472 OLIGOCHAETA 



segment at which they first appear. Rosa examined only two immature examples and 

 his account of the species is therefore not very full. 



(5) Pontodrilus phosphoreus (Duges). 



Lumbricus phosphoreus, DuGiis, Ann. Sci. Nat. viii (a), 1837, p. 17. 

 Photodrilus phosphoreus, GlAKD, C. R., 1887, p. 87a. 



Definition. Length, ^omm.; diameter, % mm.; momber of segments, 110. Setae in eight 

 rows. Clitellum, XIII-XVII. Hearts in X-XII. Sperm-sacs in XI, XII. Spermathecae 

 in IX 2vith a diverticulnm. Hah. — France. 



This species has been investigated by Giakd, who however has not yet published 

 an illustrated account of his researches. The main facts in its structure are given 

 in the above definition. In addition to the points there mentioned there exist on 

 segments xii, xiii, and xviii sacs of modified setae in addition to the ordinary ventral 

 setae; instead of a bundle of about four setae there is sometimes only a single seta. 

 This worm appears to be luminous at night, whence the name given to it by DuGiis. 



Genus Typhaeus, Beddakd. 



Definitiobt. Clitellum, XIII-XVII ; male pores on XVII. Nephridia diffuse. 



Testes and funnels a single pair. Spermathecae a single pair. Spermiducal 



* 

 glands tubular, furnished with penial setae. 



This genus was founded by myself in 1883 for an earthworm from Calcutta; since 

 that time four additional species have been made known by Bourne (3), Rosa (8), 

 and myself (48)- Without exception all the species of the genus are natives of 

 India, Ceylon, and Burmah. Although the above definition will serve to distinguish 

 Typhaeus from any other genus of the Cryptodrilidae, there are other characters 

 which are very possibly of generic value, in addition to those already made use of. 

 I have not used these in the definition inasmuch as no definite statements have been 

 made about certain of them in the two species examined by Rosa, which were in 

 a very poor condition for anatomical examination. In all the three species of whose 

 anatomy we possess at all suflicient data the intestine is furnished with a series of 

 about six pairs of reniform glands lying on its dorsal surface. I have described these in 

 T. orientalis and T. gammii ; Bourne has referred to them in T. masoni ; their minute 



