DESCRIPTIONS OF GENERA AND SPECIES 473 



structure has been briefly described and figured by me (48) in T. gaminii. The 

 glands are made up of a much-folded membrane ; their interior is thus divided up 

 into numerous compartments by the folds which seem to anastomose ; the structure 

 of the glands is in fact extremely like that of the calciferous glands. Another 

 character of Typhaeus possibly of generic value, i.e. not confined to the species in 

 which alone it has been recorded, is the fact that there is only a single pair of 

 calciferous glands. 



It is unusual among the Cryptodrilidae for the testes to be limited to one pair : 

 there is no other genus in which this is, as it is in the present, a character which 

 runs through all the species. Corresponding to the single pair of testes and funnels 

 we have only a single pair of sperm-sacs ; these are long and tongue^^shaped and extend 

 through several segments as in many Geoscolicidae. 



The spermiducal glands are long and tubular; the actual mode of their opening 

 on to the exterior has only been studied in T. gammii. In that species, and very 

 possibly in the others, the sperm-duct perforates the body-wall independently and 

 only joins the gland just before the opening of the latter on to the exterior; the cells 

 of the sperm-duct are ciliated up to the point where they perforate the body-wall, 

 after this they lose the cilia. Opening in common with the spermiducal gland on each 

 side of the body is a sac containing a bundle of penial setae. 



(i) Typhaeus orientalis, Beddakd. 



T. orientalis, Beddaed, Ann. Mag. Nat. Hist., Oct. 1893, p. 219. 



Definition, length, 250 mm. Setae strictly paired. Genital papillae between segments 



XIII/XVIL XVIII/XX, on a line with ventral setae. Intestinal glands five pairs. 



Hal. — Neighbourhood of Calcutta. 



I have described the outer pair of setae as being absent from the clitellar segments 



of this species ; as, however, I have had no opportunity of verifying this upon fresh 



material I do not utilise the character, if it be really constant, as part of the definition 



of the species. The gizzard appeared to occupy two segments, the septum dividing 



which has aborted as in the genus Perichaeta (s. s.); there are only two specially 



thickened septa, which lie between segments v/vii. The last heart is in segment xiv (?)'. 



(2) Typhaeus gammii, Beddaed. 

 T. gammii, Beddaed, Q. J. M. S., vol. xxix, 1889, p. 11 1. 

 Definition. Length, about 2,^0 mm.; thickness up to half-an-inch. Setae strictly paired. 



' See remarks upon the following species. 



3P 



