226 CATALOGUE OF PHANEROPNEUMONA. 
9. CycLOSTOMA LUNULATUM. 
Shell cylindrical, solid, striated or reticulated elegantly, pellucid, 
white, marked with 4-5 bands composed of moon-shaped red- 
dish-brown stripes; whorls 5; suture crenulate ; aperture cir- 
cular, produced beyond the preceding whorl; umbilicus like 
that of Nerita Licinia. Length 7, breadth 42’”. (Jfiller.) 
Nerita lunulata, Mill. Hist. Verm. ii. p. 180, n. 366. 
Turbo lunulatus, Gmel. Syst. p. 3605, n. 72. 
Locality unknown. 
This species has been referred by Mérch to Cyclostoma Au- - 
beriana Orb., but its characters appear to be more congruent with 
those of Cycl. decussata Lam. 
Fam. IT. HELICINIDA. 
Operculum annular, not spiral, shelly, thick, or horny and thin, 
semiovate or rather triangular; nucleus subcentral, lateral. 
Remaining characters those of the suborder. 
Helicine, Ferussac, 1821, Tabl. p. xxxiii.; Rang. 1829, Manuel, 
p. 128; Potiez et Michaud, 1838, Gal. Douai, i. p. 228. 
Helicinide, Latreille, 1825, Fam. Nat.; Ed. Berth. p.177; Gray, 
1842, Syn. Brit. Mus. p. 91. : 
Helicinade, Guild. 1828, Zool. Journ. iii. p. 528. 
Helicinaceze, Menke, 1828, Synops. p. 22. 
Helicinacea, Menke, 1830, Synops. ed. ii. p. 39; Pfr. 1841, Symb. 
Hist. Helic. i. p.4 (excluding Pupina); 1847, Z. f. M. p. 151; 
Pfr. in Chemn. Conch, ed. sec. i. 18, p. 1; Pneum. Mon. p. 3ic. 
Oligyrade, Gray, 1847, Proc. Z. S.xv.p.182. In I. #. Gray, 
fig. Mollusca, iv. 121. 
Lamarck proposed the genus Helicina, in 1799 (Prod. 76), with- 
out referring to a type; but in his System, both the character 
and the figure to which he refers evidently belong to a genus 
which he afterwards called Fobel/a, a marine species of Trochide. 
In L’ Histoire, he confined the genus to the terrestrial mollusca 
here described. He described four species. 
In 1817, Say (Journ. Acad. Phil. 283), and in the article Con- 
chology in the American edition of Nicholson’s Encyclopedia 
(1819), described a species not known to Lamarck, as a new 
genus, under the name of Oligyra; he first described the animal 
and pointed out its affinity to and the differences from Cyclostoma. 
This may be considered as the first proper description of the genus. 
