COLIMACEA. MOLL use A. HELIX. 169 



In solidity, color, polish and general shape, this is allied to B. 

 Gouldii; but is much smaller, and is at once distinguished by its ex- 

 hibiting no spire. 



Bulla lineolata. 



Shell minute, ovate, ferruginous ; xchorls three, the last envelop- 

 ing all the others, and marked with numerous revolving lines ; 

 aperture dilated anteriorly. 



Figure 99. i 



State Coll., No. 115. Soc. Cab., No. 2386. 



Bulla lineoliita, Couthouy ; Bost. Journ. JVat. Hist., ii. 179, pi. 3, f. 15. 



Shell very small, oblong-ovate, broadest anteriorly, very thin 

 and fragile, covered with a thin, rust-colored epidermis ; whorls 

 three, forming a flattened spire, the outer one somewhat in- 

 flated, and delicately marked with numerous, impressed, re- 

 volving lines ; aperture extending the whole length of the shell, 

 very narrow behind, and rapidly widening forwards, so that the 

 lip is broadly rounded in front ; the pillar has a faint oblique fold 

 near the middle. Within glossy, yellowish-white. Length ^V 

 inch, breadth ^% inch. 



Several specimens of this very delicate and very singular shell 

 have been taken from the stomachs of fishes caught in the Bay. 



It appears like a diminutive specimen of Bulla lignaria, but its 

 somewhat elevated spire is one good distinctive mark. The revolving 

 lines are rather distant, regularly disposed, and always conspicuous 

 under a magnifier. 



Family COLIMACEA, Lam. 



Animal terrestrial, breathing air, tentacida cylindrical, bearing eyes. Shell 

 spiral, destitute of any external prominences except ridges of increase, the outer 

 lip often refected. 



Genus HELIX, Lm. 



Shell orbicular or sub-globular, spire not much elevated ; aper- 

 ture oblique, broader than long; the pillar and outer lip continu- 

 ous, simple or armed with teeth. 



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