203 



(Cylichna occulta (Mighels and Adams). 



Bulla occulta, Mighels and Adams (1841 and 1842) ; and Gould (1870). 

 BuUa Bcinhanli (Holbiill) Moller (1842). 



Cylicktui occulta, H. and A. Adams (1858) ; and Verrill (1879). 

 Cylichna Eeinhardi, Leche (1878). 



Coast of Labrador (Packard). " Norway, Spitzbergen and Greenland, 

 south to Maine " (Pilsbry), though it has not yet Vjeen found inside of the 

 limits embraced within the scope of this paper.) 



Family Tornatinidce. 

 Retusa pertenuis (Mighels). 



Bulla pertenuis, Mighels (1843). 



Utriculus pertenuis, Stimpson (1860); Gould (1870); et auct. 



Diaphana pertenuis, Verrill (1872). 



Retusa pertenuis, Pilsbry (1803). 



Grand Manan, "in 10 fathoms sand, off Cheney's Head " (Stimpson). 

 Fishing banks off Halifax, rare (Willis). Northumbei'land Strait, and Gaspe 

 Bay (Whiteaves). Vicinity of Belles Amour, P.Q., just inside of the Strait 

 of Belle Isle, in 8 fathoms muddy bottom (Packard). 



Fossil in the Leda clay of Montreal (Sir J. W. Dawson). 



Retusa nitidula (Loven). 



Cylichna nitidula, Loven (1S4()) ; et auct. 

 Utriculus nitidulus, G. O. Sar.s (1878). 

 Diaphaim nitidula, Verrill (1880 and 1882). 

 Retusa nitidula, Pilsbrj' (189.S). 



A few living specimens of a shell that Professor Verrill has identified 

 with this species, were dredged by the writer in 1872 and 1873, in the Gulf 

 of St. Lawrence about half-way between the south shore of the Island of 

 Anticosti and the Gaspe peninsula, in 200 fathoms, mud. They had pre- 

 viously and provisionally been referred to the very similar Cylichna umbilicata 

 (Montagu) of which C. strigella, Loven, is a synonym. 



Retusa Gouldii (Couthouy). 



Bulla Gouldii, Couthouy (1839) ; and Gould (1841). 

 Utricidus Gouldii, Stimpson (1860) ; and Gould (1870). 

 Cylichna Gouldii, Verrill (1880). 

 Utriculus (Retusa) Gouldii, Dall (1889). 

 Retusa Gouldii, Pilsbry (1893). 



Annapolis Basin, N.S., seldom (Verkruzen). 



