1896.] NATURAL SCIENCES OF PHILADELPHIA. 437 



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. 



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. 



Bulimulus (Nsesiotus) jacobi var. oinereus Reibiscb. Plate XVI, fig. 14. 



Btdimulus {Ncrsiotus) cinereiis Keibisch, Isis, 1892, p. 7, t- i, fig. 10. 

 Bulimulus jacobi var. vermiculatus Dall, Nautilus, VII, p. 53, Sept., 1893. 



James Island at James Bay, Dr. Baur and Wolf. No living 

 specimens of this species appear to have been collected. 



This variety is hardly separable from the smaller B. jacobi, 

 though the dead and the fresh shells appear quite dissimilar. It is 

 somewhat smaller than the smallest undoubted jacobi, and the 

 granular sculpture is more dense and uniform. I have not seen 

 any specimens with a spire as long and pointed as in Reibisch's fig- 

 ure. A specimen sent by him agrees in every way with those col* 

 lected by Dr. Baur. 



Bulimulus (Nsesiotus) olla Dall. Plate XVI, fig. 2. 



Bidimus jacobi Keeve, Conch. Icon. Bulimus, pi. XXI, fig. 135, 1848. 

 Bulimulus olla Dall, Nautilus, VII, p. 53, September, 1893. ' 



James Island, Cuming, Lea Collection ; Duncan Island, all dead, 

 but fresh, Dr. Baur ; Barrington Island, dead. Dr. Baur ; Conway 

 Bay, Indefatigable Island, Dr. Baur. 



This shell is closely related to B. jacobi, and was figured by 

 Reeve under that name. B. olla is larger, and wants the granula- 

 tions oi B. jacobi, its surface is nearly smooth and almost polished, 

 marked with faint incremental lines, has seven whorls (against six 

 in the other species) and a very bulbous pillar. The present species 

 inhabits the grassy upper zone, while B. jacobi is found in the wooded 

 area. 



