OLIGOCHAETA 



chambers divided by a constriction, into which is inserted the sperm-duct ; it is the 

 posterior chamber which opens externally. The anterior is called by ROSA. ' Bulbo 

 del pene,' the posterior ' borsa copulatrice ' ; between the two, as already said, are 

 inserted the two spermiducal glands which open in reality into the anterior. The 

 anterior chamber of the copulatory apparatus has thick walls lined by a low 

 epithelium, and formed principally by a layer of muscle disposed in alternately 

 longitudinal and circular directions ; ROSA suggests and I think with much reason 

 that this is the homologue of the ' Y-shaped gland ' of Eudrilus, and in that case 

 it will, on my view, be really comparable to the muscular sac found opening on to 

 the penis of Stuhlmannia. The fibres of the muscular walls of the terminal 

 chamber of the male efferent apparatus are mainly longitudinal in direction ; this gives 

 to the organ a ' mother-of-peaii ' appearance when viewed without magnification. 



The dorsal vessel of Teleudrilus is double in the anterior segments of the body, 

 as far back as the fourteenth segment, but the two halves are united at each 

 dissepiment. The nephridia open on to the exterior by visible orifices. 



Teleudrilus ragazzii, ROSA. 



T. Ragazzii, ROSA, Ann. Mus. Civ. Geneva (2 a), vi, 1888, p. 572. 



Definition. Length, 100 mm.. ; breadth, 4 mm. ; number of segments, 145. Clitellum, 

 XIF-XFII. NepJiridiopores open by dorsal series of setae, commence in V. Gizzard in 

 VII. Last hearts in XI. Hal. Let-Marefa, Scioa, Abyssinia. 



The anatomy of this worm is to a great extent figured by ROSA in his only 

 paper upon the species. 



FAMILY GEOSCOLICIDAE '. 



DEFINITION. Oligochaeta of various sizes, sometimes aquatic. Setae 8 in a 

 segment, paired or irregular in arrangement. Clitellum saddle-shaped except in 

 Diachaeta and Ilyogenia, usually rather extensive, often furnished with modified 

 setae. Nephridia always paired, rarely more than one pair in a segment. 

 Gizzard anterior. Male pores generally within the clitellum, with or without 

 spermiducal glands. Spermathecae without diverticula. 



1 KOSA writes the name of the family Gcoscolcciclae. 



