46 GIBBERULA. 



M. SEMEN, Reeve. PL 12, fig. 11. 



Spire minute, almost immersed; shell dull white; columella 



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



Habitat imknoion. - 



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 31. lar^vata^ Conrad. Mr. 

 Redfield remarks that this species is ver}^ near to 31. ovuli- 

 formiH^ 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. WeinkauflT, an embr3-onal shell. 

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



Minute, globoseh^ inflated, spire immersed, columella four- 

 plicate. Length, 1 mill. 



Neic Caledonia. 



Is this a juA'enile of 31. Avgasi, 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 minuteh' denticu- 

 lated within. Length, 6 mill. 



Borneo, 

 M. cYSTiscus, Redfield. PI. 12, fig. 70 ; PI. 2, fig. IL 



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



False Bay, Cape of Oood Hope; from Gorgoiiise in 20 fathoms. 



The dentition and shell are like 3IargineUa ; 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 Cystiscvs Copensis. 

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

 3Inrg''meUa.i and the specific name being preoccupied in that 

 genus, called it 31. cyatinicvii. The foot of the animal is lemon- 

 yellow. 



