DESCRIPTIONS OF GENERA AND SPECIES 557 



possessing a few minute pit-like excavations at the anterior end. The vascular 

 system, as in Ocnerodrilus, is characterized by the possession of two pairs of 

 contractile hearts in x, xi. 



(4) Kerria zonalis, EISEN. 



K. zonalis, ElSEN, loc. cit., p. 311. 



Definition. Outer setae of segments XVII, XIX wanting. Four pairs of spermiducal glands. 

 One pair of spermathecae in IX with diverticula. Gizzard absent ; intestine begin* in XII. 

 Hab. Near San Jose del Cabo, California. 



Of this species, EISEN had only a single incomplete specimen ; his data, therefore, 

 are necessarily deficient. The most remarkable feature about the anatomy of the 

 worm is, of course, the presence of a pair of spermiducal glands to each of the 

 four pores on the two segments xvii, xix. It is a character which not only 

 serves to distinguish the species from its congeners, but is unique in the Oligochaeta. 

 Both in this species and in the last the genital setae are stated to be smaller than 

 the normal setae of the body, but they show no other differences. 



Genus DEINODRILUS, BEDDARD. 



DEFINITION. Setae, 12 per segment. Clitellum, XIV-XVI, complete. Dorsal vessel 

 double. Calciferous glands absent. Nephridia diffuse. No penial setae. 



I formerly regarded this genus as a type of a family distinct from the Acantho- 

 drilidae (48). I am now, however, inclined to agree with BENHAM (1), and to place 

 it in the family Acanthodrilidae, of which it is clearly a perfectly well-marked genus. 

 Apart from the characters given in the above definition of the genus Deinodrilus can 

 be distinguished from any other genus of the Acanthodrilidae by the existence of 

 a ' pericardium,' to which I have already referred (p. a 8). 



Deinodrilus benhami, BEDDARD. 

 D. Benhami, BEDDARD, Q. J. M. S., vol. xxix, 1889, p. 105. 



Definition. Length, about j 25 mm. ProstomiiiM not, dividing buccal lobe. Clitellum, 

 XIV XVI t complete. Male pores connected by groove which passes to outside of ventral 

 setae. Septa separating segments VIII/XIII thickened. Gizzard in VI, VII ; intestine 

 with a well-developed typ/ilosole. Last pair of hearts in XIIF. Sperm-sacs in XI, XII. 

 Spermathecae with three direrticula. Hab. Neiv Zealand. 



