ETJGNATHID2E. 
321 
Ptycholepis curta, Egerton. 
[Plate X. fig. 1.] 
1854-55. Ptycholepis curtus, Sir P. Egerton, Ann. Mag. Nat. Hist. [2] 
vol. xiii. p. 435, and Figs. & Descript. Brit. Organic Remains, 
de£. viii. (Mem. Geol. Surv.), no. 8, pi. viii. Sup pi. p. 1. 
Type. Crushed fish ; British Museum. 
A stout species of moderate size, the length of the head equalling 
the maximum depth of the trunk and contained about three-and-a- 
half times in the total length. Pelvic fins opposed to the hinder 
portion of the dorsal; anal fin very small and remote. External 
bones and fin-rays ornamented as in the type species ; the scales 
differing in the presence of a few conspicuous vertical folds of 
ganoine at the anterior overlapped border. 
Form. 6f Log. Lower Lias: Dorsetshire. 9 p/3<*-e/en 
P. 6334. The type specimen, apparently somewhat shortened by 
crushing ; Lyme Regis. A few ossified vertebral rings, 
with their robust hmmal arches, are seen at the base of 
the tail. Beckles Coll. 
39493. A more satisfactorily preserved fish, shown of the natural 
size in PL X. fig. 1; Lyme Regis. The caudal pedicle is 
accidentally elongated and the hinder portion of the 
dorsal fin is wanting, but the specimen is otherwise 
nearly complete. The maxilla distinctly shows a series of 
minute conical teeth, while the characteristic form of the 
operculum and suboperculum may be observed. The 
uppermost branchiostegal ray is conspicuously ornamented. 
Purchased , 1865. 
P. 3692. Imperfect example of a similar fish, evidently the second 
specimen described by Egerton, loc. cit. Suppl. p. 1; Lyme 
Regis. Portions of the smooth branchiostegals and gular 
plate are shown; and there is evidence of biserial fulcra 
on the pectoral fin. Enniskillen Coll. 
P. 3692 a. A small, much-abraded specimen; Lyme Regis. 
Enniskillen Coll . 
P. 859 a. Imperfect remains of head and squamation; Lyme 
Regis. Many of the scales are exposed from within, and 
demonstrate the absence of an internal rib. 
Egerton Coll . 
PART III, 
Y 
