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by the columellar margin. Aperture rounded, moderately oblique, angular at the upper and 

 peripheral part, margins curved, the columellar one slightly concave, a little reflected, especially 

 at the upper part. Margins connected on the parietal wall, by a thin layer of enamel. 



Alt. 2 3 / 4 , diam. maj. ^/^ apert. alt. 2, lat. 2 Mill. 



The species resembles in shape the preceding one, but is much smaller, with more delicate 

 sculpture. It is allied to Sc. aethcria Melv. & Standen, but is much larger and the slit-fasciole 

 runs at some distance above the suture, which seems not to be the case in Sc. aetheria (Ann. 

 and Mag. of Nat. Hist. Ser. 7, Vol. XII, p. 300, PI. 21, fig. 6). 



Fam. Fissurellidae Risso. 

 Fissurella Bruguière. 

 1. Fissurella (Cremides) sibogae n. sp. PI. VI, fig. 12. 



Stat. 88. o°34'.6N., U9 8'.5E. 1301 M. Fine grey mud. 1 Spec. 



Shell depressed-conical, oval, with slightly convex sides, orifice in front of the middle. 

 Sculpture consisting of numerous, unequal, radiating riblets, about 100 in number, besides a few 

 intermediate ones, and rather numerous concentric lirae, making the riblets slightly nodose, 

 moreover with close-set growth-striae, outer surface whitish. The orifice is not quite intact, 

 rounded-oblong. Inside whitish, muscular impression very indistinct, border of the orifice greyish, 

 without distinct callus. Margin rather acute, indistinctly crenulated, slightly raised at the sides. 



Long. 17, lat. 13, alt. 6; length of front slope 5 1 /», orifice 2V0, post. slope 9 Mill. 



The only specimen is a dead shell, the margins of the base and of the orifice are 

 slightly injured, I have located it with doubt in the subgenus Cremides, as I know no species 

 without hole-callus. May it have been lost? If normal, this species might form a new group. 

 In sculpture it is very peculiar and calls in mind several species of Glyphis, but the interior 

 has no traces of a truncated callus. 



Macroschisma Swainson. 

 1. Macroschisma maxima A. Adams. 



Adams. Proc. Zool. Soc. Lond. 1850, p. 202. 



PlLSBRY. Man. of Conch. Vol. XII, p. 192, PI. 62, fig. 22. 



Cat. Marine Mollusks Japan, p. 106 [M. macroschisma Chemn.). 



Stat. 240. Banda. 9 — 45 M. Lithothamnion-bottom. 2 Spec. 



Stat. ? 1 Spec. 



Stat. 282. Between Nusa Besi and N.E. point of Timor. 27 — 54 M. Lithothamnion-bottom. 1 Spec. 



I owe to Mr. E. A. Smith the identification of this species; the specimens from Banda 

 are red with white rays at the sides ; the specimens are considerably smaller than the figure of 

 Pilsbry, which 'is a copy of the original figure given by Adams (Genera of recent Moll. III, 



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