123] 0LIG0CHJ5T0L0GICAL RESEARCHES. 901 



|at its lower end, which is sack-like and extending beyond the same. 

 The cell nuclei in the same are not plainly visible. The ovaries are 

 short, bent in a right angle, in which latter the ova are developed (Fig. 

 14: g). The receptacle is short, wide, and sack-like, and the stem which 

 supports it is much smaller than in any other species. 



I The segmental organs in front of the cingulum are all furnished with 

 globular cells, but those in the segments behind the same have no globu- 

 lar cells. 1^0 glandular agglomerations round the interior aperture of 

 the organ. 

 The color of the body is yellowish red, with a light or not colored band 



', between every segment, giving the worm somewhat the appearance of 



! a string of red corals. The last posterior segment is five or six times 

 longer than the segment preceding the same. The length of the body 

 is variable, the general size being from 25"™ to SO'^'", but sometimes it 



I reaches from. 60"^™ to 70™"", with a width of from I™'" to 1^"". The in, 



I tegument is tough, giving some tenacity to the body. 



Habitat— Galiformsi, Fresno County, in ponds, or even in the running 

 waters of King's Eiver, Dry Creek, &c., always near the lev.el of the 



I prairie. 



I CAMPTODRILUS CALIFORNICUS, n. Sp. 



(PI. XVIII, Fig. 16.) 



Nervous system.— The cephalic ganglion is nearly square, posteriorly 

 \ well rounded, with a shallow emargination. 



I Generative system.— The copulative organs are all strongly built, and 

 I the spiral muscles heavier than in any other species of the genus. The 

 ' penis sheath is at its lower end suddenly increased in size, deflected, 

 but not plate-like. The oviduct is single, surrounds the penis sheath 

 I tightly ; its lower end is, however, more sack-like, resembling in this re- 

 spect the corresponding part of G. corallinus. 

 The segmental organs are not furnished with globular cells. 

 The body is of about the size, color, and tenacity as that of G. igneus. 

 The tail is distinctly segmented, and the last segment not longer than 

 the preceding one. 



HaUtat.—Califorma, San Francisco, Oakland, Lagunitas, Eussian 

 Eiver, &c., in ponds or stagnant water, only seldom in the streams them- 

 selves. 



As the species of this genus are somewhat difficult to distinguish the 

 one from the other, the following comparison of their principal charac- 

 teristics may prove useful. s 



G. spiralis has a double oviduct. Its penis sheath resembles that of 

 G. igneus, but is comparatively shorter. The copulative organs have also 

 some resemblance with those of i. alpestris, but this species has no spiral 

 muscles. 



G. igneus has a single oviduct, and is further distinguished by the 

 plate-like deflection or enlargement of the lower end of the penis sheath, 

 above which it is suddenly decreased in size. 



