300 GASTEROPODA OF THE INFERIOR OOLITE. 
235. Lirrorina (? Trochus) Pisouitica, sp. nov. Plate XXIV, fig. 9. 
Description : 
Length . 5 . 4—5 mm. 
Length of body- wheel to total height . - 92,100, 
Opening of the spiral angle . : AU ss 
Shell small, trochiform, spiral angle convex, sutures distinct. Number of 
whorls five, apex obtuse and smooth; remaining whorls convex, and ornamented 
by five spirals, decussated at the nodes by axial lines which produce a subreticu- 
late structure ; the anterior spiral slightly prominent. 
Body-whorl large, subangular, with six spirals; base rather flattened, and 
with about seven nearly smooth spirals. Aperture subcircular, pillar-lip very 
short and with but little callus. 
Relations and Distribution.—Failing to recognise any corresponding adult 
form, I am disposed to conclude that “ Littorina”’ pisolitica is a variable micro- 
morph, which seems to be related to species described under Littorina, but which 
may really be a Trochus. 
Occurs in the Pea-grit at Crickley and Leckhampton. 
N.B.—The two remaining species described under Littorina are cylindro- 
conical forms which resemble Tvrochus. 
236. Lirrortina (? Trochus) reorerLanata, Tawney, 1873. Plate XXIV, figs. 6 
and 7. 
1873. Lirrrortya RecTEPLANATA, Tawney. Dundry Gasteropoda, p. 24 (16), 
pl. ii, fig. 6. 
Description : 
Length . 5 . 13—20 mm. 
Length of body. wiorl to fotal height . . 40: 100. 
Spiral angle : .  40°—45°, 
Shell cylindro-conical, spire poitod: N tinber of whorls probably seven, flat 
and well separated by the suture. The ornaments consist of four closely tuber- 
culated spirals, of which the anterior is the strongest and forms a slight salience ; 
sometimes a fifth spiral may be noted in the gape of the suture; axial cost 
sharply defined throughout. 
Body-whorl angular, with four or five spirals much tuberculated, the fourth 
spiral constituting a carina at the angle; base subconvex, with five almost plain 
spirals. Aperture trapezoidal, with a thick columellar lip. 
