140 BLRMA, ITS PEOPLE ASD PUODCCTIUXS. 



Onlcr TECTIBRAXCHIATA. 



Gill fonniiig a tuft or plume towards the liiud part of tlic body, under a fcjld of 

 the mantle. Foot elongate, foi-mcd for walking. Marine. 



"Observed (writes Adaras) under favourable circumstances in their native 

 haunts, the Teclihranehiate mollusks are by no moans unattractive or sluggish in 

 their habits, but contribute, by their changing forms and lively colours, to lend 

 animation to the -weedy shores and coral reefs among which they take up their 

 abode. Tiic Bulla there, no longer a shapeless mass of blubber, expands its fleshy 

 foot lobes, and floats leisurely through tlic water ; and crawling on the rocks above 

 the ripple of the sea the green am])hibious Smaragdinella may be observed probing 

 the surface \vith its plastic head disk. Gliding along the surface of the slimy mud, 

 the Pleurohraiichts may be seen, its back splendid with varied colours, or the 

 Operculntum, more sedentary in its habits, fastened by its thick, deep orange foot, 

 studded with pearl-like tubercles, to the bottom of the shallow pools, while gliding 

 briskly over the branches of the corals, the Aphjsm, or sea hares, may be noticed 

 extending their necks, and busily exploring everything within their reach." 



Family Actseonidse. 

 *BnccDfrnjs soLnuiLtis, L. 



,, coccLNATUs, Ecevc. Andamans. 



Famibj Aplustridse. 

 *HrDATrNA VEXiLLUir, Chem. 



Famihj Bullidae. 



*!BrLLA AMPULLA, L. 

 *HAilINi;A lENElU, "W'. Bl. 



* ,, CTMBULUii, (iuoy ct Gaimard. 

 *Atts naucum, L. 



,, CYLrNDBICA. 



R. elongnta, A. Adams. 

 Bulla solida, Brug. 



Family Aplysiidae. 

 Apltsia, sp. 



An undetermined species is not rare on the Arukan coast. TMien molested, it 

 pours forth a quantity of deep violet fluid. 



Order NUDIBRANCHIATA. 



Gills exposed or contractile into cavities on the surface of the mantle. Adult 

 animal shell-less. " While the numerous tribes of mollusks furnished with testaceous 

 coverings olfcr us objects of contemplation remarkable alike for their extreme beauty 

 and the durability of their calcareous envelopes, the scarcely less extensive and 

 certainly far less known families of the Naked-gilled Gastcropods exhibit an astonish- 

 ing variety of form, extreme delicacy of organization, and great diversity of colour 

 to captivate the eye, and occupy the attention of those who wander by tlie shore or 

 explore the depths of the ocean. Clinging to the stems of floating sea-weeds, many, like 

 the Anthohranchs, will be seen extending their flower-like gills of surpassing elegance, 

 exploring with their foliated tentacles or complex mantle tilamcnts the plants aroimd 

 them, the brilliant hues of their striped or spotted bodies glancing through the 

 water. Some will be observed with bodies so fragile and jicllucid (hat you may see 

 the colour of their blood, and count the pulsations of their hearts ; some will be seen 

 to have their gills disposed in rows of papillary tubercles on the sid(!s of their bodies, 

 like the JEolids, or tree-like and branching like the Tritomas. The foreheads of some 

 will be smooth and simple, while those of others will be found adorned with various 



