Pulmonifera of Maine. 19 



scarcity of individuals appears more marked, when specimens of 

 other species are frequently met with in abundance. This species 

 occurs in nearly all positions even in growths composed almost 

 exclusively of pine, spruce and hemlock. 



The animal is white, the head and tentacles faintly marked with 

 dark spots. 



The surfiice of the shell is raised in numerous costal folds, 

 frequently anastomosing; longitudinal ribs reticulate the surface 

 and render the folds so crenulated that in certain lights the shell 

 appears as if ornamented with strings of beads. This peculiar 

 character disappears at the base of shell, and is replaced by 

 revolving lines and regular lines of accretion. {Plate 2, Fig. 7.) 



Buccal plate, (Fig. 42,) a long narrow slightly curved ^;^- ^ 



lamina, middle of cutting edge indented as in S. ferrea. - — -^^ 



Lingual membrane 68-17-1-17, central plate twice as Firj. 42. 



broad as long, equal in size to two laterals, tridentate, central denticle very- 

 thick, nearly twice as long as plate, side denticles stout ; laterals two, similar in 

 shape, bidentate, denticles small, uncini long claw shaped, first five uncini having 

 a small denticle on the outer side of long one. (PL 7, Fig. 43. j 



Conulus chersina, Say. 



Occurring from the northern to the southern confines of the 

 State. At Fort Kent on the extreme northern boundary I found 

 very large specimens of this species. 



The inferior tentacles are quite long and slender. A few 

 indistinct lines of growth are visible on the shell, and also 

 numerous revolving lines which are more distinct at the base of 

 shell ; near the suture the periostraca is marked with very short 

 minute wrinkles which are scarcely visible even when magnified 

 four hundred diameters, {Plate 2, Fig. 4. 



Buccal plate, (Fig. 44,) a broad wide crescentic 

 lamina, with the cutting edge raised in the centre, 

 forming a rounded beak. 



Lingual membrane 80-18-1-18, central plate nearly Fig. 44. 



square, tridentate, central denticle long, slender ; side denticles very small, 

 laterals seven, merging into uncini, bidentate similar in form to central ; uncini 

 bicuspid. (PI. 7, Fig. 45.; 



