CYCLOPHORID &. 
aa) 
On 
3. ALYCEUS CONSTRICTUS. 
Shell perforate, ovate-conic, smooth, with narrow, distant, oblique 
ribs, translucent, whitish or reddish-brown; spire elongate- 
conical, with the apex blunt; suture much impressed; whorls 4, 
rounded, the upper ones smooth, the following distantly ribbed, 
the last one sculptured with very crowded rib-like striz, stran- 
gulated behind the aperture, and broadly contracted anteriorly ; 
with a retroversed sutural callus, like L. strangulatum, behind 
the constriction; aperture perpendicular, circular, equalling 
2 of the whole length; peristome reflected all round. Oper- 
culum shelly, many-whorled, with the suture inconspicuous. 
Height 33, breadth 2 mill. 
Cyclostoma constrictum, Benson, in Ann. and Mag. 2nd. ser. viii. 
1851, p. 188; Pfr. Ic. n. 408, t. 49, f. 26-28. 
Alyceeus constrictus, Pfr. Consp. n. 177; Pneum. Mon. p. 120. 
Hat. Darjiling, Sikkim-Himalayah. 
VIII. DIPLOMMATINA. 
Operculum shelly, thin ; whorls few, with thin prominent lamelle 
on their external edges. Shell scarcely rimate, thin, subovate ; 
whorls convex, last subascendant; aperture nearly circular ; 
peristome interrupted, expanded. 
Diplommatina, Benson, in Ann. and Mag. 1849, Sept. p. 193; 
Gray, Catal. Cycloph. p. 54; Pfr. in Z.£. M. 1851, p. 147 ; Consp. 
p- 19; Pneum. Mon. p. 121. 
Carychii spec., Hutton, Boys. 
Cyclostomatis spec., Sow. 
Bulimi spec., Pfr. olim. 
1. Diptommatina ? SowERBYI. B. M. 
Shell subimperforate, ovate-oblong, very thin, smooth, shining, 
yellowish-glassy ; spire ovate, with the apex blunt; whorls 5, 
inflated, the upper ones slightly ribbed, the penultimate 
broadest ; aperture vertical, nearly circular; peristome white, 
shortly expanded, with the margins almost contiguous; colu- 
mellar margin angularly dilated in the middle. Operculum? 
Length 53, breadth 3} mill. 
Cyclostoma minus, Sow. in Proc. Z. S. 1843, p. 65; Thes. n. 175, 
p. 150, t. 30, f. 249 (magnified); Pfr. lc. n. 101, p. 108, t. 17, 
f. 9-11. 
Diplommatina? minus, Gray, Cat. Cycl. p. 35, n. 3. 
Diplommatina? minor, Pfr. Consp. un. 178. 
Diplommatina? Sowerbyi, Pfr. Pnewm. Mon. p. 121. 
Hab. Philippine Islands of Panay and Zebu (H. Cuming). 
I 
