266 ATYS. 



p. 586, pi. 125, f. 116. SOWB., 0. Ic. f. 10 (not of Ehrenb.). 

 Bulla albicita DOFO, Ann. Sc. Nat. xiv, p. 203. 



This solid, elongated species has several typically quite divergent 

 forms. It is normally moderately convex (figs. 60, 61) ; but some- 

 times much more cylindrical and elongated, and in this form has 

 been called A. elongata (fig. 62). When subangular it has been 

 named A. solida (figs. 63, 64) ; and another form, smaller than the 

 type, has been called A. mccisa (pi. 33, fig. 73) by Adams, but ac- 

 cording to von Martens it is not the species so named by Ehrenberg. 



A. PARALLELA Gould. PI. 28, figs. 21, 22. 



Shell small, thin, pellucid, milk-white, cylindrical, rounded at 

 base, obtusely conical at summit, imperforate at apex ; surface deli- 

 cately marked with lines of growth, and these are crossed at the 

 lower and upper third of the shell by somewhat conspicuous, 

 minutely flexuous, revolving lines. The aperture is narrow, widen- 

 ing downwards ; lip sharp, rising considerably above the apex of 

 the spire, and at the same time inclining towards it, then turning 

 downwards and entering the aperture by a twisted fold, at base it is 

 rounded, and rises upon the columella in the shape of a thick cal- 

 lus, which is not appressed to the body of the shell (Old.). 



Alt. about 12 J, diam. 5 mill. 



Tahiti (Martens) ; Levuka, Fiji (Challenger). 



Bulla paraUela GLD., Pruc. Bost. Soc. N. H. iii, p. 251 (Dec. 

 1847) ; U. S. Expl. Exped. p. 220, f. 267 ; Cyll<-h,,u pumlkln GLD., 

 Otia, p. 246. Atys parallela MARTENS & LANGK., Don urn Uism. p. 

 53. SOWB., in Conch. Icon. f. 21 c (and 21 , b /). WAT80N, 

 Chall. Gastr. p. 640. 



A. DEBILIS Pease. PL 33, figs. 69, 70. 



Shell cylindrically ovate, elongato, narrowed posteriorly, pellucid, 

 fragile, white; outer lip produced and twisted posteriorly: aprx 

 umbilicated, and umbilicus striated or grooved, finely striated trans- 

 versely, transverse raised lines at both ends ; columella with a fold 

 at the base (Pse.). 



Alt. 10i,diam. 5 mill. 



Sandwich Is.; Lend:, Fiji. 



.!>,/> , ///,///.< I'si;.. 1'. / s. I860, p. 20; Amer. Jour. Conch, iii, p. 

 231. CAIMTNTU:, I'. /. 9, L865, j. 511 -MARTENS, I>mum 

 Bism. p. 53, pi. 3, f. 3. Sown., ( '..m-h Icon. f. 28. WATSON, Chal- 

 lenger Gastrop. |>. 



