184 
6ELAC1UI. 
lively small antero-posterior measurement of the “ upper ” dental 
plate, are indicated by the following specimens : — 
23712. A small dental plate, shown, of the natural size, in PI. V'l. 
lig. 17 ; Lower Carboniferous Limestone, Hook Point, 
Wexford, Ireland. Ihmhased, 1849. 
P. 227 C. A larger eorrcsponding plate, with prominently-coloured 
transverse bands, shown, of the natural size, in PI. VI. 
fig. 18 ; Carboniferous Limestone, Orcton. 
Weavev-Joaes CoU. 
The following species have also been founded upon detached 
dental plates, but there are no c.^amiilcs in the Collect ion : — 
I'sejihodus crenidatus, St. John & Worthen, Pal. Illinois, vol. vii. 
(1883), p. 67 : Aspidodus crmulatiin, Aewbeiry & Worthen, 
Pal. Illinois, vol. ii. (1866), p. 93, pi. viii. figs. 3-1 1 ; also 
J. S. Newberry, Ann. Itei). (leol. Surv. Indiana, 1876- 
78 (1879), p. 341 : Afpidodum convolvlus, Newberry & 
Worthen, tom. eit. p. 94, pi. viii. fig. 12. — Chester Lime- 
stone; Illinois and Kentucky. 
Paepliodus dentaUts: Idelodus dent(itu.<s, JI. Romanowsky, Pull. 
Soc. Imp. ATit. Moscou, 1864, pt. ii. p. 159, pi. iii. figs. 12- 
16. — Lower Carboniferous Limestone; Government of 
Toula, Russia. ? Ifdodus i/entatus, L. G. do Koninck, 
Faune Calc. Carbf. Relg. pt. i. (1878), p. 40, ))1. iv. fig. 18. — 
Lower Carboniferous Limestone; Tournai, Relgium. 
I'sephodus indicus, W. Waagen, Pal. Ind. ser. 13, pt. ii. (1880), 
p. 73, pi. vii. figs. 3, 5. — IToductus Limestone ; Salt Range, 
India. 
I’sephodus latiis, St.John & Worthen, op. oil. vol. vii. p. 72, pi. ii. 
figs. 1-3. — St. Louis Limestone; Illinois, Jlissouri. 
Psephodus minor, II. Trautschold, Mem. Soc. Imp. Nat. Moscou, 
vol. xiv. (1879), p. 57, pi. vii. figs. 9, 10 ( non figs. 1 1, 12). 
Carboniferous Limestone ; Mjatschkowa, iMoscow. 
Psejihodus ohliquus, St. John & IVorthen, op, eit. vol. vii. p. 66, 
pi. i. figs. 1-5. — Kinderhook Limestone ; Iowa. 
1 sc^'hodus plactntu, St. John iSc Worthen, op. eit. vol. vii. p. 69, 
pi. ii. figs. 5-8 ; Ileloilns plucnita, Newberry & Worthen, 
op. cit. vol. ii. p. 80 ^ jjP y_ 4 — Kinderhook Lime- 
stone ; Iowa. 
Psephodus lyularis : Ta-niodos ree/nluris, St. John & Worthen, 
op. cit. vol. vii. p. 77, pl. xiii. fig. 11. — Warsaw Lime- 
stone ; Indiana. 
