250 W. B. BENHAM. 



as the coil of the tubule is larger and more compact ; it serves 

 probably as an extra-buccal pepto-nephridium. Both Leuckart 

 and Perrier were unable to see the nephridiopores in front of 

 the fourteenth somite, but nephridia are present although the 

 pores are difficult to see.] 



Species 1. G. maximus, Leuckart, 1841 ( = T. brasiliensis, 

 E. P., 1872), Brazil. 

 2. G. forguesii, E. P., 1881 ; La Plata. 



See Leuckart, ' Zool. Bruchstilcke,' Stuttgart, part ii, 1841 ; 

 Perrier (Titanus), ' Nouv. Arch.,^ &c., viii, 1872; and ibid., 

 ix, 1881, foot-note, p. 235 ; Rosa, ' Boll. d. Mus. Zool. ed 

 Anat. Comp. Univ. Torino,' iii, 1888. 



Genus 22. Uroch^ta, E. P., 1872. 



Setae eight; anteriorly in couples, then they gradually 

 become separate ; and finally, alternate in consecutive somites. 



Clitellumon Somites xiv to xxii, complete veutrally; inter- 

 segmental grooves not obliterated. 



Spermiducal pores between Somites xx and xxi (on 

 Somite xx, E. P. ; between xix and xx, Rosa). 



Nephridiopores in line with the 3rd seta. 



Sperm-sacs, one pair, occupying Somites xiii to xv, or 

 even more. 



[Prostomium appears to be absent. 



Penial setse on Somites xix, xx, xxi, and xxii. 



Testes and ciliated rosettes in Somite xii. 



Three pairs of spermathecae, in Somites vii, viii, ix (Rosa), 

 VI, VII, VIII (Beddard, Horst), or viii, ix, x (Perrier). 



The nephridia, except the anterior pair, are simple, slightly 

 coiled tubes, without any or only with very feebly developed 

 duct. 



The anterior nephridia are massed together to form " pepto- 

 nephridia,'^ the tubules of which open at one end into the 

 coelom by ciliated funnels, and at the other into a large duct 

 which communicates with the exterior in front of Somite iii. 



The gizzard occupies Somite vii ; and there are three pairs 

 of flask-shaped calciferous diverticula, in Somites viii, ix, x. 



