CYCLOPHORID&. a 
The same order has been designated with the name of Cyclo- 
stomacea by Reeve (1842, Conch. Syst. ii. p. 90), and by A. Catlow 
(1845, Conch. Vom. p. 168). Its genera are Pupina, Cyclostoma, 
Helicina, and Truncatella. 
Sismonda (1842, Syn. an. inv. p. 27) unites the genera Cyclo- 
stoma and Helicina in the same section of Gasteropoda, named 
Cyclostomata. 
Jay (1850, Catal. p. 251) admits Reeve’s family of Cyclostomacea 
with the genera Pupina, Truncatella, Cyclostoma, Geomelanea, 
Helicina, and Stoastoma. 
Gray, in the text to Mrs. Gray’s Figures of Mollusca, iv. 
p- 120, divides the suborder into three families, viz., 1, Cyclo- 
phoride ; 2, Olygyrade ; 3, Aciculade. 
The suborder Phaneropneumona may be divided, with respect 
to the external structure of the animals, namely, by the position 
of the eyes at the base of the tentacles, into two sections, 
1, Ectophthalma; and 2, Ophisophthalma. 
Sect. . ECTOPHTHALMA. 
Hyes on the side of the head, at the outer base of the tentacula. 
Foot rather elongate. Operculum horny or shelly, distinctly 
spiral or annulated, not spiral. 
By this last character the two families may be distinguished, He- 
licinidze and Cyclophoride. (Pfr. Pneum. Monogr. p. 14.) 
Fam. I. CYCLOPHORID. 
Operculum distinctly spiral, shelly, cartilaginous or horny, with 
very numerous, nearly equal, or with a few rapidly-enlarging 
whorls. 
Turbicina, Ferussac, 1821, Tabl. Syst. p. xxxiii.; Latreille, 1825, 
Fam. Nat.; Rang, 1829, Manuel, p.179; Potier et Mich. 1838, 
Galérie de Douai, i. p. 232; Herrmannsen, 1847, Ind. Gen. 
Malac. ii. p. 636. 
Cyclostomade, Risso, 1826, Hist. iv. p. 103. 
Cyclostomiate, Menke, 1828, Synops. p. 22. 
Cyclostomacea, Menke, 1830, Synops. ed. alt. p. 32; Pfr. 1841, 
Symb. Helic. i. p. 43; Chemn. ed. alt.i.19, p.7; Z. f. I p. 101; 
1851, Jbid. p. 129 ; Consp. p. 1; Pneum. Mon. p. 14. 
Cyclostomoidea, Fitzinger, 1833, Syst. Verzeichn. p. 115. 
Cyclostomide, Gray, 1840, in Turt. Man. ed. sec. p. 102, 273; 
Syn. Brit. Mus. 1842, p.91; Troschel, 1847, Z. f. M. p. 42. 
Cyclostomina, Milne Edwards, 1841, Elem. Zool. 
