rays for about a third of their length — 

 a fact corroborated by all other specimens in which this fin is preserved. 



In the specimen represented on PI. XIU, fig. 1, a good part of the left ventral is 

 seen ; apparently it was long-based, like that of E. striatus, and the same specimen 

 shows the form of the dorsal and anal exceedingly well. The former commences opposite 

 the middle of the interval between the ventrals and the anal, and is of large size,, 

 triangular, high and sharply acuminated in front, and is composed of very numerous rays. 

 The anal is conformed anteriorly like the dorsal, though smaller ; its posterior part is, 

 however, prolonged backwards for some distance in a fringe-like manner, so that its base 

 is about twice as long as ils longest anterior rays. In this nuinner the anal fin of 

 E. pedinatus differs from that of any other species referable to this genus, and comes to 

 resemble that of Fyyopteras. 



Pig. 2 on the same plate represents a detached caudal fin, diminished by one 

 fourth, the extremities of both lobes being unfortunately broken oft'. It is strongly 

 heterocercal, deeply ck-ft, and inequilobate. 



All the fin-rays, with the exception of the proximal thirds of those of the anterior 

 12 



