HYDROCENA §.2. 3. 4. \Q] 



19. H. exi@;Ha Jlucqviinot. f 



T. subperforata , ovato-conica, striata (?), cnrneo-albida ; 

 spira inflato-conica , acuta; anfr, 4 convexi, ultimus spiram 

 subaequans ; apertura acuminato-ovalis , intus rubella ; perist. 

 rectuni , subcontinuum , margine columellari clilatato. — Long. 

 2'/2j diam. 1 mill. (Ex icone.) 



Cycloslomn [fxigua Ilombr. et Jacq. Voy. Pol Sud. Zool. V. p. 47- 

 t. 12. f. 1—3. 



Habitat in insula Mangareva. 



§. 3. 



20. H. liieK Bensoii. f 



„T. vix perforata , ovato-acuta , minutissime striata , spi- 

 raliter confertiin tenuisulcata, succinea, translucente , versus 

 spiram rubello-fusca ; spira nitida, elongato-conica, sutura pro- 

 funda, apice obtusiusculo ; anfract. 4 valde convexis, ultimo ^/j 

 totius testae superante; apertura obliqua, ovata , superne an- 

 gulata, peristomate tenui, non continuo, marginibus conniven- 

 tibus, dextro recto, acuto, columellari reflexiusculo. — Operc. 

 tenui, corneo, pellucido, paucispirato, nucleo basali. — Long. 

 22/3, diam. 12/3 uiill." (B.) 



Hydrocenn Illex Bens. in Ann. and Mag. N. H. 2d. ser. XVH. p. 231. 



Habitat ad Phie Than valHs Tenasserira in imperio Birraano 

 (W. Theobald). 



21. sarrita Benfi. -j- {Bens. in Ann. and Mag. 2d. 

 ser. XVH. p. 231. — Ci/clost. snrrilum Uens, Pfr. 

 l'neum., Cray Phan. p. 224.) Mon. p. 314. 



22. II. P^xis Benson. f 



„T. obtecte perforata, ovato- conica, spiraliter sulcata, 

 succinea , translucente, versus spiram rubente; spira conica, 

 sutura profunda, aplce obtuso; anfract. 4 convexis, uhimo 2^ 

 totius testae aequante; apertura obliqua , semicirculari , peri- 

 stomate tenui , acuto , non continuo , niargine cohimellari ex- 

 panso, reflexiusculo. — Long. l*/,, diam. I1/4 mih." (B.) 



Ilydrocena Pyxis liens. in Ann. and Mag. N. H. 2d. ser. XVH. p. 232. 

 Habitat ad Thyet-Mio imperii Birraani (W. Tlieobald). 



.§. 4. 



23. iiieroslypliiea Fer. fColl. 338. — Omphalotro- 

 pis Pfr. in Proc. 1854. p. 307. — .r^rf. Gen. p. 300. 



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