EI0PIM). 
29 
displaying suborbifcals, the plate above the operculum, and 
part of the gular plate. 
Presented by the Hon. Robert Marsliam, 1877. 
P- 9189. Smaller and more imperfect head with abdominal region, 
showing enlarged scale above pectoral fin. 
History unknown. 
15486. Still smaller head and remains of trunk. 
Purchased from Mr. Gardner. 
47900. Imperfect small trunk in counterpart, the axial skeleton 
noticed loc. cit. p. 537. 
Presented by the Hon. Robert Marsham, 1877. 
1962 c, P. 3986 a. Small head and abdominal region in counter- 
part, doubtfully of this species. 
Egerton Sf Enniskillen Colls. 
274. Portion of small trunk in counterpart, doubtfully of this 
species, showing scale-ornament. 
Transferred from Museum of Practical Geology, 1880. 
Iho following specimen seems to bolong to Notelops, but its 
generic determination is uncertain : — 
47899. Pine large trunk, in counterpart, showing portions of all 
tho fins. Presented by the Hon. Robert Marsham, 1877. 
Genus RHACOLEPIS, Agassiz. 
[Edinb. Now Phil. Journ. vol. xxx. 1841, p. 83 (Phacolepis).] 
Irunk somewhat laterally compressed; abdomen flattened or 
rounded. Parietal bones small and separated by the supraoccipital ; 
no deep depression in hinder part of frontal region ; gape of mouth 
extending to the hinder border of the orbit ; a singlo supramaxillary 
bone ; margin of the jaws with a single serios of small conical 
teeth. Operculum simplo ; branchiostegal rays about 20 in 
number. Vertebral centra slightly constricted, smooth or delicately 
striated, perforated for the passage of a remnant of the notochord. 
1 ectoral fin with a largo and elongated scale at its base ; dorsal fin 
wore or less directly opposed to the pelvic pair; anal smaller than 
the dorsal fin ; caudal fin deeply forked. Scales usually ornamented 
With delicate radiating ridges; a few very small, thin scales 
extending over tho caudal fin ; lateral line inconspicuous. 
Tbe gular plate in this genus has not yet been clearly observed. 
