150 CALIFORNIA ACADEMY OF SCIENCES, [Proc. 3D Ser. 



This little species of Notiodi-ilus is well characterized 

 by the position of the diverticles of the intestine in somites 

 VII, VIII and IX. Nearly all other species of this genus 

 have the diverticles much farther back, generally posterior 

 to XIII. N. cristalifer is readily distinguished by the 

 form of its spermatheca from N. tamajusi^ also from Guate- 

 mala, the only other species so far known which has the 

 intestinal diverticles in the same somites. N. tamajusi has 

 the penial setse ornamented at apex. N. Whitmani has no 

 intestinal diverticles. 



Detailed Description. 



Dorsal ^ores present; the most anterior one IX/X (?). 



Glands. — The suprapharyngeal glands are in six lobes, 

 the most anterior one being very minute. There is no 

 trace of any septal glands. 



Calciferous Dive^'ticles. — The calciferous diverticles of 

 the intestine occupy the ventral or latero-ventral part of the 

 intestine in somites VII to IX, and constitute merely thick- 

 ened folds or swellings of the intestine. They possess, 

 however, the same internal structure as diverticles of other 

 species, that is, their interior cavity is divided by numerous, 

 more or less parallel, folds of the inner epithelium. In a 

 vertical section of the intestine it is. seen that these folds are 

 confined to the ventral part, gradually diminishing laterally, 

 and entirely absent on the dorsal side, where the walls of 

 the intestine are characterized by large blood-sinuses. 



The spermatheccB in VIII and IX are medium sized, 

 slender sacs, each with a small tubular diverticle pointing 

 forwards, but confined to the somite of the spermatheca. 



The sferm-sacs in IX are large, filling the whole somite. 

 They are surrounded by a peritoneal membrane but are 

 without trabecula. The racemose sperm-sacs are in XII; 

 they are very small and confined to the lateral and ventral 

 sides of the coelom. 



The glandular part of the prostate is large and bent 

 zigzag, but is confined to the somite into which it opens. 

 There are two distinct layers of cells. 



