CEPHALopopa. | LOWER PAL/EOZOIC MOLLUSCA. 323 
Position and Locality—Not uncommon in the mudstone and nodules of the Lower Ludlow rock at 
Garden Quarry, Aymestry, Herefordshire. 
Genus. LITUITES (Breyn). 
Gen. Char.—Shell spiral ; last chamber produced, straight ; whorls in contact on one plane; septa simple ; 
siphon central ; section circular. 
Differs from Hortolus only by the whorls of the spire being in contact. 
LITUITES ARTICULATUS (Sov.) 
Ref.—Sil. Syst. t. 11. f. 5 and 7. 
Sp. Ch.—Volutions about three, compressed, crossed by numerous ring-like coste, whose distance nearly 
equals their thickness; diameter of whorled portion one and a quarter inch (Sow.). Straight portion long, 
six lines in diameter, girt with narrow prominent rings, two and half lines apart, the wide intervening concave 
spaces being smooth. I have not myself seen the whorled portion, but the slightly curved terminal portion 
is easily distinguished from the Orthoceras ibex or O. reticulatum, by the wide intervening spaces between the 
narrow ridges. 
Position and Locality—Not uncommon in the Lower Ludlow rock of Garden Quarry, near Aymestry, 
Herefordshire ; sandy Wenlock shale, near Welchpool, Montgomeryshire. 
LITUITES CORNUARIETIS (Sov.) 
Ref.—Sow. Sil. Syst. t. 20. f. 20. 
Sp. Ch.—Discoid, volutions about four, diameter three inches nine lines, diameter of last whorl one inch 
two lines (compressed specimens) ; surface covered with numerous narrow ridges, curving outwards and back- 
wards on the sides, about one line apart on the last whorl, about two-thirds of a line apart on the penultimate 
whorl, with numerous close, minute, scaly, flexuous, intervening strie, having the same general direction ; edges 
of septa nearly even, siphon a little on the inner side of the centre. 
The very large specimen which I describe seems to have no straight anterior portion, or if there be a 
separation of the kind it must be very short and obscured by the crushing: it would incline me strongly 
(with general resemblance in other respects) to put the species in the genus T’rocholites, were it not for the 
nearly central siphon, which, as well as the rather fewer and more rapidly expanding whorls, distinguishes it 
from the American Trocholites ammonius of Conrad. 
Position and Locality —Coniston (Upper Bala) limestone, Coniston, Lancashire. 
Genus. TROCHOLITES (Conrad). 
Gen. Char.—Shell discoid, whorls exposed, in contact ; septa simple, or with a slight dorsal lobe ; siphon 
at or near the inner edge. 
Differs from Clymenia by wanting the lateral angulation of the septa, but includes several of Miinster’s 
species which want that angulation, 
TROCHOLITES ANGUIFORMIS (Salt. Sp.) Pl. 1. L. fig. 26. 
Syn. and Ref. = Lituites anguiformis (Salt. in Appendix.) 
Sp. Ch—Whorls about four ; sides slightly flattened, each longer than wide ; septa with a shallow back- 
ward wave on the sides, and a shallow lobe or backward wave on the exterior or periphery, the two intervening, 
forward, shallow sinuses being obtusely rounded. Diameter three inches four lines, length of mouth 3, width 
of mouth ;5,; septa in middle of last whorl two lines apart. 
This is easily distinguished from the American 7. ammonius and T. planorbiformis (Conrad), by the 
nT 2 
