221; 



visible ones towards the central part, moreover with numerous very fine curved growth-striae. 

 UmbiHcus moderately large, pervious, scalar, with a rib at its margin and a groove just around 

 this rib. Aperture subtriangular, its margins broken, upper one convex,, basal one nearly straight, 

 columellar margin short, excavated, angular below by the end of the umbilical rib. 



Alt. 2^0, lat. 5; apert. alt. i, lat. r/* Mill. 

 : ^ Resembling the former species by its umbilicus and other general characters, but quite 

 different in many particulars. 



Fam. ToRiNiiDAE. 



Torinia Gray. - 



1. Torinia plajiiilata Hanley. 



• - 'Hanley. Thes. Conch. Vol. Ill, p. 238, fig. jj. 



Tryon. Man. of Conch. Vol. IX, p. 17, PL 5, fig. 77. 



Stat. 47. Bay of Bima. 55 M. Mud with ■ patches of fine coralsand. i Spec. 



Stat. 99. North-Ubian, Sulu-archipelago. 16 — 23 M. Lithothamnion-bottom. i Spec. 



2. Torinia dorsttosa Hinds. 



Hinds. Proc Zool. Soc. Lond. 1.844; P- 23, 



Philippi. Martini-Chemn. Conch. Cab. Ed. II, Vol. II, Solarium, p. 37. 

 .iTryon. Man. of Conch. Vol. IX, p. 17, Pl. 5, fig. 80, 81..- 



Stat. 258. Tual, Kei-islands. 22 M. Lithothamnion, sand and coral, i Spec. 



Stat. 313. East of Dangar Besar, Saleh-bay. Up to 36 M. Sand, coral and mud. 3 spec. 



The specimen from Stat. 258 differs from the type, by a third liration at the periphery 

 and finer sculpture of the base ; as the only specimen is not yet adult and the sculpture is also 

 variable in the typical . specimens, I have provisionally considered it as a variety or individual 

 aberration. From T. cerdaleum Melv. (Ann. and Mag. Nat. Hist. Ser. 7, Vol. XII, 1903, p. 297, 

 PI. 20, fig. 16) which is also tricarinate, it differs by its wide umbihcus, the structure of the 

 columella, etc. 



3. Torinia costata n. sp. PI. XIV, fig. 5- . 



Stat. 279. Rumah-Kuda-bay, Roma-island. 36 M. Mud and sand. 2 Spec. 



Shell discoidally-depressed, deeply umbilicate, thin, yellowish-brown. Nucleus umbilicate, 

 reddish-brown, smooth, consisting of at least 2 whorls. Subsequent whorls 3, upper surface 

 nearly flat, with a cord at the upper and lower suture, bordered by a groove; the intermediate 

 zone is yellowish-brown, sculptured by oblique ribs and fine spiral striae in the interstices of the 

 ribs ; the cords are crenulate and spotted with white, 2 or 3 white crenules alternating with 

 an equal number of brown ones. Whorls separated by a conspicuous canal, in which the Hnear 

 suture is to be seen, canal ribbed in the same manner as the upper surface. Last whorl biangular 



SIBOGA-EXPEDITIE XLIX' i. ^Q 



