CATURUS. 



83 



slender, not reaching' the ventral border of the abdominal region. Fulcra biserial, 

 well-developed on all the fins, those of the pectoral being especially elongated and 

 sometimes in part fused together. Pectoral much exceeding the pelvic fins in size, 

 but the latter well-developed; dorsal and anal fins triangular in shape, the former 

 arising opposite or immediately behind the pelvic fins ; caudal fin deeply forked. 

 Scales thin, smooth, feebly crimped or in part tuberculatecl, deeply overlapping, 

 and none much deeper than broad ; a few anterior series quadrangular and some- 

 times united with peg-and-socket, the others more or less cycloidal, and very few 

 narrowed near the ventral border. Lateral line inconspicuous. 



Type Species.— Gaturus furcatus (L. Agassiz, Poiss. Foss., vol. ii, pt, ii, 

 1842—44, p. 116, pi. lvi«) from the Lithographic Stone (Lower Kimmeridgian) 

 of Bavaria. See Text-fia-. 26. 



Remarks. — This genus is represented only by fragments in the Wealden and 

 Purbeck Formations. It is known by many nearly complete fishes from the 



Fig. 27. — Callopterus insignis, Traquair ; restoration, showing scales, much reduced in size. — Wealden ; 

 Bernissart, Belgium. After B. H. Traquair. 



Lithographic Stone of Germany and France ; and its cranial osteology is well 

 displayed in numerous fragmentary specimens discovered by Mr. Alfred N. Leeds 

 in the Oxford Clay near Peterborough (A. S. Woodward, Ann. Mag. Nat. Hist. 

 [6] vol. xix, 1897, pp. 292—297, pis. viii, ix). 



1. Caturus (Callopterus?) latidens, sp. nov. Text-figure. 28. 



Type. — Imperfect skull ; British Museum. 



Specific Characters. — Marginal teeth broad, laterally compressed near the apex, 

 and bluntly pointed ; those of middle of maxilla about as deep as the bone at their 

 insertion. 



Description of Specimen. — The type and only known specimen was discovered 

 by Mr. S. H. Beckles in a waterworn fragment of Wealden ironstone on the beach 

 near Hastings. It exhibits only remains of the head, which are very fragmentary 

 (Text-fig. 28). 



