82 WILLIAM BLAXLAND BENHAM. 



vessel is doubled throughout the body, except at its passage 

 through the septa, but in one specimen it was a single tube 

 throughout. 



Urobenus brasiliensis, nov. gen. et sp. 



I have named this worm after my friend Dr. A. G. Bourne, 

 of the Presidency College, Madras, the name being formed by 

 transliteration. Its specific name refers to its habitat. It came, 

 together with a species of Titanus, from Pedza a9u, and was 

 given to Prof. Lankester by Prof. Edouard van Beneden of Liege. 

 External Characters. — The worm is 6 inches in length, 

 and about ^rd of an inch in breadth ; it consists of ninety-two 

 somites, which are of nearly equal size throughout the body. 

 The worm is cylindrical, and tapers gradually anteriorly, where 

 it ends in a well-marked though narrow prostomium (PI. 

 VIII, fig. 11) which is embedded in the buccal somite only 

 to a slight extent. The worm was soft and not much con- 

 tracted, so that the somites have not the annulated appearance 

 so frequently noticeable in Earthworms. 



The clitellum is fairly well developed and does not extend 

 completely around the body, in this respect resembling Lum- 

 bricus, Microchseta and others. The latero-ventral edge is 

 placed between the ventral and lateral rows of setse ; the cli- 

 tellum extends through somites xiv to xxv (PI. VIII, fig. 12). 

 The set 86 are arranged in four couples in each somite — a 

 ventral couple on each side, and a more lateral couple on each 

 side (figs. 12 and 20j ; this condition holds throughout the 

 body. The setae themselves have the ordinary shape of an 

 elongated f \ the free extremity, however, is slightly more 

 hooked than in Lumbricus; there is the usual thickening 

 about midway along the setae (fig 13, a). The setae from the 

 ventral series of the clitellum have their embedded portion more 

 distinctly curved than the ordinary setae (fig. 13, li). The length 

 of the setae is 65 mm. 



The nephridiopores are placed in the anterior region of 

 the somites in a line with the outermost setae of the lateral 

 couples (fig. 12, c). 



