644 OLIGOCHAETA 



This species was first described by LEUCKAKT, as has already been mentioned ; 

 ROSA has, however, conclusively shown that PEEEIEE'S T. brasiliensis is the same 

 species. He has elaborately compared by extensive quotations the descriptions given 

 by the two authors; the result of which is to show the identity of the worms 

 described by both. It will be unnecessary to repeat this comparison here. 



The worm is one of the largest known ; LEUCKAKT considers that during life it 

 may have been able to extend itself to eight or nine feet; the dimensions given in 

 the definition of the species are sufficiently large. 



The fact of the ornamentation of the setae is not noted by PEERTER ; it was first 

 described by myself (28) ; at about the same time, ROSA discovered setae upon the 

 clitellum, which were to be distinguished by their slightly greater size, and by the 

 ornamentation of the free extremity ; he implies that the ordinary setae of the body 

 do not show this ornamentation, though there is no positive statement upon the 

 matter ; it is not so, however. 



The male pores are upon the eighteenth segment ; the oviducal pores have been 

 found by ROSA, who places them upon the fourteenth segment behind seta z. 

 LEUCKAET had, however, previously noted their occurrence on that segment. 



The alimentary canal is furnished with a single pair of calciferous glands in 

 the thirteenth segment ; these were at first taken by PEREIEE (3) for a part of the 

 circulatory system, but the error was afterwards rectified, as I omitted to point out 

 in correcting it (unnecessarily) myself (28). The last hearts are in xii. The testes 

 are presumably a single pair, as in any case the sperm-ducts are. The latter open on 

 to the exterior by means of a thick-walled chamber, occupying three segments and 

 constricted where it passes through the septa. 



(2) Geoscolex forguesi (PERRIEE). 

 Titanus forguesi, PEEEIEE, Arch. d. Zool. Exp., 1880, p. 217, footnote. 



Definition. Length, 100 mm. Clitellum, XF-XX1I. Sperm-sacs enormously long. Hah. 



La Plata. 



This species is at present very imperfectly known ; we have only a few notes 

 upon its anatomy chiefly contained in a short footnote appended to PEREIEE'S 

 memoir upon Pontodrilus. It agrees with the last species in some important 

 characters, but appears to differ in others, which might be thought to be of generic 

 value. Thus there is, as in G. maxlmus, a single pair of calciferous glands in the 

 thirteenth segment ; the last pair of hearts are in xii, and, are like the preceding pair, 

 connected with the supraintestinal as well as with the dorsal vessel ; the absence of 



