524 
ACTINOPTERYGII. 
three-and-a-half and four time*? in the length of the trunk from the 
pectoral arch to the base of the caudal fin. Vertebrae and fins as 
in T. scilmoneus. 
Form. Sf Log. Lower Kimmeridgian (Lithographic Stone) : Ba¬ 
varia, and (?) Ain, France. 
37819. Large much-fractured specimen 0*25 in length ; Solenhofen. 
The number of vertebrae between the occiput and the 
hinder border of the operculum is shown to be six. 
Haberlein Coll. 
P. 3680. Less imperfect specimen 0-203 in length; Kelheim. 
Enniskillen Coll. 
37828. Somewhat smaller fish, in counterpart; Solenhofen. 
Haberlein Coll. 
P. 917 a. Fine specimen 0*175 in length, labelled Thrissopspropin- 
cpuus by Munster; Kelheim. Egerton Coll. 
P. 916. Another fine specimen nearly as large as the last, showing 
an undigested fish (apparently Leptolepis ) in the abdomen ; 
Solenhofen. Egerton Coll. 
P. 3680 a, b. Similar but contorted specimen, and a smaller fish; 
Kelheim. Enniskillen Coll. 
P. 915. Four smaller specimens ; Kelheim. Egerton Coll. 
P. 918, P. 921. Three imperfect specimens of the fish named 
Thrissops regleyi by Thiolliere, probably referable to this 
species; Girin, Ain, France. Egerton Coll. 
P. 4688. Similar fish 0-145 in length, preserved chiefly as an 
impression; Cirin. Purchased, 1884. 
P. 4689. Imperfect contorted specimen, in counterpart; Cirin. 
Purchased , 1884. 
The following small specimens are doubtless to be regarded as 
immature individuals of some or all of the three foregoing species. 
The head with opercular apparatus occupies somewhat more than 
one-fifth of the total length of the fish, and similar specimens have 
received the names of Thrissojps cejphalus (Agassiz, Poiss. Foss, 
vol. ii. pt. ii. 1844, p. 125, pi. lxi. figs. 1-3: Palaeontological 
Museum, Munich) and Thrissojps micrurus (Winkler, Katuurk. 
Verhandl. Holland. Maatsch. [2] vol. xiv. 1861, p. 14, fig. 2 : 
Teyler Museum, Haarlem). 
