46 GIBBERULA. 



M. SEMEN, Reeve. PI. 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 ver}^ near to M. ovuli- 

 formis, Orb. 

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



Vitreous white, with revolving striae ; lip minutely denticulate 



witHin ; columella two-plaited. Length, T3 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. 



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



Habitat unknown. 

 May 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- 

 lated within. Length, 6 mill. 



Borneo. 

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



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



False Bay, Cape of Good Hope; from Gorgoniae 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 sufficientl}* 

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

 it a new family Cystiscidse, 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. 



