'54 



St.it Malahia-bay, Nusa-Laut-island. Keet", i Spec. 



,\ c^t sidc .'t raam-island. Reef. i Spec. 

 Stal Ruma-Kuda-bay, Roma-island. Reef. i Spec. 



Amboina X. A. M. . i Sp 



This is the most common species of th<- genus. 



2. Ptcrocera , i Linné. 



Linni . Syst. Nat. Ed. X. p. 742, X" 423. 



ii. Amb. Rariteitkamer, p. 109, Tl. 35, fig. A — ü. 

 Kil oq. Viv. Vol. III, Pterocera, p. 5, PI. 5, PI. iu, fig. 2. 



Rl onch. Ie. Vol. VI, Pterocera, fig. 2. 



ON. Man. of ('onch. Vol. VII, p. 126. 



Stat. 234. Nalahia-bay, Nusa-Laut-island. Reef. 2 Spec. 



Stat. 258. Tual, Kei-islands. 22 M. Lithothamnion, sand and coral. 1 Spec. 



Rostellaria Lamarck. 



1. Rostellaria Powisii Petit. PI. XVI, fig. 2. 



Peut. Magazin de Zoölogie, 1842, PI. 53. 



KIEN ER. Coq. Viv. Vol. III, Rostellaria, p. 6, PI. 2, fig. 2. 



K STER. Martini-Chemn. Conch. Cab. Ed. II, Vol. IV, Strombea, p. 97, PI. 25, fig. 2, 3. 



REEVE. Conch. Ie. Vol. VI, Rostellaria, fig. 4. 



TRYON. Man. of Conch. Vol. VII, p. 128, PI. 11, fig. 22. 



Stat. 306. 8 -7 S., 1 22~ J 54 .5 E. Savu Sea. 247 M. Sandy mud. 7 Spec. 



Stat. 312. Saleh-bay, Xorth coast of Sumbawa. 274 M. Fine, sandy mud. 2 Spec. 



One of the specimens from Stat. 312 is a very line large shell, agreeing with Ri 1 vi 's 

 figure by the prominence of the third liration on the last whorl, which is also broader; the seventh 

 liration is also more conspicuous, though less than the third mie; this specimen contains the 

 soft parts, the other specimen shows the same peculiarities, but is a dead shell and slightly 

 broken. The specimens from Stat. 306 are small and young. 



var. abyssicola n. var. PI. XI. fig. 5. 



Stat. 139. o : 11 S., 127 25 E. Molucca-Passage. 397 M. Mud, stones and coral. 4 Spec. 



Shell small, whitish, thinner than tin- type, the upper whorls nearly smooth, with only 

 one conspicuous groove, bordering a narrow spiral cord, just below the suture; this is continuous 

 untill the aperture, the upper part of last whorl, below that groove, smooth on the ventral side, 

 angular <>n the place wliere in the type runs the third of the lirae, on the back with indistinct 

 spirals. heginning with a row of punctures, more conspicuous behind the apertural margin, base 

 of last whorl with conspicuous spiral cords, separated by punctured grooves; denticles and other 

 particularities of the aperture, as in the type. 



Length of largest specimen 39 MUI. of smallest 33 Mill.. it may have been in both 

 little more. since the canal seems to be slightly broken. 



46 



