112 BULIMULUS-NAESIOTUS. 



jacobi STEARNS, Proc. U. S. Nat. Mus., XVI, p. 381, lS93Bulimu- 

 lus (Nassiotus) pallidus REIBISCH, Isis, 1892, p. 18, t. i, fig. 9. Buli- 

 mulus (Ncesiotus) acutus REIB., op. cit., p. 20, t. i, fig. 13, 1892. ? Bull- 

 minus avellana BECK, Index, p. 70. 



"The typical B. jacobi, sent by Cuming to Dr. Lea in 1838, is a 

 small, stout shell, with rather inflated whorls, covered with fine 

 granulations, minute, obliquely transverse broken wrinkles, and fine 

 granular spirals, hardly visible without magnification. The shell is 

 pale reddish-brown, sometimes with a narrow, pale peripheral band. 

 The pillar and body are without fold or tubercular callus. Those 

 collected by Dr. Baur on Charles Island are the smallest I have 

 seen which can be positively referred to this species. The larger, 

 smooth form figured by Reeve under this name is distinct, and will 

 be found referred to under the name of B. olla" (Dall). 



Var. pallidus Reibisch. PI. 23, fig. 20. 



Differs from the typical form in being slightly smaller and more 

 slender without the wrinkles, and it is probable that a large series 

 would show no dividing line between the variety and the type. 



Var. acutus Reibisch. PL 23, fig. 21. 



Differs from pallidus in the almost entire absence of the spiral 

 granulated sculpture, leaving much of the surface polished and 

 smooth, except for incremental lines. Reibisch's figure shows one 

 whorl more in the same length than the specimen he was kind 

 enough to send me for examination, but slight differences of this 

 kind are common among these very variable forms. It also comes 

 very close to some varieties of B. nucula and B. amastroides, the 

 latter being slightly smaller and more spindle-shaped (Dalfy. 



Var. cinereus Reibisch. PI. 23, fig. 17. 



Shell with five and a half sharply granulated, wrinkled whorls ; 

 suture deep, aperture small, simple, thin-edged ; umbilicus perforate, 

 rather large but not funicular. Alt. 8, diam. 5'5, alt. of last whorl 

 6-0 mill. (Dall). 



James Island at James Bay (Dr. Baur and Wolf). 



Bulimulus (Ncesiotus) cinereus REIBISCH, Isis, 1892, p. 19, t. i, fig. 

 10. Bulimulus jacobi var. vermiculatus DALL, Nautilus, VII, p. 53,. 

 Sept., 1893. Bulimulus jacobi var. cinereus Reib., DALL, Proc. A. 

 N. S. Phila., 1896, p. 437, pi. 16, f. 14. 



