[21] OLIGOCH^TOLOGICAL EESEAECHES. 899 



the exterior oviduct, the other to the interior surface of the body wall, 

 near to the genital porus. In other respects this genus resembles 

 Limnodrilus. Generally it may be said that the copulative organs of 

 this genus are comparatively longer and narrower than those of any 

 other genus of the family. 



The spines are only of one kind, viz, forked spines. 



Camptodrilus is well distinct from all other genera; from most of 

 them by having only forked spines, and from all of them, especially 

 from ' its nearest allied Limnodrilus, in having spiral muscles wound 

 round the copulative organs. 



Only four species as yet known. 



A. The oviduct is double; the interior one chitinous ; the lower end of the penis 

 sheath suddenly increasing in size, deflected and plate-like. 



C. SPIRALIS. 

 B. The oviduct is single, not chitinous. 

 a. The anterior margin of the cephalic ganglion is broader than the posterior 

 one. The exterior end of the penis sheath is suddenly expanded and 

 plate-like. 



C. IGNEUS. 

 ]}. The cephalic ganglion is nearly square, broader behind than in front. The 

 exterior end of the penis sheath is very gradually increasing in width, 

 and not suddenly expanded nor plate-like. 



C. CORALLLNUS. 



0. The posterior margin of the cephalic ganglion is the broadest, and well 

 rounded. The exterior end of the penis sheath is suddenly increased in 

 width, funnel-shaped, but not plate-like. 



C. CALIFOROTCUS. 



Camptodrilus spiralis n. sp. 



(PI. XVII, Fig. 15.) 



Generative systejyi.— The spiral muscles surrounding the copulative 

 organs are finer than those of any other species known, and may some- 

 times be easily overlooked. The penis sheath is long and narrow, and 

 nearly perfectly straight. Its exterior end is suddenly increasing in 

 size, deflected, but not plate-like (Fig. 15, a). The oviduct is double. 

 The interior one is of the same shape and general size as the penis 

 sheath, only wider in both extremities. The exterior oviduct is sack- 

 like at its lower end, and somewhat resembling the same organ of Camp- 

 todrilus igneus. The receptacle is long, sack-like, and bent at the middle. 



The segmental organs are not furnished with globular cells, and their 

 interior apertures are not surrounded by glandular agglomerations 



(Fig. 15, ^). . 



The spines are slightly curved, and the angle of the prongs is larger 

 in spines from the posterior segments than in those from the anterior 

 ones (Figs. 15 h and c). 



The body is about ^S"""^ long by I™'" wide, and of a steel-blue color. 

 When touched the animal coils itself into a spiral, and accordingly al- 

 coholic specimens are never found extended. The integument is tender. 



