Enrlhivorm from Kcundur. 239 



first somite, so tliat the first cliaiti^c.ious somite; is the tliinl. 

 All the clia'tai are ornamented in the manner characteristic 

 tor the ^enns, and somewhat simihir chaUaj are loini'l in Uro- 

 chata^ Deodrilus'* J and OniiclioclKVta {DiacfuHa) Windleiji ^, 

 in AnteusX and Geoscole.v^, and in Microchceta papillata and 

 M. Belli (BenUam). 



The ornamentation, which consists of a series of trans- 

 versely-arranged crescentic ridges, is not so pronounced as 

 wouUl appear to be the case in other sj)ecies ; indeed, when 

 the chajtai are mounted in glycerine, the markings might 

 easily be overlooked with a low power, but in spirit and 

 water they are distinctly visible. There are no specially 

 modified " copulatory " chsetce, such as exist in the other 

 species, where they are larger and straight, in R. paradoxufi 

 on somites xvi. to xix. and in R. Guliehnua on the clitellum, 

 or larger and more distinctly marked in A'. Tenhatei ] nor do 

 I find any fascicles of chajtaj such as Horst described in his 

 specimens on somites xvii., xviii., and xix. 



Tlie 2)rostonnum appeared from the exterior as a small 

 rounded lobe, but on dissection was found to be i-etracted, as 

 Beddard found to be the case in his species : it is some 

 two or three times as long as the organ in the majority of 

 earthworms. 



The clitellum is very distinctly marked, partly from its 

 colour, but chiefly from the thickness of the epidermis and 

 the deep, conspicuous, intersegmental grooves ; it is, as in 

 the other species, " incomplete," and occupies somites xiv. to 

 XXV., the last two somites, however, being less distinctly 

 modified on the animal's left side. The latero- ventral 

 boundary of the clitellum is nearer the middle line on somites 

 xiv. to xix., and here involve the inner couple of ch£eta3 ; on 

 the posterior somites xx, to xxv. the edge of the clitellum is 

 bordered by a series of glands — the tubercula puhertatis — 

 forming a semitranslucent band placed between two coujjles of 

 chretse, though nearer to the inner couple. A similar band 

 exists in the other species, and in the case of ilorst's and 

 Perrier's species appears to be the only representative of the 

 clitellum, the animals not being quite mature. In R. Ten- 

 A-a^f*?' the seven pairs of tubercula traverse somites xx. to xxvi. J, 



* Beddard, Quart. Journ. Micr. Sci. xxxi. p. 467. 



t Beddard. ibid. p. 15!.», 



t Horst, ' Notes from the Lejdeii Museum,' vol. xiii. 



§ Beddard, ' Annals,' Feb. l6!J2. 



II I may say that Horst apjiears in some doubt as to his numbers, as 

 he places the tubercula on " i^Oth (21st)-26th (27th)" ; again, he men- 

 tions an " olive-grten ring arouud the body from the 12th (llth)-15th 

 (IBtli) sesnient."' 



17* 



