398 
SUPPLEMENT. 
Group ii. section ii. of Barrande’ {=Jovdlania of Bajle), which 
includes forms characterized by the triangular contour of their 
transverse section, their numerous air-chambcrs, and by the radiating 
lamellae filling their siphuncle and representing tlie organic deposit. 
M. Barrois adds that this section has for its type the Ortlioceras 
triangulare, d’Arch. and de Yern.^, and comprehends the following 
forms : — 
Ortlioceras Arcliiaci, Barr.^, 
victor^ Barr.\ 
Jovdlani, Yern/, 
trl.angulai'e, Bmmer®, 
Buchii, Yern.^, 
Losseni, Kayser 
Kodii, Kayser® ; 
and to these may be added some of the species enumerated under 
my description of Jovellania^^ ^ viz. Ortlioceras Marraiji^ Billings”, 
0. cajntolinum^ Salford'®, and (1) Gomphoceras'’ Heiiperis, Eich- 
wald'®. 
I must here point out that in constituting Ortlioceras triangulare, 
d’Arch. and de Yern.” (not lloemer), as the type of Jovellauia, 
M. Barrois is in error, since Bayle himself selected 0. Bachi, Yern., 
as the type”. 
I cannot agree with M. Barrois’s allocation of Jovdlania as a 
subgenus of Ortlioceras^ as I share the opinion expressed by Kayser” 
^ Syst. Sil. de la Eoheme, vol. ii. pt. iii. 1874, p. 102, pi. celi. 
2 Trans. Geol. Soc. ser. ii. vol. vi. 1842, p. 347, pi- xxvii. ligs. 1, 1 a. 
^ Syst. Sil. de la Boheme, vol. ii. pt. iii. 1874, p. 102. 
4 Ibid. p. 104. 
° Bull. Soc. Geol. de France, 1845, ser.ii. vol. ii. p. 401, pi. xiii. figs. 1 a, 1 6, 2. 
® Beitr. z. Kenntn. des nordvvestl. Hartzgebirges, 1850, p. 04, Taf. x. [mis- 
printed V. in text] figs. 0. a, b. 
Bull. Soc. Geol. de Fjance, 1850, ser. ii. vol. vii. p. 778. 
® Abhandl. zur geol. Specialkarte von Preussen, Band ii. Heft iv. 1878, p. 08, 
Taf. ix. fig. 1. 
9 Ibid. p. 69, Taf. ix. fig. 3. 
Cat. Foss. Ceph. British Museum (Nat. Hist.), 1888, pt. i. p, 327. 
Geol. Surv. Canada, Kep. of Progr. for the years 1853-1856 (1857), 
p. 332. 
Geol. of Tennessee, 1869, p. 290, pi. iv. (G 3) figs. 1 a, 1 6 (excl. 1 c). 
Leth. Boss. vol. i. p. 1270, pi. xlix. figs. 4 a-c and 8 a-c. 
Trans. Geol. Soc. ser. ii. vol. vi. 1842, p. 347, pi. xxvii. figs. 1, 1 a. 
Bull. Soc. Geol. de France, ser. iii. vol. vii. Jan. 1879, p. 91. 
Abhandl. zur geol. Specialkarte von Preussen, Band ii. Heft iv. 1878, p. 60. 
