238 ri.\\\\; 



HIM \. ( Jray. L847. 



Shell .-HIM ..ill. covered ly an epidermis ; whorls flattened; outer 

 lip thick, sill.mated within. P. BfcAaHLEAJTOB, Lain. 



Subgenus (^i \i H:\HA, ('rosso, 1886. 

 Shell >iim<>th. sjiirallv striated, imperforate ; poristome thickened, 



the margins joined by a .-troiii: parietal callus, columella dilated 

 with a rounded ohtusc tubercle at the base, ba-e of aperture em a r- 

 ginate. ( )j)erculnin thin, corneous, paucispiral, the apex almost 

 terminal. Fluviatile. Q. HlDALGOI, CrOflfle. 



PhMipp 



Perhaj^ more nearly relate<l to Mclanoj)>i>. 



Sul)<renus Quo VIA, Desh, 1830. 



('(.nieally elon^ate<l, apex decollated, whorls solid, flattened, 

 -pirally striated, mouth notched in front, grooved within, columella 

 >mootli. truncate in front, with a posterior spiral plication. 

 1*. IM. OLLATU8, <^uoy. 



; ,w. lin.wn. 1'^Jo'. and Lcn<-<>*ttnini, Swains, 1' S 4<). are syno- 



II V III-. 



SuliLicnus HoLcnsroMA, H. & A., Adams. IN.">:|. 



Shell thin, covered with a bristly epidermis, aperture with a 

 riir produced canal, with an anterior sinus, columella concave, 

 with a posterior callus. P. i'ii.K.i:i;rs, Phil. 



Iti'li'l/i Uct nn. 



LitiopincK. 



GenusLITlOPA. Kan- 1829, 



Shell minute, conoidal, columella truncate at the base, outer lij> 

 simple, thin, notched in front. Operculum spiral. 



Animal i PI. 4<>, fiir. 7!) i with three cirnform filaments on each 

 nde, operculiL'-eroii< lobe with two posterior ap|endi-es, no siphon. 



To ascend tlirou-h the water this little pelagic animal emits an 

 air bubble enclo-cd in a L r lutinous secretion, which draws out a 

 thread a- it rises, and finally attache- it-ell' t<> lloatini: sea weed. 

 Bombyxi.nus, Iie!aiiL r 'T. l- s -'lt. i.- a synonym. L. MI:I. \\<TOMA, 



Rang. 



Subgenus ALABA, A. Ads., 18< % J. 



Shell ovate-CMiiical or rl..n-ated, -iibdiaphanou.-. whorl.- plicate 

 aricose, ajex .-ubmammillate, columella often truncated, oper- 



