Pulmonifera of Maine. 13 



Body when fully expanded nearly three times the length of the 

 shell's diameter; very slender; disk white ; head, sides and back 

 bluish ; tentacles dark blue. Superior tentacles unusually long 

 and thick compared to the size of the body. Very active and 

 bold in confinement. 



The indented lines on the surface of the shell ajapear like deep 



seams. The lines of accretion are scarcely distinguishable, though 



close minute revolving lines are apparent. {Plate 2, Fig. 11.) 



Buccal i^late (Fig. 21,) slightly arcuate, partially 



raised in middle of cutting edge, longitudinally 



striate in centre of plate. ^. „, 



rig. 21. 



Lingual membrane 53-39-1-39 ; central plate armed with a long and broad 

 denticle, with a smaller pointed denticle on each side ; laterals three, long and 

 narrow, slightly cm-ved, having one long broad denticle and one smaller outer 

 denticle ; uncini thirty-six, having one long re-curved hook, gradually dimin- 

 ishing to minute plates. [PI. 5, Fig. 22.) 



Hyalina electrina, Gould. 

 Common throughout the State. Appeared to be the most 

 common species in the northern jjarts of Maine. Faint revolving 

 lines mark the surface of the shell ; also slight folds in the perios- 

 traca which run obliquely across the incremental lines. 



Buccal plate, (Fig. 23,J cres- 

 centic, wide through the centre, 

 the lateral terminations turning 

 backward ; the centre of cutting 

 edge produced into a large round- 

 ed beak having on either side one Fig. 23. 

 or two smaller projections. 



Lingual membrane 54-27-1-27. Central plate broad and long, having one long 

 slender denticte and on either side at its base a smaller denticle ; laterals three, 

 bidentate, first two long and narrow, third smaller, uncini having one long claw- 

 shaped denticle. (Fig. 24.) 



Hyalina Binneyana. tsox. sp. {Fig. 25.) 



Body bluish, disk white, viscera bright orange color. Shell thin, 

 pellucid, nearly colorless ; composed of nearly four whorls grad- 

 ually enlarging; spire slightly elevated, aperture well rounded, 

 umbilicus showing all the volutions. Diameter, .13 inch, axis .07 

 inch. 



