46 GIBBERULA. 



M. SEMEN, Reeve. PL 12, fig. 71. 



Spire minute, almost immersed; shell dull white; columella 

 callous, minutely four-plaited. Length, 4 mill. 



Habitat unknown. 



Jousseaume changed the name to M. cinerea, because Lea 

 had previously used semen for a fossil species ; the latter, how- 

 ever, is said to be the young of M. larvata, Conrad. Mr. 

 Redfield remarks that this species is very near to M. ouuli- 

 formis, Orb. 

 M. PULVIS, Jousseaume. PI. 12, fig. 72. 



Yitreous white, with revolving striae ; lip minutely denticulate 



within; columella two-plaited. Length, 1-3 mill. 



Isle of Bourbon. 

 Evidently, as suggested by Dr. Weinkauff, an embryonal shell: 



M. MARIET, Crosse. PI. 12, fig. 73. 



Minute, globosely inflated, spire immersed, columella four- 

 plicate. Length, 1 mill. 



New Caledonia. 



Is this a juvenile of M. Angasi, Brazier? 



M. ROS, Reeve. PI. 12, fig. 74. 



^ white, columella minutely plaited. Length, 4 mill. 



Habitat unknown. 

 be the equivalent of several other species of this section. 



M. BULBOSA, Reeve. PI. 12, fig. 75. 



Opaque white ; columella four-plaited; lip minutely denticu- 1 

 lated within. Length, 6 mill. 



Borneo. 

 M. CYSTISCUS, Redfield. PL 12, fig. 70 ; PL 2, fig. 11. 



Shell white, columella four-plaited. Length, '14 inch. 



False Bay, Cape of Good Hope; from Gorgonise in 20 fathoms. 



The dentition and shell are like Marginella; but the animal, 

 which has short, flattened, triangular, horizontal tentacles, with 

 minute dark reddish eyes, behind their bases, differed sufficiently 

 to induce Stimpson, who discovered the species, to establish for 

 it a new family Cystiscidre, and to call it Cystiscus Capensis. 

 Mr. Redfield, very properly, I think, remanded the species to 

 Marginella, and the specific name being preoccupied in that 

 genus, called it M. cystiscus. The foot of the animal is lemon- 

 yellow. 



