﻿51 8 ACTIN0FTERYG1T. 



description; but it may be added tbat the ridge-scales 

 upon the caudal lobe appear to have been remarkably 

 small. Egerton Coll. 



P. 3487. Small imperfectly preserved individual, 0*26 in length ; 

 Lyme Itegis. The hindermost quarter of the alveolar 

 border of the maxilla inclines sharply downwards and 

 backwards, and bears very slender large teeth directed 

 forwards. The cranial roof is shown to have been closely 

 tuberculated, and there are faint indications of minute, 

 sparsely arranged tubercles on the operculum and sub- 

 operculum. Some of the neural and haemal arches are 

 indicated, and thenotochord does not appear to have been 

 even in part surrounded by hypocentra and pleurooentra. 

 The ridge-scales of the upper caudal lobe are well shown, 

 very delicate, narrow, and attenuated. EnnisTcillen Coll. 



P. 3487 a. Imperfect fish, 0*37 in length, displaying the inferior 

 aspect of the head, pectoral fins, the impression of a 

 pelvic fin, and the equality of the lobes of the caudal fin ; 

 Lyme Itegis. EnnisTcillen Coll. 



P. 3487 b. Imperfect head and anterior abdominal region of a 

 large fish, lateral aspect, and the extremity of the caudal 

 region perhaps of the same individual, but, if so, from 

 the counterpart slab ; Lyme Eegis. The clavicle and 

 supraclavicle are observed, ornamented with irregular 

 short striae and coarser reticulating rugae ; there are small 

 fulcra on the anterior border of the inferior lobe of the 

 caudal fin ; and several other characters mentioned above 

 are confirmed. EnnisTcillen Coll. 



P. 3487 C. Head and abdominal region, left ventro-lateral aspect, 

 displaying the dentition, opercular apparatus, and paired 

 fins, with a fragment of the anal fin ; Lyme Eegis. Only 

 the hinder shortest rays of the pectoral fin are articulated, 

 but all the pelvic fin-rays exhibit distant articulations. 

 The suboperculum seems to be nearly equal to the oper- 

 culum in height, and is much broader. EnnisTcillen Coll. 



P. 3487 d-f. Three very imperfect examples of the head and trunk. 



EnnisTcillen Coll. 



P. 872. Imperfect fish, ventral aspect. Egerton Coll. 



P. 2025. Imperfect head, pectoral fins, and abdominal scales, ven- 

 tral aspect : Lyme Regis. Egerton Coll. 



