462 ZOOLOGY. 



MOLLUSC A. 



OCEANIC MOLLUSC A OBTAINED OFF THE S.E. COAST 

 OF ARABIA. 



Class PTEROPODA. 



1. Hyalcea uncinata, Eang. 



2. H. longirostris, Lesueur. 



3. Spirialis trochiformis, D'Orb. 



Scarce. 

 Abundant. 



Eare. 



4. Styliola comiformis, D'Orb. 



Not abundant. 



Class GASTEEOPODA. 

 5. Litiopa homhyx, Eang. 



Not very common : attached to floating weed. 



Class HETEROPODA. 



6. lanthina fragilis, Lam. (not Eeeve). 

 Syn. /. roseola, Ev. and I. affinis, Ev. 



Common : tbe variety is that called /. roseola by 

 Reeve, but it appears to be merely a variety of fragilis. 



