280 W. B. BENHAM. 



Family I. — TypHyEiD^. 

 Fig. 1. — Typhseus. The drawings, both the alimentary and 

 the genital systems, are taken from the descriptions and figures 

 of T. gamraii by Beddard, 'Quart. Journ. Micr. Sci.,' xxix, 

 p. Ill, and pi. xii. 



In fig. 1 a, the small sac (ps.) in Somite xvii represents the special sac 

 with penial setse, the external aperture of which is shown in fig. 1 c, in front 

 of the male pore on each side, which is indicated by the large black dot, pro. 

 is the prostate, which joins the sperm-duct before the latter opens externally. 

 The outlined structures in Somite viii are the spermathecae. 



In fig. 1 b, the gizzard is shown in Somite vii ; the calciferous diverticula 

 in Somite xii (Ca.). The sacculated intestine commences in Somite xvi. 

 EPN. is the extra-buccal pepto-nephridial network, which is shown in thicker 

 lines than the remaining network. 



Fig. I c, represents Somites xvi, xvii, and xviii seen externally, when 

 flattened out ; showing the arrangement of the setse, the numerous nephridio- 

 pores (as small dots), the penial setse in Somite xvii replacing the ordinary 

 setse ; and behind these the large black dots indicate the male pores. 



Distribution of the genus : India. 



Fig. 2. — Megascolides. Modified from the drawings of 

 M. australis, McCoy, given by Baldwin Spencer in ' Trans. 

 Roy. Soc. Victoria,' vol. i, pi. i. 



lu fig. 2 a, the four pairs of lobed, dotted structures marked s., in Somites 

 XI, Xll, XIII, and xiv, represent the sperm-sacs. peo. is the coiled prostate. 



In fig. 2 ^, the plectonephric condition is seen, the network in Somites i 

 to IV communicates with the pharynx by small ducts, and forms an " intra-buccal 

 pepto-nephridial network " (iPN.). G. is the gizzard in Somite v. In Somites 

 XII to xviii the pouched intestine is shown (pp.), the sacculated, non-typh- 

 losolar intestine commencing in the next somite. 



Pig. 2 c, represents Somites xvii, xviii, and xix externally, showing setae, 

 nephridiopores, and the male pores which are in xviii. 



Distribution of the genus : Australia. 



Fig. 3. — Cry ptodrilus. a. Genital system, modified from 

 the figure of C. f letcheri, given by Beddard in ' Proc. Zool. 

 Soc.,' 1887, p, 547. pro., the prostate, h. Alimentary system, 

 composed from Beddard's description of C. fletcheri in 

 ' Proc. Zool. Soc.,' 1887, and from Fletcher's description of 

 various species in ' Proc. Linn. Soc. N.S.W.' 



The gizzard occupies two somites, ca. The first of the four calciferous 

 diverticula on each side. The sacculated intestine commences in Somite xvi. 



The plectoncphridia are not continuous from somite to somite. 



Fig. 2 c, represents any three somites behind the male pores, showing the 

 setse : the nephridiopores are probably numerous and irregular. 



Distribution : Australia. 



