CESTRACIONTIDiE. 
251 
1849. Ilijhodus plicatilis, II. von Meyer, Paloeontogpr. vol. i. p. 224, 
pi. xxviii. figs. 35, 30, 40. 
1849. Ilybodus mougeoti, II. von Meyer, tom. cit. p. 225, pi. xxviii. 
fig. 37. 
1849. Ilyhodas obtiquus, II. von Meyer, tom. cit. p. 227, pi. xxviii. 
fig- 41. 
(?) 1849. Ilybodus lonyiconm, II. von Moyer, tom. cit. p. 227, pi. xxviii. 
fig. 39. 
18-52. Ilybodus plicatilis, P. Gervais, Zool. et Pal. Fran^., Explic. PI., 
Poisson.s Foss. p. 12, pi. l.vxvii. tig. 3 (non figs. 1, 2, 4, 5). 
1850. Ilybodus plicatilis, C. Giebel, Zeitschr. gcsammt. Naturw. vol. viii. 
p. 420, pi. i. fig. 0. 
1837. Ilybodus plicatilis, 0. Chop, Zoitsclir. ge,sammt. Naturw. vol. ix. 
p. 128. 
1801. Ilybodus plicatilis, E. E. Schmid, Nova Acta Acad. Cses. Leop.- 
Car. vol. x.xix. no. 9, p. 18, pi. iii. figs. 7-12 (non figs. 1-0). 
1805. Ilybodus plicatilis, II. Eck, Form. hunt. Sandst. u. Mu.schelk. 
Oberschlesieii, p. 05. 
1806. Ilybodus lonyiconus, II. Eck, op. cit. p. 119 (in part). 
1870. Ilybodus plicatilis, F. Roemer, Geol. von Oherschlesien, pi. xii. 
tigs. 1.3, 14. 
1883. Ilybodus plicatilis, II. E. Sauvage, Pull. Soc. Geol. France, [3] 
vol. xi. p. 495, pi. xii. figs. 0-11. 
Type. Detached teeth. 
Teeth small, with a relatively high crown, strongly marked by 
vertical superficial wrinkles. The lateral denticle.s are two, three, 
or four in number on each side, well separated, elongate, and 
slender. 
Detached teeth only being known, it is impossible at present to 
determine the precise characters of the dentition of this species. 
The teeth named H. lonyiconus, Agass., maj' almost certainly be 
referred to the symphysial portion of the jaw; and Sauvage (loc. 
cit.) is inclined to think that II. anyustus, Agass., is founded upon 
posterior teeth of this species. Schmid (loc. cit.) also proposes to 
include Agassiz’s II. mouyeoti. If. anyustus, II. polynjphus, II. ohli- 
quus, II. cuspidalus, II. suhlcevis, and H. apicalis. IVithout a larger 
number of specimens, however, it does not appear justifiable to 
extend the synonymy beyond that given above. 
Form. ^ Loc. Muschclkalk : Upper Silesia, Bavaria, Wiirtemberg, 
Brunswick, Thuringia, Saxc-Weimar, Lorraine, and Eastern France. 
28464. Small posterior tooth; Bayreuth, Bavaria. PurcJia.'ied, 1853. 
1533. Similar tooth ; Bayreuth. Braun Coll. 
P. 2769, P. 2775. Two typical teeth, and one resembling II. lonyi- 
conus, Agass. ; Bayreuth. Enniskillen Coll. 
