LEPTOLEPIDiE. 
523 
1844. Thrissops mesogaster , L. Agassiz, ibid. vol. ii. pt. ii. pp. 128,293. 
[Nearly complete fish; Palaeontological Museum, Munich.] 
1848. Thrissops gracilis, C. G. Giebel, Fauna d. Vorw., Fische, p. 151. 
[Nearly complete fish ; Halle University Museum.] 
1848. Thrissops salmoneus, C. G. Giebel, ibid. p. 152. 
1848. Thrissops mesogaster, C. G. Giebel, ibid. p. 152. 
1863. Thrissops salmoneus (including yar. angustus, Munster, MS.), 
A. Wagner, Abh. k. bay. Akad. Wiss., math.-pkys. Cl. vol. ix, 
p. 735. 
Type. Nearly complete fish ; Museum of Natural History, Paris. 
A species attaining a length of about 035. Head with opercular 
apparatus occupying about oue-sixth of the total length of the fish; 
maximum depth of trunk less than the length of the head with 
opercular apparatus, and contained about five times in the length of 
the trunk from the pectoral arch to the base of the caudal fin. 
Vertebrae and fins as in the type species, except that the caudal is 
much less deeply forked and with broader lobes. 
Form, Sf Loc. Lower Kimmeridgian (Lithographic Stone) : Ba¬ 
varia. 
37078. Contorted specimen about 0335 in length, in counterpart; 
Solenhofen. Eaberlein Coll. 
P. 3679. Fine specimen somewhat fractured, 0-27 in length, 
labelled Thrissops mesogaster by Agassiz ; Eichstadt. 
Enniskillen Coll. 
37069. Similar specimen 0’25 in length, in counterpart; Solen¬ 
hofen. Haberlein Coll. 
P. 3682. A smaller, more imperfect fish, labelled Thrissops angustus 
by Munster ; Kelheim. Enniskillen Coll. 
Thrissops clupeoides, Winkler. 
(P) 1854. Thrissops regleyi, V. Thiolliere, Poiss. Foss. Bugey, pt. i. pi. x. 
fig. 2 (figure only). 
1861. Thrissops clupeoides, T. C. Winkler, Descript. Poiss. Foss. 
Solenhofen (Natuurk. Verhandl. Holland. Maatsck. [2] vol. xiv.), 
p. 21, fig. 3. 
Type. Nearly complete fish ; Teyler Museum, Haarlem. 
A species attaining a length of about 0‘25. Head with opercular 
apparatus contained between five and five-and-a-half times in the 
total length of the fish; maximum depth of trunk equalling the 
length of the head with opercular apparatus, contained between 
