62 SCALARTID^. 



angulated in front, umbilical region filled by a twisted funicu- 



liiin. Open-ilium corneous, few-whorled, with subcentral nucleus 



/ope, West Coast of Africa, West I 



Imlian Ocean. Japan. 

 Inn, Maltzan. 1883, is a synonym. 



Tliis -vims has usually Urn arranged with the family Turn- 

 Genus ACLIS, Loven, 1846. 



Animal with long, retractile proboscis, tentacles close together 



iie base, slender, cylindrical, eyes sessile at their external 



bases; foot truncate; mentum narrower than the sole, and 



extending far beyond the head : operculiircrous lobe ample, 



im-ynimetrical. Radula of numerous, simple, aculeiform teeth. 



Shell narrowly umhilicated or rimate, small, turreted, subulate, 



smooth, or usually with spiral rihlets ; aperture oval, entire, the 



>tome not continuous, lip thin, simple. Operculum corneous, 



thin, car-shaped, pmri-piral, witli marginal nucleus. 



Aclis resembles Turritella in form, but is much smaller and 

 nmbilicated. A few living forms are found in European seas, 

 and a dozen fossil species, commencing with the Devonian, are 

 also refei T -d to the genus. 



Ebala (Leach), Gray, is a synonym. 



> (sensu stricto). 



! spirally suh 



p HEMIACLIS, Sars., 1878. 



Shell smooth, spire elongated, a little conical, apex regular, 

 obtuse; base a little dilated, aperture rather large. 



Section GRAPHIS. 



C\ . iMiiiiJtudinally striatrd or reticulated ; spire elon- 



gated, apex obtuse and t\vi>ted; aperture oval, contrai 

 Cion 1S69, is a syn.nym ; the earlier name was 



. changed on account of bein_i j)re)ccujied in 

 lichens. 



Section PHERUSA, Jeffreys, 18 



Shell subcylindrical, smooth, sul>j.erforate ; apex ol.i 

 twisted, but not sinistral ; ai i at the base, lip 



