588 PROCEEDINGS OF THE ACADEMY OF 



Shell thin and translucent, form paraboloid, the apicial whorls having a 

 greater angle than those forming the body of the shell. 



Dimensions variable. In the Mohawk River, adults are often 3-16th inch in 

 length. In other localities it is usual to find them much less. 



Soft parts seen through the shell orange or white, with one or more irregu- 

 lar bands like the preceding species. 



External soft parts Inferior surface. Foot as long or a little longer than 

 the shell, anterior truncated and rounded. The anterior lateral angles formed 

 by the constriction of the lateral portions of the foot as in other species. The 

 middle of the lateral portions of the foot expanded, growing narrower poste- 

 riorly and terminating in a rounded extremity. Anterior portion white, with 

 a translucent border ; posteriorly granulated with numerous, crowded, minute 

 white points. Tentacles diverging in front of the anterior margin of the foot. 

 Rostrum extending about half as far as the tentacles beyond the foot. Supe- 

 rior surface. External soft parts nearly all white and translucent : eyes black 

 and set close to the base of the tentacles ; between the tentacles is a longitudinal 

 strip of dark brown, which fades to orange on the base of the rostrum. 

 Scarcely any granulations, or other markings appear on any of the superior 

 surfaces. 



Melania subularis, Lea. Soft parts. 



Inferior surface of foot salmon colored, with a narrow, well-defined border 

 of lighter tint around the semicircular anterior margin, within which is a 

 wider band of a deep flesh color. 



The superior surface of the foot orange-colored; the anterior portion present- 

 ing a deeper tinge, with numerous well-defined black lines parallel with the an- 

 terior margin, but separated therefrom by a zone of the same tint, as the 

 narrow margin of the inferior surface. 



The superior lateral portions of the foot are marked with irregular anasto- 

 mosing black lines, which preserve a general parallelism with the margins of the 

 foot, but frequently terminating downwards in the lateral margins of the foot ; 

 toward the neck the anastomosing lines embrace numerous areas of granular 

 surface, in which the granulations are not strongly marked. The rostrum in- 

 clines to a yellowish tinge, and is marked by numerous fine black transverse 

 lines, which are least developed on the superior lateral portion of the rostrum 

 near the middle of its length. 



The anterior and a narrow lateral portion have a lighter appearance. The 

 tentacles present a faint greenish tint, and are marked near their tips with 

 dark bands, presenting a jointed appearance. The tentacles are small and 

 somewhat elongated. The eye appears as a small but well-defined black spot 

 at the apex of a rounded but not very elevated tubercle, growing out of the 

 head and posterior of the base of the tentacle, a little above a line connecting 

 the axes of the tentacles at their insertion. 



The lateral portion of the foot presents a vertical sinus or fold extending up 

 along the neck from the constricted portion of the foot behind the angular ter- 

 mination of the rounded anterior. The existence of this sinus permits the foot 

 to be largely extended. The color of the external soft parts is not uniform in 

 a series of specimens, though the form and the black lines are constant. In 

 some specimens there are scarcely any traces of orange or flesh tints. In these 

 the soft parts are more translucent, and the inferior portion of the foot is 

 white, with a blue tint, resulting from translucency. The parts within the 

 shell are sometimes yellow or orange, and those of the apicial whorls sometimes 

 green. The motions of the animal in progressing are irregular. 



The foot is elongated, the shell remaining stationary ; the posterior portion 

 of the foot is then contracted, and the shell pulled forward. At this point 

 the foot presents an outline. 



These movements are sometimes changed, and the animal advances by an 



[Dec. 



