CHAPTER XIV. 
NON-PULMONARY GASTEROPODS. 
“ Ame tout aqueu poble eimable e banara.” 
Reybaud. 
In this family we reach a group of Gasteropoda much more 
Numerous, both in species and in special types, which respire by the 
aic l of branchiae, or gills. Cuvier divides them into many orders, 
leased chiefly upon their respiratory organs. But we must limit our- 
selves to describing the curious shells belonging to the groups of 
'^(■HhrancJdm, Pectinibrcinchise, aud Cyclobraneliiw. 
The Tectibranchhe have the gills attached either to the right side 
®f the body or upon the back, arranged in the form of leaflets, more 
°r less divided, but not symmetrical, and nearly covered by the mantle. 
Bulla and Aplysia are the two principal genera of the group, and 
nifty be considered as the type ol two small families. 
The Aplysise were known to the ancients under the name of sea- 
^ftres (Lepus mar inns), from some fancied resemblance to the terres- 
trial hare. They were objects of profound horror, inspired either by 
their singular form, or from an acrid, caustic, and inodorous liquid 
H'hich they secrete. A magic influence was attributed to them ; they 
We re supposed, for instance, to have influence over the female heart. 
It is not easy, however, to explain the evil renown acquired by an 
a uimal which is known to be gentle and even timid. They are naked 
ai iil fat, somewhat resembling the Limneans in their oval, elongated 
t°rrn, their thickness in the dorsal region, and their posterior locomo- 
ti°n. Their head, which is very indistinct, is furnished with four 
tentacles, the anterior two of which are the largest, and somewhat 
r esemble the earn of a hare. The eyes are found at the base of the 
Posterior tentacles. These characters are observed in Aplysia depilans 
