556 OLIGOCHAETA 



EisEN in his species; this latter fact leads me to doubt the justice of placing this 

 species near to K. spegazzinii, or even perhaps in the same genus ; but until further 

 details are forthcoming it is useless to speculate as to its position in the system. 



(2) Kerria halopliila, Beddaed. 

 K. halophila, Beddaed, P. Z. S., 1892, p. SS5. 



Definition. Length, 25-50 mm. ; breadth, i mm. Clitelhim, XIV— XIX. Spermiducal gland- 

 pores behind or in front of the ventral setae of segments XVII and XIX ; the sperm- 

 duct-pores are just to the outside of the same setae of segment XVIII. Gizzard in 

 VII. Septa separating segments V/IX thickened. The nephridia of the posterior 

 segments are invested hy a thick peritoneal coating. Hah. — Upper reaches of Filcomaijo 

 river, in very saline water. 



(3) Kerria macdonaldi, Eisen. 



K. McDonaldi, EiSEN, Proc. Calif. Acad. (2), iii, 1892, p. 294. 



Definition. Length, ' one inch hy one line ' in diameter. Clitellum, XIV— XX. Male pores 



just to outside of outer seta of ventral pair. First septum divides segments IV/V ; 



next four are thickened. No gizzard; intestine hegins in XII. Septal glands in 



V-VIII. Spermathecae in VIII, IX, with trifid diverticulum,, opening hy outer setae. 



Hah. — Near San Jose del Cabo, California. 



This species is dealt with in a very complete fashion by Eisen ; his paper upon 



this and the following species being fully illijptrated. Its principal difference from 



K. halophila is, in the fact, that there are two pairs of spermathecae with diverticula ; 



of these, however, Eisen states that they are sometimes absent and occasionally 



reduced to a single lobe ; he mentions, as a noteworthy point, that the sperm was 



always found in the pouch itself and not in the diverticula — a circumstance which 



does not fall in with what has been observed in other worms whose spermathecae 



possess diverticula. Close to the opening of the spermiducal pores, are a bundle of 



delicate leaf-like processes of the integument. There are two pairs of sperm-sacs 



situated in segments x, xi ; in one individual anqther in xii was to be seen. Though 



this species agrees with the last in the fact that it has only a single pair of funnels, 



one individual had two pairs. The nephridia appear to commence in segment iv; 



those anterior to segment ix are smaller ; those of ix larger ; those of the two 



following segments again small ; the posterior glands are large and closely invested 



with large peritoneal cells. The setae of this species are figured and described as 



