1901.] AND ARRANGEMENT OF EARTHWORMS. 195 



Polytoreutus gregorianus ^ 



P. gregorianus P. E. Beddard, Monogr. Oligoch. 1895, p. 612. 



Length 2.30 mm., breadth 9 mm. ; Bumber of segments about 

 450. Setae very widely apart in A^entral couples, closely approxi- 

 mated iu lateral. S pore xvii./xviii. ; spermathecal pore on 

 xix. A glandular eminence upon median ventral surface of seg- 

 ments xix.-xxxiv. Dorsal blood-vessel double in some of anterior 

 segments. Sperm-sacs thread-like for anterior two-fiftbs, wide 

 and sacculated after, and fused at posterior extremity. Spermi- 

 ducal glands hardly sacculated, divisible into a shorter terminal 

 part and a longer cylindrical distal region. Spermathecal sac 

 median, unpaired, with two anterior and two posterior diverticula. 



Hah. Giriama, E. Africa. 



2. A Contribution to the Knowledge of the Earthworm 

 genus Typhoeus. 



This genus of Earthworms was founded by me ^ some years 

 since for the reception of a single specimen of an earthworm from 

 India. Later ^ my own description of a second species as well as 

 the investigations of Bourne ■*, Eosa ', and Michael sen ^, fully estab- 

 lished the validity of the genus, which the last naturalist would 

 regard as the type of a separate subfamily. The name which 

 I originally wrote, iu conformity with the Greek, Typhoeus^ was 

 erroneously altered into Typhoeus, and subsequently into Typhaus, 

 both of which are clearly wrong. It should obviously be written 

 as in the present communication. 



This genus is Indian, Burmese, and Ceylonese in habitat. It is 

 perhaps, as Michaelsen has pointed out, closely related to such an 

 Acauthodrilid as Ociochcetiis. But its characteristics do not allow 

 of its being merged into that or any other genus, as the additional 

 observations which I have to offer here amply confirm. I shall 

 commence with the description of two new species lately received 

 by me, and conclude with a revision of the whole genus, which 

 now contains seven distinct species. 



Typhoeus nicholsoni, n. sp. 



Of this apparently new species of the genus, I have examined 

 three fully mature individuals. These I have received through the 



1 Named after Prof. J. W. Gregory of Melbourne University. 



^ " Note on some Earthworms from India," Ann. Nat. Hist., Oct. 1883, p. 219. 



^ " On the Structure of three new Species of Earthworms, &c.," Quart. Journ. 

 Micr. Sci. vol. xxix. p. 111. 



* "On certain Earthworms from the Western Himalayas and Dehra Dun," 

 J.A.S.B. Iviii. p. 112. 



" " Viaggio di Leonardo Fea in Birmania e Eegioni Tieine: xxv. Moniligas- 

 tridi, Geoscolicidi ed Eudrilidi," Ann. Mus. Civ. Genova, (2) ix. p. 23 ; and " Die 

 exotischen Terricolen des k. k. naturh. Hofmuseums," Ann. k. k. Hofm. Wien, 

 Ti. p. 388. 



'^ " Die Terricolenfauua Ceylons," JB. Hamb. wiss. Anst. x. p. 90 ; and " Oligo- 

 chpeten von Inseln des Pacific, &c.," Zool. Jahrb., Abth. f. Syst., xii. p. 241. 



