312 
ACTINOPTERYGir. 
Heterolepidotus pectoralis (Bellotti). 
1857. Lepidotuspectoralis, C. Bellotti, in A. Stoppani, Studii Geol, e 
Paleont. Lombardia, p. 420. 
1889. Heterolepidotus pectoralis , W. Deecke, Palaeontogr. vol. xxxv, 
p. 114, pi. vi. fig. 8, pi. vii. fig. 10. 
Type. Imperfect fish ; Milan Museum. 
A species attaining a length of about 0*16. Length of head with 
opercular apparatus exceeding the maximum depth of the trunk and 
occupying one-third of the total length of the fish; width of caudal 
pedicle contained about two-and-a-quarter times in the maximum 
depth of the trunk. External bones conspicuously ornamented with 
granulations, which are sometimes fused into rugse; scales smooth, 
those of the anterior part of the trunk finely serrated ; principal 
flank-scales about as deep as broad. ( Deecke .) 
Form. Sf Loc. Upper Trias : Perledo, Como. 
Not represented in the Collection. 
Heterolepidotus serratus (Bellotti). 
1857. Lepidotus serratus , C. Bellotti, in A. Stoppani, Studii Geol. e 
Paleont. Lombardia, p. 419. 
1889. Heterolepidotus serratus , W. Deecke, Palseontogr. vol. xxxv. 
p. 116, pi. vi. fig. 2. 
Type. Nearly complete fish ; Milan Museum. 
A species closely related to the preceding but somewhat more 
elongated, and the ornament of the external bones entirely tuber¬ 
cular, not rugose. Head with opercular apparatus occupying some¬ 
what more than one-quarter of the total length of the fish ; width 
of caudal pedicle contained about two-and-a-half times in the 
maximum depth of the trunk. (Deecke.) 
Form. Sf Loc. Upper Trias : Perledo, Como. 
Not represented in the Collection. 
Heterolepidotus (?) radiato-punctatus (Agassiz). 
1844. Pholidophorus radiato-punctatus , L. Agassiz, Poiss. Foss. vol. ii. 
pt. i. p. 287. 
1844. Pholidophorus maximus, L. Agassiz, ibid. p. 287. 
Type. Bemains of head and trunk; British Museum. 
A large species characterized by comparatively robust scales, 
which are not much deeper than broad on the flank, and are all 
ornamented with small tubercles of ganoine, usually more or less 
elongated and closely arranged in lines radiating from the anterior 
