314 ZOOLOGY 



tozoa. The tube is narrow anteriorly, then somewhat wider, 

 and finally it narrows posteriorly into a duct, and opens by it 



A. Smtigera rubra Uneata. After Buffon. 



B. Tergum and part of a second tergum of the same, enlarged to show the 



position of the stigmata, o, o. p, Hinder margin of tergum. 



into a circular canal which surrounds the rectum, and receives 

 the opening of two tubular vesiculae seminales. 



Ventrally this canal enlarges into a chamber which receives 

 the ducts of two pairs of accessory glands of considerable size ; 

 it opens to the exterior, on the ventral surface of the last 

 segment, immediately in front of the anus. The spermatozoa 

 are filiform. 



The ovary is a single tube, dorsal to the alimentary canal, 

 and reaching as far forward as the head, it is continuous with . 

 the oviduct; this divides into two branches, one of which 

 passes on each side of the rectum, and the two unite again in 

 a chamber which, like the corresponding structure in the male, 

 receives the secretion of two pairs of accessory glands. A pair 

 of hollow vesicles, the receptacula seminis, also open into this 

 median chamber. The latter opens to the exterior just in 

 front of the anus, the opening being provided with a pair of 

 minute jointed claws. 



The exotic species of Scolopendra may attain the length of 

 six inches, and their bite is extremely painful, and even dangerous. 

 Cryptops and Geophilus have no eyes : the latter possess a great 



