FA EISEN, PRELIM. REPORT ON GEN. AND SPEC. OF TUBIFICIDAE. 
and heavy, and can easily be detected, but in others, as in 
C. spiralis, their structure is very fine and pellucid, and they 
may sometimes be easily overlooked. 
Only four species are as yet known, viz. 
A. The oviduet is double. The interior one is chitinous. 
'The lower end of the penis-sheath is suddenly increased 
in size and platelike. C. spiralis n. sp. 
B. The oviduct is single and not chitinous. 
a. The cephalic ganglion broader in front than behind. 
I . S S . . 
The exterior end of the penis-sheath is suddenly ex- 
yanded and platelike. = C. iqneus n. sp. 
1 I J I 
b. The cephalic ganglion is nearly broader behind than 
in front. The lower or exterior end of the penis- 
sheath is very gradually increasing in width and not 
suddenly expanded. C. corallinus n. sp. 
ce. The cephalic ganglion is broadest behind and well 
rounded. "The exterior end of the penis-sheath is sud- 
denly increased in width, funnelshaped but not plate- 
like. C. californicus n. sp. 
C. spiralis n. sp. 
RAS: 
The spiral muscles surrounding the copulative organs are 
finer than in any other species known, and may be easily 
overlooked. "The penis-sheath is long and narrow, and nearly 
perfectly straight. Its exterior end is suddenly increasing in 
width, but is not plate-like. The interior oviduct is of the 
same shape and size as the penis-sheath, only wider at both 
extremities. The exterior oviduct is sack-like at its lower end 
and somewhat resembling the same organ of Camptodrilus 
igneus. The receptacle is long, sack-like and bent at the 
middle. 'The segmental organs are not furnished with glo- 
bular cells, and their interior opening not surrounded by 
glandular agglomerations. The spines are slightly curved, 
and the aperture of the prong is larger in the posterior seg- 
ments than in the anterior ones. 
The body is about 25 m.m. long, by I m.m. wide and 
of a steel blue colour. When touched the animal coils itself 
up, and alcoholic specimens are accordingly never found 
extended. "The integument is tender. 
