CHAP. XXII.] 



MOLLUSCA. 



519 



from the East coast of South America. The genera have a 

 somewhat * restricted distribution as follows : — 



Auricula (128 sp.), India, Pacific Islands, Peru and West 

 Indies; Melampus (56 sp.), West Indies and Europe; Cary- 

 chium (9 sp.), Europe and North America ; Plectrotrema (14 sp.), 

 Australia, Malay Islands, China, Cuba ; Blauneria (2 sp.), West 

 Indian and Sandwich Islands. There are many fossil species 

 ranging back to the Eocene formation. 



Family 27.— ACICULIILE. (4 Genera, 65 Species.) (I860.) 



The Aciculidae are small cylindrical shells chiefly found in 

 the West Indian Islands, but with representatives widely 

 scattered over the globe. 



Acicula (5 sp.) is European only; Geomclania (21 sp.), and 

 Chiltya (1 sp.), are confined to the Island of Jamaica ; Trunca- 

 tella (38 sp.),is most abundant in the Antilles, but is also found 

 in some part of each of the six regions, as indicated by the 

 diagram of the family. But few new species have been added 

 to this group. 



Family 2.8.— DIPLOMMATINID.E. (3 Genera, 23 Species.) 



(1865.) 



The Diplommatinidae are minute shells of the Oriental and 

 Australian regions. 

 Vol. II.— 34 



