240 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



about two fifths the length of the animal, and opening, by means of a tube 

 running along the side, at the posterior extremity, between the mantle and the 

 free point of the foot, in company with the anal opening. Organs of genera- 

 tion separate and distant, the male organ protruding at the base of the right 

 tentacle ; the female opening about the middle of the right side. Mucus pore 

 none. No distinct locomotive disk, though by the wide overlapping of the 

 mantle the whole base of the animal is tripartite. 



Shell none. 



There are but few known species of this genus, found in South America, the 

 Philippines, South Africa, and the West Indies and Mexico (whence it ranges 

 into Southern California). Our single Florida species belongs rather to the 

 fauna of tropical than North America. 



The name Vaginula, sometimes used^for the genus, was published several 

 years after Veronicella ; it is now applied to an agnathous genus resembling 

 outwardly Veronicella (Stolicska, Journ. Asiatic Soc. of Bengal, n. s. xlii. 

 Part II., pp. 88-37). 



The anatomy of Veronicella is given in Vol. I. PI. IV. 



The contractility of the animal is very great. When extended it is very 

 long and slender, and smooth or faintly reticulated, three or four times as long 

 las when contracted; in which latter state it has an oblong form, equally 

 rounded at both ends, and its surface is coarsely wrinkled, granular or tuber- 

 culated. The tentacles are generally bifurcate at tip, or rather there is a sup- 

 plementary tentacle or spur, which can be protruded just short of the point of 

 the tentacle ; sometimes the tips are said to be even palmate. In the plate 

 the tentacles are simple (see below, p. 241). 



It lives in families under stones and trunks of trees, and sometimes buried in 

 the earth. It is capable of retiring from damp places, and sometimes inhabits 

 very dry localities. It issues forth in the night and on wet days, when it may 

 be found upon trees. Its movements are very rapid ; no slimy traces are left 

 behind them as in the case of the Limaces. 



The eggs are large and oval, ten or fifteen being joined together in a neck- 

 lace-like gelatinous thread, which is coiled and more or less covered with 

 mucas. 



Jaw (Fig. 140) low, wide, thick, slightly arcuate ; ends but little attenuated, 

 blunt ; cutting margin without median projection ; anterior surface with numer- 

 ous, stout, crowded ribs, denticulating either margin, 24 in V. 

 J^L Floridana. 



$Jj**^""^k Lingual membrane very broad, arranged as usual in the Heli- 

 Jaw of cvn<e, the transverse rows being, however, almost horizontal. By 



Slrito™ Fi 8- P of PL V ' representing V. Floridana, it will be seen that 

 the teeth are of a very peculiar type. 



The lingual membrane is long and very broad, comprising (hi the Florida 

 species) about 60 — 1 — 60 teeth. The centrals have their base of attachment 



