OF SOUTHERN INDIA. 255 
Gabb (Pal. Calif., 1864, I, p. 120) lately described two new species, S¢. paucivolvus and lens, of 
which the second approaches rather more to Discohelia, but in neither of them have the strix of growth 
been observed. Meek (Smith. Misc. Coll., No. 177, 1864, Check list of erét, foss., p. 18) mentions 
two doubtful species from Alabama, Strap. Japidosus and sub-planus of Gabb. 
We have to add one species from South India, Strap. indicus, n. sp., a smooth, discoid shell 
with the striz bent distinctly forward on the outer periphery. 
b. The genus Bifrontia ought to be accepted in the sense proposed by 
Deshayes in the first edition of the Paris fossils. The principal characters con- 
sist in the discotdal form, in the angular shape of the whorls, the last of which és often 
partially or wholly uncoiled from the others, in the narrow emargination near the 
suture, m the crenulations of the wnbilical edge, and in a broad insinuation of the 
basal portion of the outer lip. 
The two species, lately added by Deshayes, Bif. ammonoides and Deshayesi, 
may better be transferred to Straparolus, especially on account of the want of the 
erenulated edges of the umbilicus, and on account of the outer lip being pro- 
duced in the middle or on the periphery of the whorls, not above as in typical 
Bifrontie. We had no occasion to examine any of the characteristic species of 
Bifrontia described by Deshayes, but if the two last mentioned species eannot be 
separated from the others, the entire genus Bifrontia must be abandoned, because 
it would be impossible to give any distinctions from Straparolus. 
Beside the eocene species of Bi/rontia there was also one miocene species referred to this genus by 
Michelotti. We have, however, already remarked, that this one probably belongs to Discoheli« 
(vide p. 251). 
LV. SOLARIUM,—Zamarck, 1799. 
1. SoLarivuM arcoTensE, Stoliczka, Pl. XIX, Fig. 29. 
Sol. testa orbiculata, spira paulo-elevata ; anfractibus quadrangulatis, ad peri- 
pheriam obtuse carimatis, in superficie striatis: supra duabus striis spiralibus prope 
suturam positis, una prope peripheriam, ceteris fere equalibus ornatis; striis inere- 
menti supra valde arcuatis, infra prope rectis; wmbilico latissimo, ad marginem 
carinato atque crenulato; apertura quadrangulari, ad marginem columellarem 
angustata. 
A small almost discoidal shell, being slightly convex above and largely umbili- 
eated below. The whorls are numerous, obtusely angulated at the periphery and 
crenulated on the edge of the umbilicus. The entire surface is spirally striated. 
Of the spiral strie two near the suture, and one towards the periphery, are 
considerably stronger than the rest. The striz of growth are distinctly curved 
S-form above, but nearly straight below. The aperture is oblique and angular, being 
less high on the columellar margin, than at the periphery. Iam not acquainted with 
any similar species from cretaceous beds, but there are some such largely umbili- 
cated forms known from the tertiaries, like Sol. millegranum, Lamk. 
Locality—Ninnyoor, in white, soft, calcareous beds; very rare. 
Formation.—Axrialoor group. 
