ACICULIDA. 303 
Sect. Il. OPISOPHTHALMA. 
Eyes on the upper part of the head, behind the base of the tenta- 
cula. Head with a rather produced aculeated proboscis, trun- 
cated at the end. Tentacula subulate. 
Suborder 1, Ophisophthalma, Pfr. Pneum. Monogr. p. 3. 
Fam. III. ACICULIDA. 
Character of the suborder—Operculum thin, spiral, with few 
whorls ; foot divided across. 
Aciculide, Gray, Catal. Cycloph. p. 67; Fig. Mollusca, iv. 121, 
1850. 
- Aciculacea, Pfr. Pneum. Mon. p. 3. 
Mr. Gray, who first noticed this family (/%g. Mollusca, iv. 121), 
refers to it two genera, Acicula and Geomelania; the former 
was referred to the genus Carychium, or at least to the same 
family, before the presence of an operculum had been observed. 
The genus 7runcatella, Risso, which is very similar in the struc- 
ture of shell, and even in the amphibious habits of its animal, 
seems to belong rather to the ctenobranchiate mollusea. 
This family is allied to Truncatella and Auricula, Gray, l.c.121. 
I, ACICULA. 
Operculum very thin, glassy, few-whorled. Shell subimperforate, 
rather cylindrical. Peristome rather thickened, with sub- 
parallel margins joined by a thin callus. 
Acicula, Hartmann, 1821, in Steinmiill. Neue Alpina, i. p. 205, 
215; Pfr. 1841, in Arch. f. Naturg. i. p. 225; Chemn. ed. sec. 
1.19, p. 7, 209; Z. f. If 1847, p. 111; Gray, Catal. Cycloph. 
1850, p. 67; Pfr. Pneum. Mon. p. 3. 
Acme, Hartmann, 1821, in Sturm, Fauna, vi.h.5, p.37; Fitzinger, 
1833, Syst. Verz. p. 110; Beck, 1837, Ind. p. 101; Gray, 1840, in 
Turt. Man. 2nd ed. p. 222; 1842, Syn. Brit. Mus. p. 91; Thomp- 
son, 1840, Moll. of Irel. p. 29. 
Acmea, Hartmann, 1821, in Neue Alpina, i. p. 204, 212; Gray, 
1847, 7m Proc. Zool. Soc. p. 180, n. 502. 
Pupula, Agassiz, 1837, in Charpent. Catal. p. 22; Hartm. 1840, 
Erd-u-Stissw. Gast. i. p. 1; Herrmannsen, 1847, Ind. Gen. Ma- 
lacoz. li. p. 364. 
Turbo, Auricula, Carychium, Bulimus, Cyclostoma, Auricella, 
spec., Auct, 
