BITTIUM. 151 



Var. SCABRA, Olivi. 



Dark brown, granulations rounded, regular, theee series on a 

 whorl ( var. rudis, Bragnone). 

 Var. LATREILLEI, Payr. Fig. 80. 



Sculpture finer, light brown, the granulations dark brown, 

 varicose. 



Var. variegata, Monts., is a synonym. 

 Var. PALUDOSA, B. D. D. Fig. 81. 



Whorls convex, longitudinal sculpture more prominent. Brackish 

 water. B. melanosa, Monts., probably belongs here. 

 Var. JADERTANUM, Brusina. Fig. 82. 



Smaller, more lanceolate, whorls a little more convex. 



Var. minor, Phil. = this form. 

 Var. EXIGUA, Monts. Fig. 83. 



Much elongated, whorls subcarinated in the middle, aperture very 

 small. 

 Var. BIFASCIATUM, B. D. D. 



Spiral sculpture scarcely visible, appearing as though only longi- 

 tudinally costate, light yellowish, with two chestnut bands. 



Probably var. Sueziensis, Issel, from the Red Sea, does not differ 

 materially. 

 Var. LACTESCENS, Jeffreys. 



Uniform whitish. = B. albina, Monts. 

 B. AMBLYTERUM, Watson. PI. 30, rigs. 93, 95, 99. 



With close, rounded longitudinal ribs terminating in a spiral 

 row of tubercles at the top and another at the bottom of each whorl, 

 base of body- whorl smooth, translucent white. Length, 6'5 mill. 

 Bay of Biscay to N. W. Africa, 681 to 1261 fins.; Azores, 450 fms.; 



Pernambuco, Brazil, 675 fms. 



Watson thinks it probable that Cerithiella Whiteavesii, Verrill, 

 will turn out to be the same species ; B. gracile, Jeffreys (fig. 95), is 

 a synonym ; B. mamillanum, Watson (fig. 99), described from a 

 single specimen, afterwards broken, from Pernambuco, is apparently 

 another. / 



B. ABRUPTUM, Watson. PI. 30, fig. 97. 



Longitudinal ribs about a dozen, low and narrow, divided by flat 

 broader furrows, crossed by four spiral threads, forming prominent 

 tubercles, base of body whorl smooth ; translucent white. 



Length, 6 mill. 



Fayal, Azores ; 450-500 fms. 



