102 TAYLOR : LIFE HISTORY OF HELIX ASPERSA. 



The dorsal line of tubercles are noticeably paler than the 

 adjacent parts. Upper tentacles long and slender, divergent very 

 finely tuberculous and similar in colour to the back, bulbs well de- 

 fined and globular, with the black ocular speck at their extremity. 

 Lower tentacles about a quarter the length of upper pair, only 

 slightly bulbous at the extremity. Mantle of a blackish- grey, 

 closely and finely sprinkled with pale greyish-yellow. 



Anatomy. 



I am indebted to Mr. Scharff and Mr. Ashford for much 

 of the following complete account of the anatomy of this 

 species : — 



The jaw is described and figured by Binney, Moquin- 

 Tandon, and other authors, as having six or eight separated ribs 

 similar in character to H. arbustorum. 



' My own observations do not agree with these results, the 

 thickenings appearing to be more of the nature of folds, as an 

 examination of the plate will show. 



The jaw is 3 mill, wide, strongly arcuate, high and thick, 

 ends rounded, somewhat attenuated with six decided denticula- 

 tions, most strongly pronounced on the convex margin, there 

 are four other indistinct crenulations in addition to the central 

 rib. The color is yellowish-horny, deepening in the thicker parts 

 of the jaw to dark black-brown, the striation is most visible on 

 the upper part and is parallel with the margin. 



The Lingual ribbon is long and narrow, the formula in 

 specimen examined by me was ^^ '-'^ = 9729. 



The central tooth has a base of attachment longer than 

 wide, with a concave lower margin, the upper margin is broadly 

 reflected with a stout median cutting point, which has also a 

 small lateral one at each side. 



The Laterals have the lower lateral angle of the base of 

 attachment deficient, a little further in the series a second outer 

 cutting point is developed, which gradually approximates in size 

 to the first one, 



J.C, iv., Oct. 1883. 



