DESCRIPTIONS OF GENERA AND SPECIES 687 



which has given its name to the species the presence of numerous papillae. There 

 is nothing said about their minute structure ; the number and arrangement seems to 

 me to be in all probability a specific character. The numerous gizzards, the last of 

 which is situated in the eighth segment, are a peculiarity of the genus, unique in 

 the family. 



Bilimba papillata, ROSA. 



B. papillata, ROSA, Ann. Mus. Civ. Geneva, vol. x (2 a), 1890, p. 386. 



Definition. Length, loomm.; diameter, $mm.; number of segments about 330. Prostomium 

 not at all imbedded in buccal segment. Papillae: eight median, unpaired on XIXIF, 

 XVII, XXVI-XXVIII; seven pairs on XIII-XVII, XXIV, XXV. Hab.Cobapo, 

 Burmah (1000-14,000 feet above sea-level). 



The body of this species, as in several other Geoscolicids (e. g. Criodrilus), is 

 quadrangular in section posteriorly. 



FAMILY LUMBRICIDAE. 



DEFINITION. Terrestrial (rarely aquatic) Oligochaeta, usually of moderate size; 

 setae eight in number in each segment. Male pores on XII, XIII or (most 

 generally) XV. Clitellum, saddle-shaped, commences some way after the 

 segment bearing the male pores. Dorsal pores present. Gizzard always single, 

 placed at end of oesophagus. Nephridia paired and all similar. No spermi- 

 ducal glands or penial setae. Tubercula pubertatis nearly always present. 

 No supra-intestinal blood-vessel. 



This family of Oligochaeta is one of the most easily to be characterized. Though 

 it contains a large number of species the range in variation of structure is very 

 small ; so much so that the division of the family into genera is a matter of 

 difficulty. I have eliminated from the present family the genus Criodrilus, the 

 reasons for which proceeding will be found stated on p. 666. 



The Lumbricidae are, nearly all of them, worms of moderate size. Allolobophora 

 gigas is the only species which vies with some of the gigantic earthworms of the 

 tropics. On the other hand, there are a few very small species. 



