BY WILLIAM A. HASWELL. 427 



border concave and the postero-external, which is divided into 

 half a dozen lobes by shallow depressions, convex. Each testis 

 has its vas deferens (PL xxi., fig. 1, v.d.), which leaves its inner 

 border behind the middle of its length. The right vas deferens 

 (r.v.d.) runs across the middle line to join the left. The common 

 duct thus formed, a wide thin-walled tube, winds in a close spiral 

 from the free extremity to the base of the penis, where it opens 

 into a wide vesicula seminalis, from which the ejaculatory duct 

 passes through the penis to open into a median chamber, the 

 genital cloaca. Into the vesicula seminalis open also two sets of 

 ducts (gr.d.) of the granule glands, the granules from which 

 collect in masses in the interior of the base of the penis. The 

 penis (PL xx., p., and PI. xxi., figs. 1 and 3) is a chitinous body 

 situated a little to the left of the middle line, with its long axis 

 directed obliquely, the proximal end anterior and external, the 

 distal posterior and internal. It consists of a tubular or rather 

 funnel-like basal portion, and a distal portion composed of a 

 number of spines. The basal portion is very wide at the proximal 

 end, the greatest width being nearly equal to the length. The 

 spines are ten or twelve in number, some straight and dagger- 

 shaped, others curved and tapering. 



The female organs consist of a single ovary (PL xx. and PL xxi., 

 figs. 1 and 2, ov.), oviduct and uterus (ootype), vitelline glands, 

 vitelline ducts, and a receptaculum vitelli. The ovary is a 

 pear-shaped body situated to the right of the middle line. The 

 oviduct is given off from the narrower left end of the ovarj-; it is 

 almost immediately joined by the wide short duct of the recepta- 

 culum vitelli. The common duct thus formed varies greatly in 

 width in different specimens. In some it presents a sharp bend 

 or twist, and in the lumen of this part of its course a mass of 

 living sperms (fig. 2, sp.) was observed in sevei'al individuals. 

 Further back it dilates to form a chamber which is apparently 

 the ootype (oot.), and this opens by a wide vagina into the genital 

 cloaca. The receptaculum vitelli (r.v.) is a rounded chamber 

 situated somewhat to the right of the middle line. Into it, 



