ACTINOPTEEYGII. 
Elopopsis heckeli, Eeuss. 
18o7. Elopopsis heckeli, A. E. Eeuss, Denkschr. k. Akad. Wiss., math.- 
naturw. CL vol. xiii. p. 39, pi. iii. 
1878. Elop)opsis heckeli, A. Fritscli, Eept. u. Fische bohm. Kreideform. 
p. 41, tig, 61. 
Type. Head; Eoyal Bohemian Museum, Prague. 
A species known only by the head and a fragment of the anterior 
abdominal region, the mandible measuring 0*13 in length. Length 
of head with opercular apparatus exceeding the maximum depth of 
the trunk; depth of head at occiput not quite equalling the length 
of the cranium. Dentigerous border of maxilla slightly convex; 
teeth increasing in size towards the hinder end of each jaw, all 
considerably expanded at the base. 
Form. Log. Cenomanian : Prague, Bohemia. 
Not represented in the Collection. 
Elopopsis crassus (Dixon). 
1850. Osmeroides crassus, F. Dixon, Geol. Sussex, p. 376. 
1888. Osmeroides crassus, A. S. Woodward, Proc. Geol. Assoc, vol. x. 
p. 322. 
1895. Elopopsis crassus, A. S. Woodward, Proc. Zool. Soc. 1894, p. 659, 
pi. xliii. tig. 1. 
Type. Head; Brighton Museum. , 
An imperfectly known large species, the mandible measuring 
about 0*09 in length. Depth of head at occiput at least equalling 
the length of the cranium. Premaxilla elongate-triangular in shape, 
bearing a close series of small conical teeth on its oral border and 
two much-enlarged, laterally-compressed teeth within; dentigerous 
border of maxilla convex, with a regular series of small stout teeth, 
not increasing in size backwards; mandible rapidly tapering to 
an almost pointed symphysis, with relatively large, widely-spaced 
teeth, of which the largest seem to be in front. 
Form. ^ Log. Turonian : S.E. England. 
P. 1169. Imperfect head, with fragments of trunk; Chalk, Kent. 
Egerton Coll. 
The following species is known only by an imperfect head much 
resembling E. orassus :— 
Elopopsis ziegleri, W. von der March, Palaeontogr. vol. xv. (1868), 
p. 293, pi. xli. figs. 2-4.—Cenomanian; Wessum, near 
Ahaus, Westphalia. [Head, etc. ; olim Ziegler Coll., 
Ahaus.] 
