ASPIDOEHTNCHIDxE. 
425 
37319. Eostrum in side view, well displaying the premaxillary 
Purchased , 1863. 
dentition. 
21430-a. T wo small rostra. 
46350. Two ectopterygoid bones 
Purchased , 1847. 
Cunnington Coll. 
Purchased , 1847. 
Purchased , 1854. 
21430 b. Another ectopterygoid. 
29045. Large maxilla and two fragments. 
29045 a. Maxilla, shown of the natural size in PI. XYIT. fig. 8. 
Purchased , 1854. 
46349. Small maxilla. Cunnington Coll. 
40519, 41296, 42295, 46412. Six detached dentary bones, the 
largest shown of the natural size in PI. XYII. fig. 9. 
Purchased , 1867", 1869, 1870, 1875. 
P. 967 d. Eight dentary bone. Egerton Coll. 
21430 c, 24676, 29047. Pour splenial bones, one shown of the 
natural size in PI. XYII. fig. 10. 
Purchased , 1847, 1850, 1854. 
Aspidorhynchus sphekodes, Sauvage. 
1893. Aspidorhynchus sphekodes, H. E. Sauvage, Bull. Soc. Hist. Nat. 
Autun, vol. vi. p. 431, pi. viii. fig. 1. 
Type. Pish wanting paired fins. 
A much-elongated species attaining a length of about 0-3. Head 
with opercular apparatus occupying about one-quarter of the total 
length ; maximum depth of trunk contained considerably more than 
ten times in the total length. Eostrum slender, projecting in 
advance of the mandible for a length equalling about one-third 
that of the cranium ; cranial roof-bones rugose and in part tuber- 
culated. Scales smooth. 
Form, Loc. Lower Kimmeridgian : Orbagnoux, Ain, Prance. 
Not represented in the Collection. 
Aspidorhynchus fisheri, Egerton. 
1854-55. Aspidorhynchus Jisheri, Sir P. Egerton, Ann. Mag. Nat. Hist. 
[2] vol. xiii. p. 434, and Figs. & Descript. Brit. Organic Eemains, 
dec. viii. (Mem. Geol. Surv.), no. 6, pi. vi. 
1880. Aspidorhynchus Jisheri, A. Giinther, Study of Pishes, p. 369, 
fig. 146. 
Type. Nearly complete fish ; Dorchester Museum. 
A species attaining a length of about 0 - 35-0 - 4. Head with 
