10 STOMATELLA. 



SON, Challenger Kept., p. 111. Stomatia imbricata SOWB., Genera 

 ii, t. 143, f. 1. S. imbricata Lara. BRAZIER, Proc. Linn. Soc. N. S. 

 W. ii, p. 46. 



One of the largest species. The very depressed form, nearly 

 horizontal aperture and closely, evenly spiralled surface distinguish 

 it. 



(Group of S. sulcifera Lam.) 



S. PAPYRACEA Chemnitz. PI. 52, figs. 46, 47 ; pi. 51, fig. 9. 



Shell globose, thin, obliquely conoidal, fawn colored, with a series 

 of short markings at the periphery alternately reddish and. white, 

 and narrow girdles on the spirals of fine arrow-shaped articulations. 

 Surface shining, polished, spirally sculptured by numerous low wide 

 riblets ; striae of increment fine. The spire is conical, small, acute; 

 whorls 5 to 6, the last very rapidly enlarging, those of the spire with 

 narrow sharp spiral lirse decussated by close raised longitudinal 

 striae. Aperture oval, acutely angular above, not very oblique, 

 brilliantly iridescent inside, and lightly sulcate ; columella deeply 

 arcuate, umbilical region covered by an opaque, white, arcuately 

 striated callus, its outer edge well defined. 



Alt. 25, diam. 28 mill. ; aperture, breadth 18, oblique alt. 20 

 mill. 



Sooloo Archipelago (A. Ad.); Moluccas (Gould). 



Cochlea lunaris papyracea fragilissima, etc., CHEMNITZ, ConchyL 

 Cab. v, p. 215, t. 182, f. 1817, 1818 (178l~).Stomatella papyracea 

 Chemn., A. AD. in Thes. Conch, ii, p. 836, 1. 174, f. 4, 5. SOWERBY 

 in Reeve's Conch. Icon, xix, f. 3. Stomatella tumida GOULD, Proc. 

 Bost. Soc. N. H. iii, p. 74, 1849 ; U. S. Expl. Exped. Moll., p. 209, 

 f. 249. 



The animal, according to Adams, has a horny operculum and 

 although bulky is able to retract entirely within the shell. 



The shell is smoother, more polished than any other large species ; 

 the umbilical callus is also notable. 



The S. tumida of Gould is figured on pi. 51, fig. 9. 



S. BACONI A. Adams. PI. 52, figs. 38, 39. 



Shell oval-orbicular, subturbinate ; spire produced, apex acute ; 

 whorls concave above ; dull white, variegated with reddish-brown, 

 transversely spirally sulcate, the interstices longitudinally striated ; 

 aperture sulcate within ; inner lip a little thickened, white, reflexed^ 



