Fam. Planaxidae. 

 Planaxis Lamarck. 



1. Planaxis sulcahis Born. 



Born. Mus. Vindobon. p. 250, PL 10, fig. 5, 6. 



Reeve. Conch. Ic. Vol. XX, Planaxis, fig. 4. 



Tryon. Man. of Conch. Vol. IX, p. 276, PI. 52, fig. 22, 23. 



Stat. 19. Bay of Labuan Tring, West coast of Lombok. iS — 27 M. River-mud, coral, coral- 

 sand. 18 Spec. 

 Stat. 47. Bay of Bima, near South fort. Shore. 3 Spec. 

 "Java (N. A. M.). 27 Spec. 



A very variable species ; I cannot detect however specimens agreeing sufficiently with 

 the species or varieties dreviailus Desh. or Savignyi Desh. 



2. Planaxis nigra Quoy & Gaimard. 



Quov & Gaimard. Voy. Astrol. Zool. II, p. 491, PL 33, fig. 22 — 24. 



Reeve. Conch. Ic. Vol. XX, Planaxis, fig. 13. 



Tryon. Man. of Conch. Vol. IX, p. 278, PL 52, fig. 37. 



Stat. 165 North-east side of Daram-island, East coast of Misool. Reef. 24 Spec. 



The specimens are young; from the West Indian P. micleiis Wood they differ by their 

 convex whorls, from P. abbreviata Pease, in being larger. Tryon (1. c.) has for that species 

 given a length of 7^5, Mill., whereas the juvenile specimens under consideration, reach a length 

 of 10 Mill. The specimens have a white nucleus, one groove below the suture and a few ones 

 near the base. 



Quoyia Deshayes. 

 I. Quoyia decollata Ouoy & Gaimard. PI. XVI, fig. 4. 



QuOY & Gaimard. Voy. Astrol. Zool. II, p. 489, PL 33, fig. 33, 34. 



Reeve. Conch. Ic. Vol. XX, Planaxis, fig. 37. 



Tryon. Man. of Conch. Vol. IX, p. 280, PL 53, fig. 71. 



Stat. 131. Beo, Karakelang-islands. Reef 32 Spec. 



Operculum paucispiral, with a subterminal nucleus on the left or columellar side. 



The radula is rather long, about 7^3 Mill, in length; its rhachidian tooth (R) has a 

 broad body, with elongated wings on each side and an appendix at the basal margin, cusp 

 broad, rounded, two denticles on the body or basal part; lateral tooth (i) with apparently sub- 

 triangular body, with a long tail at the distal side, a large reflected cusp and 3 smaller denticles 

 on its distal side, probably also a few on the proximal side, which are however covered by 

 the central cusp ; uncini (U), with an elongate body, the inner one has a cusp with 6 denticles, 

 moreover if placed in a favorable position, I see a very thin part along the body, ending in a 



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