320 



A MANUAL OF AMERICAN LAND SHELLS. 



of this species iu the act of lying its eggs iu a damp place uuder a log. 

 He transferred them, with the aiiijual, to'a tiu box filled with wet moss. 

 The eggs were not much more than half as large as those of ilf. alho- 

 labris, Say; they were white, adhering together very slightly, flaccid, 

 and apparently not entirely filled with fluid. During the succeeding 

 night the number had increased to about fift}', and in a few hours they 

 became full and distended. As the snail now began to devour the eggs, 

 he was obliged to remove it. On the 29th of July all the eggs were 

 hatched. The youug snails had H whorls; the umbilicus was open; the 

 head, eye-peduncles, and tentacles were bluish-black, and the other 

 parts whitish and semi-transparent. They immediately began to feed, 

 and made their first repast of the pellicle of the eggs from which they 

 had just emerged. They grew rai)idly, and before the middle of Octo- 

 ber, when they went into winter quarters, they had increased their bulk 

 four or five times beyond its original measurement. 



(See 



Fig. 344. 



Jaw of JI. Sayii. (Morse.) 



Jaw as usual in the genus ; 15 ribs, 

 figure.) 



The lingual membrane (Terr. Moll., V, 

 Plate VIII, Pig. B) has 42-1-42 teeth, with 

 about 15 i)crfect laterals; the change irom 

 laterals to marginals is made without the splitting of the inner cutting 

 i'''«- •'''15- point. The centrals and first laterals have, 



no distinct side cusps and cutting points. 



Genital system (see Leidy, /. c.) very re- 

 markable for the enormous development of 

 the penis sac; it is stout, cylindrical, as long 

 as the whole genital system, receiving both 

 M. chiihoiveensis. rctractor musclc and vas deferens at its sum- 



mit; genital bladder large, elongate-ovate, on a very short duct. 



The large form from the North Carolina and Tennessee mountains, 

 here figured, was called H, Ckilhoiceensis by Dr. Lewis. He says of it : 

 n. Chiihoiveensis differs from typical ^cf^/ii in having a cubic capacity 

 more than five times as great, smaller or more rudimentary teeth, a 

 wider development of the reflected lip on the base, and iu several other, 

 less important details. The greatest diameter of the most perfect shell 

 before me is about 1.40 inches." (Lewis.) (See also Proc: Acad. Nat. Sei. 

 Phila., 1875, 334.) 



The dentition and genitalia of this form* are figured in Bull. Mus. C. 

 Z., y, No. 10, Plates I and II. The [)euis sac is greatly developed. 

 * Similar to that of the type, 



