MOLLUSCA. 55 



spira acuminata, suturis impressis, anfractibus convexis, spiraliter latistriatis, striis planatis, undulatis, inter- 

 stitiis plano-excavatis ; intus extusque alba. 



Hab. Coast of Borneo. 



Chiefly distinguished by its acuminate inflated form. 



2. Sigaeetus insculptus. PI. XIII. Kg. 10. Sig. testa depresso-orbiculari, auriformi, spira fere 

 occulta, spiraliter latistriata, striis planatis, leviter undulatis, interstitiis plano-excavatis ; alba, ferrugineo- 

 luteo pallidissinie tincta, apice purpurascente-cinerea. 



Hab. Eastern Seas. 



The sculpture of this species is similar to that of the preceding, although the shell 

 differs so materially in form. 



3. Sigaketus latifasciatus. PL XIII. Fig. 11. Sig. testa depresso-orbiculari, auriformi, spira 

 brevissima, spiraliter tenuistriata, striis vix undulatis, subtus concava ; albida, fascia latissima cinerascente, 

 apice purpureo-cinerea, aperturee fauce sub fascia castaneo-brunnea. 



Hab. Eastern Seas. 



11. AURICULACEA. 



The habits of this family are somewhat variable. Marinula affects salt-water only, and 

 Pedipes lurks in the cavities of rocks and under stones exposed to the sea. Cassidula is am- 

 phibious, having been observed crawling on a sandy bottom in clear water at a depth of 

 nearly two fathoms, as well as in mangrove-swamps and on the sea-beach. Auricula and Me- 

 lampus live in clamp situations near the sea, and on the muddy banks of rivers. Scarabus 

 inhabits moist situations in woods near the sea, but is wholly of terrestrial habits, living on 

 decayed vegetable matter, and crawling about actively after showers of rain. Alexia and 

 Carychium aboimd in salt-water marshes. 



47. AURICULA, Lamarck. 



1. Atjbicula subula. PL XIY. Eig. 15. Quoy and Gaimard, Yoy. de l'Astrol. pi. 13. f. 39, 40. 

 The head of this species is broad, the muzzle produced and bilobed, the tentacles rather flattened and 

 tapering, and the eyes sessile on their inner bases. Colour of a uniform light grey-brown. 



Hab. Celebes, on the muddy banks of rivers out of the reach of the water. 



The A. subula crawls but slowly. In young individuals the columella is truncate and 

 the outer lip thin. 



2. Melaitpus letjcodon. PI. XIV. Fig. 17. Beck? In this species, which is of a uniform dull 

 pale black, the eyes are small and placed at the inner base of the tentacles, which are flattened, the muzzle 

 is slightly produced and longitudinally cleft, and the end of the foot is slightly bifid. 



Hab. Island of Mayo, from the damp margins of a water-course, crawling over the moist rocks. 



