DESCRIPTIONS OF GENERA AND SPECIES 465 



(n) Microscolex papillosus (NEW SPECIES). 



Definition. Length, 87 mm.; diameter, 3 'turn.; number of segments, 95. Setae paired. 

 Prostomium incomplete. Clitellum, XIII-XFI. Dorsal pores absent. Genital papillae 

 upon VII-XVII, median unpaired. Gizzard in V. Sperm-sacs in IX, XL Testes 

 in X. Spermatkeeae in IX, with, spiral diverticulum. Sperm-duct opens just free from 

 spermiducal gland. Penial setae of enormous length (10 mm.), unornamented. Hub. 

 UscAiiia, S. America. 



This species is another of those which have a purple colour. Just in front of the 

 male pores is a deep depi'ession of the integument. This is attached by muscular 

 fibres to the dorsal parietes, and is lined by a tall columnar epithelium. It probably 

 serves as a sucker. The male pores and those of the spermiducal glands open upon 

 very prominent papillae. The diverticulum of the spermathecae ends in a swollen 

 extremity which alone is glandular in structure, being lined by a much-folded 

 epithelium. 



(ia) Microscolex gracilis (NEW SPECIES). 



Definition. Length, 72 mm.; diameter, 2 mm.; number of segments, 88. Setae distant. 

 Prostomium incomplete. Clitellum, XIII-XVI. No dorsal pores. Gizzard in VI. Sperm- 

 xii en in XI. Testes in X. Spermathecae in IX, u-ifh a single stalked diverticulum. 

 Sperm-duct opens into duct of spermiducal gland at some distance from pore. Penial 

 setae not ornamented. Hab. Uschuia, S. America. 



This species has the same colouration as M. diversicolor, and might be confounded 

 with it at first sight. But the incomplete prostomium of the present species serves 

 to differentiate them even without having recourse to the internal structure. It has 

 unusually large ovaries, which however occupy the normal position. The sperm-duct 

 opens on to a papilla, which projects into the interior of the muscular duct of the 

 spermiducal gland. 



(13) Microscolex corralensis (NEW SPECIES). 



Definition. Length, 40 mm.; diameter, 4 mm.; number of segments, 70. Setae paired. 

 Prostomium complete. Dorsal pores present. Clitellum, XIII-XVII. Male pores widely 

 separated. Gizzard in VI, VII. Sperm-sacs in XI. Testes in X (?). Spermalhecae in 

 IX, with oval tkverttculvm. Penial setae markedly ornamented with transverse rvlget. 

 Hal. - Corral, Valdivia. S. America. 



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