826 
SUPPLEMENT. 
In this instance the relative diameters confirm previous measure- 
ments. 
“ The shell is ai> arently smooth or very finely striated, and 
extremely thin, as also are the septa. There is very little evidence 
of compression, and the original form seems to have been very 
nearly what it now is. 
“ In the longest diameter of the ellipse, the septa bend rapidly 
forward from the siphuncle till a little more than halfway to the 
external shell, where they make a gentle curve more directly 
towards the exterior, and before reaching it curve a little back- 
wards. In the opposite direction, the septa have but a simple 
curve. In this character the septa bear some resemblance to Gonia- 
tites.” {Hall.) 
RemarJcs. I have given HalFs description of the type species in 
full; he has described another — G. occidentale — in the Rep. of 
Progr. Wisconsin, 1861, but I have not access to this work. It is 
described in Scudder’s ‘ Cat. of Scientific Serials ’ under the title of 
“ Report of the Superintendent .... exhibiting the progress of 
the work; by Hall, &c. 1859-60 (1860-61), Madison. 2 n. 8®.” 
Horizon. Black River Pormation ( = Llandeilo Limestones?). 
Localities. Watertown, Jefferson County, Xew' York State. 
Canada. 
Fairly well represented in the Collection. 
Genus JOVELLANIA (Bayle ^), Foord. 
{Tripleiiroceras (pars), H}"att, 1883 ^ ; Gonioceras (pars), 
Zittel, 1884 \) ■ 
Gen. Char. This genus (together with several others) was pro- 
posed by Bayle in a communication to the Geological Society of 
France ; no description of it was given, but a type species — Ortho- 
ceras Buchi, de Yern. — was chosen to represent it. 
Hnder Jovellania I now propose to class the speeies which consti- 
tute the “ triangulare-gmn.^^ ” of Dr. Emanuel Kayser \ upon which 
I shall have some remarks to make later on. 
The present genus includes straight and usually slowly tapering 
shells, which have a sub triangular section ; the siphuncle is situ- 
^ Bull. Soc. Geol. de France, ser. 3, vol. vii. 1879, p. 91. 
’ Proc. Boston Soc. Nat, Hist. vol. xxii. p. 289. 
® Handb. der Palseontologie, Band i. Abth. ii. Lief. iii. p. 370. 
^ “ Die Fauna der altesten Devon-Ablagerungen des Harzes,” in the Abhandl. 
zur geol. Specialkarte von Preussen, Band ii. Heft iv. 1878, p. 65. 
