302 W. B. BENHAM. 



Family VII. — Geoscolecid^. 

 Fig. 21. — Geoscolex (Titanus). a. On the left genital 

 system, o. Ovary, od. Oviduct. No spermathecEe are known. 

 Modified (in accordance with my own observations) from 

 Perrier^s figure of G. maxim us, Leuckart (T. brasiliensis, 

 E. P.), in Nouv. Arch. Mus. d'Hist. Nat./ viii, 1872, pi. i, fig. 

 15. b. On the right alimentary system, g. Gizzard, ca. 

 Calciferous diverticulum, s. Commencement of sacculated 

 intestine. The first nephridium is slightly different from the 

 rest, and forms an extra-buccal pepto-nephridium, epn., the 

 coiled tubule being more compact, and the cfecal part of the 

 duct shorter, nn. The anterior nephridia, in which the 

 tubule leaves the duct about halfway along its length, n.^ 

 The posterior nephridia, in which the tubule joins the ciecum 

 near its external aperture. Composed from my own observa- 

 tions, c. Exterior of four somites : a.a. from the anterior part 

 of the body, where the setse are in couples; b.b. from the 

 posterior region, where the setse are separate. 

 Distribution : Brazil. 



Fig. 22. — Urochseta. a. Genital system. Composed from 

 Beddard^s description in ' Quart. Journ. Micr. Sci.,' xxix, 

 p. 246. sp. The first spermatheca. h. Alimentary system, g. 

 Gizzard, ca. Calciferous gland, s. Commencement of the saccu- 

 lated intestine. Composed from my own observations. The 

 nephridia are modified from Perrier's figures of U. corethrura 

 in ^ Arch. Zool. Exp.,' iii, 1874. The first nephridium (epn.) 

 is much larger than the following ones, both the tubular 

 portion and its duct being greatly developed ; there are at least 

 three funnels to this extra-buccal pepto-nephridium. c. View 

 of four somites, namely, vi, xx, and two consecutive more 

 posterior somites (pp.), in order to show the couples of setae 

 anteriorly, and the scattered and alternate arrangement of these 

 posteriorly. In Somite xx, in which the spermiducal pore is 

 situated but not shown, the ventralmost setae (No. 1) are 

 replaced by groups of larger penial setae. After Beddard, 

 ' Proc. Roy. Soc. Edinb.,' xiv, 1887, p. 162. 



Distribution : South America and neighbouring islands 

 also Australia, Sumatra. 



