BY N. A. COBB. 769 



rather conspicuous ampulla, situated just in front of the nerve-ring. 

 Here the excretions find exit through the porus, which is connected 

 with the ampulla by a very short chitinous tube. The ventral 

 gland and its duct are shown black in the illustration. The lateral 

 fields are very inconspicuous, at least in specimens prepared in 

 balsam. Concerning the number of caudal glands I am uncertain. 

 Near the anus, sometimes in front of it (males) and sometimes 

 behind it (females), occurs a unicellular caudal gland of large 

 dimensions, characterised by staining strongly in carmine. I 

 believe there are other caudal glands (probably two), but am 

 unable to give details either as to position or structure. The 

 ovaries extend one-half to two-thirds the way back to the incon- 

 spicuous vulva, and are nearly as wide at their blind extremities 

 as elsewhere. The eggs are a trifle longer than the body is wide, 

 and one-half as wide as long. It is rare, according to my obser- 

 vations, to find more than one egg in the uteri, the two ovaries 

 apparently maturing the eggs alternately. (See the left-hand 

 figure in illustration 1.) 



■¥^ "'•1 "l-i " 2-^ — %i ^'^ ™™' The tail of the male closely resembles 

 that of the female. The uniformly arcuate spicula are twice as 

 long as the anal diameter, and when in action are guided by two 

 enveloping accessory pieces nearly half as long. A casual glance 

 at the spicula would leave the impression that they were of nearly 

 uniform size throughout, but careful study shows the proximal 

 halves to be enlarged. The single small ventral accessory organ 

 is placed in front of the anus at a distance one and one-third 

 times greater than the length of the spicula. (Consult the lower 

 right-hand figure in illustration 1.) 



The details of the male generative apparatus are set forth in the 

 illustrations on the following page. Both testicles extend forward, 

 only the blind extremity of the smaller posterior testicle being 

 reflexed. Each empties by means of a narrow duct (necessarily 

 much longer for the anterior one than for the posterior) into the 

 vas deferens. This latter is connected with the exterior by means 

 of a long and slender ductus ejaculatorius, composed of two rows 

 52 



