12i MANUAL OF NATURAL HISTOKY. 



2. Family. — Pneumoderms (Pneumodermonidse). 



Body fusiform ; head with arms furnished 

 with pedicellate suckers ; wings two, with a 

 central foot-like appendage ; gills on hind 

 part of body. 



3. Family. — Cymodoceas (Cymodoceidse). Body 



divided into two parts ; wings four, two on 

 each side, at the junction between head and 

 abdomen, with a foot-like appendage. 



GASTEROPODS. 



The Gasteropods, comprising the tribes of the 

 spiral shell-bearing Mollusks, will be eagerly sought 

 after by the enterprising traveller on account of 

 their rarity and beauty, nor will he have to look in 

 vain for traces of their whereabouts. 



On the bosom of the ocean fleets of purple Ian- 

 thince and sprightly Atalants, with clear transparent 

 shells, and sometimes a Glassy-Nautilus (Carina- 

 ria), swift and rapid in its movements, will be no- 

 ticed on his outward voyage ; nor will the pelagian 

 Dorids and Eolids that occupy the stems of floating 

 sea-weeds escape his observation. 



Wandering amid the labyrinths of tropical forests, 

 he will discover, sheltered by the leaves, or hid 

 among the fissures of the bark, showy-looking Bu- 

 limi, and fine banded Snails, while active Nanince, 

 with their truncate, glandular tails, will be seen 

 among the foliage of the lower bushes, or hiding in 



