DESCRIPTIONS OF GENERA AND SPECIES 513 



(5) Ocnerodrilus sonorae, Eisbn. 



O. sonorae, Eisen, loc. cit., p. 251. 



Definition. Clitellum, XIV-XFII. Outer setae of ventral pair of segment XVII wanting. 

 Septal glands in F-VIII, nearly equal in size, slightly diminishing from before backwards. 

 Spermiducal gland confined to two segments, the muscular part not narrower than the 

 glandular. Spermathecae without differentiated muscnlar duct. Ilab. — Sonora, Mexico; 

 in moist soil near irrigation canals. 



(6) Ocnerodrilus hendriei, Eisen. 

 O. Hendriei, Eisen, loc. cit., p. 353. 



Definition. Length, if inch by | line. Clitellum, XIII- XVIII . Ventral pair of setae oh 

 XVII wanting. Septal glands of V larger than VI; those of VII and VIII very small 

 and equisized. Spermiducal glands occupy about two segments. Spermathecae in IX very 

 small. Hah. — Saint Tomas, Guatemala; on the road after rain. 



(7) Ocnerodrilus limicola, Eisen. 

 O. limicola, Eisen, loc. cit., p. 354. 



Definition. Clitellum, XIII-XIX. Ventral setae of segment XVII present. Septal glands 

 of V slightly larger than the following pairs ; those of VIII the smallest. Two pairs 

 of spermiducal glands in XVII, XVIII, the former, as usual, connected with sperm- 

 duct. Spermathecae in IX very small. Hab. — Guatemala ; in mill pond. 

 It is not quite certain from Eisen's description whether the ventral setae of xvii 

 are or are not missing; in the description of the species they are said to be wanting 

 once (p. 1^^), and on the next page to be generally present ; on p. 375 they are 

 again said to be wanting, and on the ' Table of Species ' (facing p. 382) to be present. 



(8) Ocnerodrilus rosae, Eisen. 

 O. Bosae, Eisen, loc. cit., p. 358. 



Definition. Length, i inch by f line. Clitellum, XIII-XVIII. Ventral setae of XVII 

 wanting. Septal glands of V hardly larger than of VI. Intestine begins in XIII. 

 Spermiducal glands slender and long, the muscular part nearly half as long as glandular. 

 The sperm-ducts are ensheathed near to their opening with muscular fibres. The 



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