HYDROCENA §. 1. 2. 
159 
Cyclostoma Milium Bens, in Ann and Mag. 2d. ser. XI. p. 285. 
Cyclophorus ? Milium Ffr. in Malak. Bl. 1854. p. 84. 
— - — H. et A. Adams Gen. rec. Moll. II. p. 280. 
Hydroccna Milium Bens . in Ann. and Mag. N. H. 2d. ser. XVII. p. 232. 
Habitat cum priore. 
§. 2 . 
13. H. exierta Pfr* 
T. subperforata, ovato-turrita , solida, confertim striata, 
fusculo-cornea ; spira elongato-conica, apice acuta; anfr. 6 
convexiusculi, subcarinati (carina ad suturam subexserta) , ul- 
timus 2 5 longitudinis form an s, peripheria angulatus, basi com- 
pressiusculus ; apertura vix obliqua, acuminato-rotundata ; pe- 
rist. subsimplex, margin e dextro expansiusculo, superne leviter 
repando, columellari calloso, subreflexo. — - Long. 7, diam. 
4 mill. Ap. 3 mill, longa, 2 1 / 3 lata. (Mus Cuming.) 
Hydrocena exserta Pfr. in Proc. Zool. Soc. 1854. p. 306. n. 12. 
— — H. et A. Adams Gen. rec. Moll. II. p. 299. 
Habitat in insula Shanghai. 
14. H. obtuga Pfr. 
T. imperforata, conico-ovata, tenuiuscula, striatula, nitida, 
fulvo-cornea ; spira conica, obtusa; sutura marginata; anfr. 5 
planiusculi , ultimus spira paulo longior, ventrosus ; apertura 
subverticalis, angulato - semiovalis ; perist. simplex, rectum, 
margine columellari calloso, reflexo, appresso. — Long. G 1 /*, 
diam. 4 mill. Ap. 3 1 / 2 mill, longa, 2V 3 lata. (Mus. Cuming.) 
Hydrocena oblusa Pfr. in Proc. Zool. Soc. 1854. p. 306. n. 9. 
— — H. et A. Adams Gen. rec. Moll. II. p. 299. 
Habitat . . . ? 
15. M. oblonga Ffr* 
T. subperforata, oblongo-conica, solida, striatula, opaca, 
fulvo-albida ; spira ovato-conica, apice acuta; sutura marginata; 
anfr. 6 convexiusculi, ultimus J / 3 longitudinis paulo superans, 
convexior, peripheria filocarinatus, juxta perforationem puncti- 
formem subcompressus ; apertura verticalis, angulato-rotundata, 
intus aurantiaca; perist. simplex, rectum, margine columellari 
calloso, subpatente. — Long. diam. 3 mill. Ap. 2 1 / 2 
mill, longa. (Coll. Nr. 336.) 
