246 On an Earthworm from Ecuador. 



?). Male pores xix./xx. 



4. Tlie distance between the two couples of chjette of one 



side is i^reater than that between the right and left 

 ventral couples. There are no copulatory cha3t£e. 

 The chse.tie commence on somite iii. 



5. The first nephridium opens into the buccal cavity. 



0. The gizzard lies in somite vii. ; there are seven pairs of 

 intestinal diverticula. 



7. There are three ])airs of " lateral hearts " and two pairs 



of " intestinal hearts." 



8. The two pairs of sperm-sacs are not confined to the 



somites in which the testes lie ; there are four pairs of 

 globular spermathecte in somites v., vi., vii., viii. 



EXPLANATION OF TLATJ-] X. 



Fiy. 1. \'entral surface of the anterior end of lihiiiodrilus ecuadoriensis. 

 neph.pi^, pore of second uephridiuin ; Fro., prostoiuium repre- 

 sented in a protruded condition; ^pth., sperraathecal pores; 

 tub., tubei'cula pubertatis ; (^ , male pore. 



F'uj. 2. Semi-diagrammatic view of a lonrritudinal section, derived from 

 a studv of a dissection. The left side of the animal and the left 

 s])erm-sacs are removed ; the organs of the left side only are 

 shown with the exception of the sperm-sacs, those of the right 

 side being seen. The septa and blood-vessels are omitted for 

 clearness' sake, and only the anterior nephridia are represented. 

 S indicates the pore of the left sperm-ducts ; cer., the cerebral 

 ganglia; com., i\\^. circumpharyngeal nerve-commissure: div.\ 

 the fourth intestinal diverticulum; g.', the subphar\Tigeal 

 ganglion ; c/iz., the gizzard ; ?/(., mouth ; n.-, ii.'^, the second and 

 fifth nephridia ; u.c, ventral nerve-cord; n.o., nepliridiopore ; 

 7i.t., convoluted tube of a nephridium ; )i't., convoluted tube 

 of the " peptonephridiuni ; '" p.n.d., the duct of the pepto- 

 nephridium, dissected out and entering the buccal cavity ; j)ro., 

 prostomium, partially retracted; r.m., radiating muscles of 

 pharynx; sal., " salivaiy glands" around the pharynx; sp.d., 

 sperm-duct ; sp.s.', sp.s.'-, the anterior and posterior sperm-sacs 

 of the riglit side ; spth.^-^, the four spermathecie j t.s., "testi- 

 cular sacs,'" enclosing testes and rosettes. 



Fiy. '^. Dorsal view of the tubular region of the intestine, with the seven 

 pairs of " diverticula " {div.\ div.\ div.') and the vascular system 

 of the region. D.v., dorsal blond-vessel ; /./)., the two pixirs of 

 intestinal hearts (from the supra-intestinal vessel) ; /./»., the 

 three ]iairs of lateral hearts ; s.i., sacculated intestine ; t.i., 

 tubular intestine. 



!)(/. 4. The jieptonephridium removed entire from the body. ]>u.d., tlie 

 duct ; pnf., the funnel ; pfi.t., outline of the mass of convoluted 

 tubules: the convolutions are very complicated, and the wluile 

 is covered by a dense network of blood-vessels, botii of wliieli 

 are omitted, t hi ugh a small portion of the tubule is slunvn 

 at f. 



