556 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
white or cream color, a few were lemon-yellow, and a few orange- 
yellow. The specimen from the chub was a male 6 mm. in length and 
of a rusty yellow color. In a few cases external pores, with elevated 
thickened borders, were observed, similar to what I have recorded in 
BE. agilis (Report of Commissioner of Fish and Fisheries, 1886, p. 490). 
One of these is shown in Fig. 40. The bodies of the alcoholic speci- 
mens are arcuate; the proboscis is usually inclined nearly at right 
angles to the body; the terminal aperture of the female is lateral near 
the posterior end. The lemnisci are proportionally longer in the males 
than in the females. The length is not well shown in Fig. 38, which 
was sketched from a specimen in glycerin, in which the lemnisci did 
not show plainly. They frequently extend far beyond the first testis, 
and are, moreover, often more or less folded. The testes are large, 
oblong, and approximate. The vas deferens is large; the prostatic sacs 
appear to be represented by a single elongated gland lying parallel 
with the vas deferens; the ejaculatory duct and bursa are both rela- 
tively large. 
The ovarian masses are ellipsoidal. The dimensions of a typical mass 
were, length .14 mm., other diameters about .07 mm. The fusiform - 
embryos were .035 mm. in length, and .015 mm. in breadth. ‘The outer 
cells of the ovarian masses are the largest and are nucleated. 
The body wall near the anterior end is thin, as shown in Fig. 36. 
Towards the median and posterior region the subeuticular fibrous layer 
thickens greatly and contains the relatively large branching vessels of 
the water-vascular system. Some of the latter may be seen in optical 
section in Fig. 38. 
The following measurements were obtained fr om typical aleoholie 
specimens: 
Measurements. Male. | Female. 
a eS EE a eee IE a) SE Oe ae Gee ates. 
| mm. mm. 
JRE SAAR Aasbris adaqo dbp sseone cad sas sabsecaae 6. 00 10. 00 
Length of proboscis - eter wee 0. 25 0.15 
. Diameter of proboscis smi 0. 20 0.15 
Length of proboscis sheath... & 0. 50 0. 40 
Length of lemnisci -...- Becme ate, eli) 1.50 
Length of largest hooks on n proboscis eee ae Soe! § LOLOT#** |e oat eee eee 
