112 WEALDEN AND PURBEOK FOSSIL FISHES. 



i ii the Lower Put-beck of Teffont, Wiltshire, by the Rev. W. R. Andrews (B.M. 

 no. P. 9850); and a nearly complete specimen from an unrecorded locality near 

 Weymouth (B.M. no. 1*. 7506). The type specimen is preserved in counterpart, 

 but the head and caudal fin are crushed and imperfect, while a vein of calcite 

 crosses obliquely the hinder end of the abdominal region. Remains of the cranial 

 roof show that the bones are smooth or only faintly rugose. The frontals (fr.) 

 form a symmetrical pair separated by a straight median suture, and excavated 

 laterally by a large orbit. The parietals (pet.), which are also a symmetrica] pair 

 divided by a straight median suture, are each longer than broad, and marked 

 behind by a large groove for the transverse slime-canal. They are well seen again 

 in inner view in B.M. no. P. 9850. The parasphenoid, which is displaced, is very 

 stout. The mandibular suspensorium must have been inclined forwards, and the 

 small fan-shaped quadrate (qh-), with its posterior cleft for the symplectic, is seen 

 in the fossil below the front of the orbit. Remains of the opercular apparatus 

 show that it is smooth. 



The vertebral centra are delicate rings, which appear to have been arranged in 

 a spaced series, so that in their crushed condition in the type specimen most of 

 them are exposed in end-view. Some of those in the abdominal region of B.M. 

 no. P. 7506 are in side-view, and shown to be slightly constricted. Towards the 

 end of the caudal region the centra may have been incomplete, and in the upturned 

 extremity they are apparently absent. In advance of the dorsal fin the neural 

 arches are much shorter than their appended spines, which are loosely apposed and 

 seem to have nearly reached the dorsal border. Beneath the dorsal fin the short 

 neural arches bear extremely short spines. The ribs shown in the type, but best 

 seen in B.M. no. P. 9850, are short and delicate throughout the abdominal region. 

 The short neural and haemal spines in the caudal region are fused with their 

 respective arches, and these also probably with the vertebral rings. Where the 

 axis is upturned within the caudal fin, the haemal spines are enlarged and 

 thickened as usual. There are no traces of intermuscular bones. 



The fins consist of long, slender rays, with distant articulations, and apparently 

 not forked more than once at the distal end. Each is fringed by a few very long 

 and slender fulcra, which are conspicuous by their enamelled surface. The clavicle 

 i<7.) is relatively large and much curved, widest below, and with a thin laminar 

 expansion in its anterior concavity. Above the left clavicle, which is displaced 

 backwards in the type specimen, there is a deep and narrow supraclavicle (scl.). 

 There also seem to be remains of large, smooth postclavicular scales. Both the 

 pectoral and pelvic fins are crushed close to the body, and display their character- 

 istic fulcra. One of the pelvic fin-supports is seen, slightly expanded proximally, 

 much constricted mesially, more widely expanded distally. The length of the 

 longest rays of the short dorsal fin is greater than the depth of the trunk at their 

 insertion, and the elongated fulcra are especially stout at the base. Nine supports, 



