PYCNODONTIDiE. 227 
following species is named Microdon intermeclius, A. Wagner, 
Gelehrte Anzeig. k. bay. Akad, Wiss. vol. 1. (1860), p. 398. 
Form . Sf Log. Lower Kimmeridgian (Lithographic Stone): Cirin, 
Ain, France. 
Not represented in the Collection. 
Microdon itieri (Thiolliere). 
1850. Pycnodus itieri , V. Thiolliere, Ann. Soc. Sci. Pliys. & Nat. Lyon, 
[2] vol. iii. p. 132. 
1854. Pymodus itieri , V. Thiolliere, Poiss. Foss. Bugey, pt. i. p. 22, 
with plate and woodcut of dentition. 
1856. Microdon itieri , J. J. Heckel, Denkschr. k. Akad. Wiss., math.- 
naturw. Cl. vol. xi. p. 201. 
1860. Microdon itieri , A. Wagner, Gelehrte Anzeig. k. bay. Akad. 
Wiss. vol. 1. p. 396. 
Type. Nearly complete fish; Lyons Museum. 
A moderately elongated species attaining a length of about 0*5. 
Maximum depth of trunk contained three times in the length of the 
head and trunk without caudal fin; head with opercular apparatus 
occupying only about one-fifth of the total length of the fish. Yome- 
rine teeth closely arranged ; those of the median series much broader 
than long; those of the inner paired series elongated and their 
axis oblique, each pair alternating with the median teeth but 
scarcely pressed between these; outer teeth irregularly quadrate, 
about as broad as long, and very closely arranged. Splenial teeth 
(according to Thiolliere’s diagram) much spaced; those of the 
principal series two or three times as broad as long, rounded at each 
end; those of the innermost series minute, and those of the two 
flanking series somewhat broader than long, the outer twice as 
large as those of the inner flanking row. Dorsal fin occupying 
about half of the back, and anal fin more than two-thirds as much 
extended as this. Scales apparently confined to the most anterior 
portion of the trunk. 
Form. Sf Log. Lower Kimmeridgian (Lithographic Stone) : Cirin, 
Ain, France. 
Not represented in the Collection. 
Microdon hugii (Agassiz). 
[Plate XYII. fig. 3.] 
1833-44. Pycnodus hugii, L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 17, 
pt. ii. p. 195, pi. Ixxii. a. figs. 49-54. 
1846. Pycnodus bucklandi , G. von Munster {errore), Beitr. Petrefakt. 
pt. vii. p. 40, pi. iii. figs. 5 a, b. 
1846. Pycnodus preussi, G. von Munster, ibid. p. 45, pi. ii. fig. 25. 
[Splenial; Palaeontological Museum, Munich.] 
0,2 
