8q 



3. Stoma tia rtLbi'a Lamarck. • 



Lamarck. An. s. vert. Ed. Desh. Vol. IX, p. 16 [Stoniatella). 



Reeve. Conch. Ic. Vol. XIX, Stomatia, fig. 8. 



PiLSBRY. Man. of Conch. Vol. XII, p. 33, PI. 51, figs. 26—28; PL 53, fig. 96; PI. 54, figs. 31—33. 



Stat. 98. 6°9'N., I20°2i E. 350 M. Sand, i Spec. 



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



The specimen from Stat. 98 is a young, dead shell of somewhat doubtful identification, 

 its spire being more elevated than in any specimen I have seen ; the great depth at which it 

 has been collected, may be caused by the sinking down of the dead specimen. The other 

 typical specimen from Stat. 99 contains the soft parts. The upper surface of the foot is tuber- 

 culate- and spotted with black, and the tentacles are ringed by the same colour, on a yellowish- 

 grey ground. 



4. Stomatia planulata n. sp. PI. VI, fig. 8. 



Stat. 93. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu-Archipelago. Reef, i Spec. 

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



Shell much depressed, the spire only a trifle above the last whorl; colour variable; in 

 both specimens a greenish-grey colour predominates, in the largest one, the top whorls are 

 variegated with crimson and a large patch of the same colour occupies the upper part of the 

 last whorl, near the aperture; the upper part is covered by microscopic spiral rows of darker 

 arrowhead-shaped spots, the basal part is more yellowish. Number of whorls about 3^/,, the 

 last rapidly increasing; they are very convex, with a deep suture, and short subsutural folds. 

 The sculpture consists of a keel at some distance from the suture, enclosing a concave zone, and 

 another keel near the periphery; between these keels I'uns a row of elongated, slightly oblique 

 tubercles, moreover the whole shell is covered with fine spiral striae and still finer growth-striae. 

 Aperture very oblique, its upper margin concave near the body whorl, then strongly convex. 



Alt. 3, diam. maj. 9^/„, diam. min. 7Y2; apert. alt. 3^/,, oblique about 5Yj Mill. 



The specimen from Stat. 99 is much younger, partly covered bj- a chalky deposit, it 

 has an interrupted, spiral, crimson band at the periphery. 



I know no species with which to compare the new one, the excavation of the upper 

 part of both specimens, give it a very exceptional character, resembling a large Planorbis. 

 Animal large, upper surface of foot granular and tuberculate, with three epipodial cirri, of which 

 the third is placed on the detachable part of the foot. 



Gena Gray. 

 I. Gena planulata Lamarck. 



Lamarck. An. s. Vert. Ed. Desh. Vol. IX, p. 17 {Stmnatella). 

 ,RUMPH. Amb. Rariteitkamer, p. 121, PI. 40, fig. I. 

 Reeve. Conch. Ic. Vol. XIX, Gena, fig. 3: 



PiLSBRY. Man. of Conch. Vol. XII, p. 38, PI. 55, figs, i, 23; PL 2, figs. 17 — 20. 



So 



