CHAP. XXII.] 



MOLLUSCA. 



517 



FAMILY 23. LIMACID^E. (12 Genera, 116 Species.) 



GENERAL DISTRIBUTION. 



The Limacidae, or Slugs, are widely distributed, but they are 

 absent from South America, where they are represented by the 

 next family. They also seem to be absent from the greater part 

 of Africa. The genera are distributed as follows : 



Limax (51 sp.), Palaearctic region, Australia, and the Sand- 

 wich Islands ; Anadenus (2 sp.), Himalayas ; Philomychus (9 sp.), 

 North America, China, and Java; Arion (25 sp.), Norway to 

 Spain and South Africa ; Parmacella (7 sp.), South Europe, 

 Canary Islands, and North India ; Janella (1 sp.), New Zealand ; 

 Aneitea (1 sp.), NewHebrides and New Caledonia ; Parmarion 

 (4 sp.), India ; Triboniophorus (3 sp.), Australia ; Testacella\3 sp.), 

 South Europe, Canary Islands, and New Zealand; Hyalimax 

 (2 sp.), Bourbon and Mauritius; Krynickia (8 sp.), Eastern 

 Europe and North America. A few species of Limax, Arion, and 

 Testacella have been found fossil in Tertiary deposits. 



FAMILY 24 ONCIDIAD^E. (2 Genera, 36 Species.) 



GENERAL DISTRIBUTION. 



The Oncidiadae, or Slugs with a coriaceous mantle, inhabit 

 the Oriental region, Mauritius, Australia, the Pacific Islands, 

 South America, and South Europe. The genera are : 



