226 



monograph seems to be in most instances a bad copy and translation of that of Reeve, has 

 overlooked that mistake. 



10. Scala abyssicola n. sp. PI. XV, fig. 2. 



Stat. 45. 7° 24 S., 1 18° 15'. 2 E. Flores Sea. 794 M. Fine grey mud. 2 Spec. 



Shell subperforate, pj'ramidal, thin, whitish; nucleus wanting, remaining whorls 8, very 

 convex, obtusely angular at the shoulder, slightly disunited, nearly smooth, but with a few 

 remote spiral striae and fine growth-striae; the whorls are crossed by thin, slightly reflected 

 ribs, 18 in number on the last whorl; these ribs are spinous at the shoulder, their margin is 

 serrulate (these serrulations may be natural or caused by friction) they are practically equal, 

 none of them being varix-like; base of shell regularly rounded. Aperture circular, right margin 

 thin (young?) its columellar margin broadly reflected over the perforation and quite covering, 

 but probably not closing it. 



Alt. 1473, lat. 5 Mill.; aperture of a specimen long 97, Mill, 2Y3 Mill. 



This species resembles in shape the preceding one, but it is quite different by its nearly 

 smooth interstices of the ribs, which are themselves more simple, being undulate in S. fragilissima. 



11. Scala (ClathriisJ Melvilli n. sp. PI. XIV, fig. 9. 



Stat. 114. Kwandang-bay-eiitrance. 75 M. Hard sand, very fine, i Spec. 



Shell pyramidal, imperforate, very thin, transparent, white. Whorls 9, of which 3 smooth 

 nuclear ones. Postnuclear whorls very convejj, slightly shouldered, with a very deep suture ; 

 upper and basal part of each whorl smooth, median part with 3 thin spiral ribs in the inter- 

 stices of the radiating ribs, which are thin, lamellose, flexuous, with an auricle at the suture 

 and another at the shoulder, moreover an undulation at the peripheral part, and a second one 

 near the base of each whorl ; in the upper whorls the ribs are more simple. Aperture circular, 

 with a broadly expanded margin, formed by the last rib, of which there are 15 on the last 

 whorl ; columellar margin narrowly reflected, accompanied at the place of the umbilicus by a 

 lamellose rim. 



Alt. s'/j, lat. 2^8; apert. 1^4 Mill, in diameter. 



This species resembles S. vialcolmensis Melvill (Memoirs and Proc. Manch. Lit. and Phil. 

 Soc. Vol. 42, 1898, p. 20, PI. 7, fig. 2), but the ribs of the new species are much more elaborate, 

 beinof flexuous. 



'& 



12. Scala (Opalia) lamellosa Lamarck. 



Lamarck. An. s. vert. Ed. II, Vol. XIX, p. 73. 

 KlENER. Coq. Viv. Vol. IX, Scalaria, p. 10, PL 3, fig. 7. 

 Tryon. Man. of Conch. Vol. IX, p. 74, PI. 15, fig. 83, 84, j-j. 



Stat. 116. West of Kwandang-bay-entrance. 72 M. Fine sand with mud. i' Spec. 



Stat. 152. Wunoh-bay, N. W. coast of Waigeu-island. 32 M. Lithothamnion-bottom. i Spec. 



Perhaps the name perplexa Pse. would be the most fitting one for this shell, as really 



118 



