AMMODYTIDJE. 
355 
Cobitopsis acutus (Gervais). 
[Text- figure 12.] 
1852. Acanthopsis acutus, P. Gervais, Zool. et Pal. Fran?., Poiss.. 
p. 9, woodc. 
1853. Cobitopsis exilis, A. Pomel, Catal. Method. Vert. Foss. Loire, 
- P ' 134 ’ 
1874. Cobitopsis acutus, H. E. Sauvage, Bull. Soc. Hist. Nat. Toulouse, 
vol. viii. p. 196. 
type. Imperfect fish. 
The type species, attaining a length of about O'l. Length of 
bead with opercular apparatus equalling a little more than twice 
the maximum depth of the trunk and slightly less than one third 
op the total length of the fish to the base of the caudal fin. 
Fig. 12. 
Cobitopsis acutus ; restoration, about nat. size. 
Pectoral fins with about 10 rays; pelvic fins inserted midway 
e tween the pectoral and caudal fins ; dorsal and anal fins slightly 
elevated in front, each with 16 to 18 rays. 
Form. $ Loc. Lower Oligocene : Puy-de-Dome, France. 
32485 . Two fine specimens : St. Amand-Tallende, near Clermont 
Ferrand. The head and opercular bones are smooth, and 
the few branchiostegal rays are preserved. The articu- 
lation of the mandible is beneath the middle of the large 
orbit. The vertebral centra arc shown to be delicate 
constricted cylinders, apparently pierced originally by the 
notochord : they are strengthened by slight longitudinal 
ridges only in tho caudal region. The ribs are short, 
straight, and delicate. Tho short neural spines in the 
abdominal region are thickened, those near the occiput 
being small expanded laminae. The pectoral fin has an 
extended base-line and is acuminate in shape ; the pelvie 
fin is not more than half as large as the pectoral. 
Although the specimens are so well preserved, there are 
no traces of scales. Purchased. 
2a 2 
