288 CATALOGUE OF PHANEROPNEUMONA. 
narrow reflected ; keel of young specimens winged with agglu- 
tinated decomposed particles of rocks. Operculum shelly, trape- 
zoldally semiovate. Height 93, greatest breadth 17, least br. 
15 mill. 
Helicina agglutinans, Sow. in Proc. Z. S. 1842, p. 7; Thes. n. 52, 
p. 11, t. 2, f. 83-85; Reeve, Conch. Syst. ii. t. 186, f. 11, 12; Pfr. 
Le. n. 75, p. 56, t. 2, f. 16-18 ; Pnewm. Mon. p. 394. 
Hab. The Philippine Islands of Guimaras, Bohol, Panay (H. 
Cuming). 
130. HenicINA ACUTISSIMA. B. M. 
Shell depressed-conic, rather solid, closely striated, obliquely opaque, 
uniformly yellow or painted with several red bands ; spire broadly 
conic, pointed ; whorls scarcely 5, flat, sharply keeled, the last 
very little descending below the keel; aperture very oblique, 
quadrangular, of the same colour within ; columella short, di- 
lated, with a very indistinct knot at its external extremity; 
peristome expanded, angulated on the right side, upper margin 
thin, basal margin somewhat thickened; basal callus thin, 
diffused. Operculum shelly, trapeziform. Height 53-82, greatest 
breadth 94-16, least br. 14 mill. 
Helicina acutissima, Sow. in Proc. Z. S. 1842, p.6; Thes. n. 48, 
p. 10, t. 2, £. 92-95; Reeve, Conch. Syst. t. 186, f. 2; Sow. Conch. 
Man. Ed. ii. f. 532, 533; Pfr. Ic. n. 76, p. 57, t. 2, f. 7-11; 
Pneum. Mon. p. 395. 
Hab. The Philippine Islands of Bohol, Siquijor, Zebu (H. Cuming). 
131. HEeLicInA OXYTROPIS. 
Shell depressed-turbinate, solid, keeled, slightly striated and 
wrinkled, opaque, pale yellow; spire shortly conoidal, with the 
apex very pointed; suture bordered; whorls 53, rather flat- 
tened, last keeled compressedly and sharply, moderately convex 
beneath ; aperture very oblique, lunate, rather triangular; 
columella declivious, angularly terminating outward, dilated 
backwards into a thin callus; peristome sharp, spreading nar- 
rowly. Operculum thin, shelly, rather trapeziform. Height 5, 
greatest breadth 12, least br. 10 mill. 
Helicina oxytropis, Gray, in Zool. of Beech Voy. p. 146, t. 38, 
f.24; Pfr. Pneum. Mon. p. 395. 
Helicina oxystoma, Sow. Thes. n. 50, p. 10, t. 3, f. 139. 
Locality unknown. 
132. HELICINA PALLIDA. 
Shell lenticular, rather solid, yellowish-gray, striated inequally, 
covered with a very thin periostraca; spire depressed ; whorls 
