200 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D See. 



The above shows a slight variation, partly actual and partly 

 due, perhaps, to unequal stretching of the body-wall. 



Anterior to the male pores the distance between setse c 

 and d is somewhat greater. The arrangement may be given 

 as follows:^ 



d-c^20\ c-3 = 55; b—a^i2; a—a=/\^; a—b=i2; 3-c=55; 

 c—d= 20. 



As regards the size of the set£e, it is interesting to note that 

 while those posterior to the male pores are all of about the 

 same size, those between the male pores and the front part 

 of the body vary in such a way that the ventral set£e are 

 about twice as large as the lateral. The apices of these 

 setag are slightly ornamented with five to six rows of shallow 

 notches, resembling the undeveloped eyes of a potato. 



Gizzards. — The two gizzards are well developed and 

 situated in somites V and VI. 



Intestine. — The tubular intestine offers nothing character- 

 istic. It is straight and only slightly nipped by the septa. 

 The sacculated intestine commences in XIV. It is of char- 

 acteristic structure. The outer wall of this part of the 

 intestine in somites XIV to XXI is straight, but the inner 

 layer comprising the villi is much folded, being besides 

 very thick. This inner epithelial layer is thicker and more 

 folded than any other epithelial layer of the intestine, and 

 is probably of the nature of a typhlosole. In somite XX 

 the sacculated intestine assumes the usual shape, with thin 

 walls not folded. 



Generative Organs. — The testes are in somites X and XL 

 There are two pairs of large racemose sperm-sacs project- 

 ing from the anterior septum, in somites XI and XII. The 

 sperm-funnels are in X and XI. The ovaries in XIII. The 

 ovipores are separated. The spermathecae are very large, 

 each being furnished with a large forward pointing diver- 

 ticle, originating near the base of the main sac, the junction 

 of the two being very wide and the diverticle within a neck. 

 The spermatozoa are collected in small pockets in the wall 

 of the sac, in the same way as in Argilophilus, the pockets 

 being somewhat smaller than in that genus (Eisen 16). 



