W. H. Leigii-Sharpp: 
between these two segments, or rather towards the anterior border of 
the second. The third segment is intermediate in size between the 
first and second, and is divided into six minute annuli. 
The $ genital aperture is on the first annulus of the third segment. 
I do not find any lateral tubercles on the neck whether respiratory 
or otherwise. 
(j8) Abdomen. A. Testis Eegion . . .. 6 segments. 
Each of the first six segments of the abdomen is completely divided 
into six annuli. The first three only, of these six segments, bear lateral 
respiratory vesicles, bordering the first two annuli of these segments. 
There is one pair of testes to each of these segments. Each segment 
(not annulus) is divided from the next by a deep furrow which shows 
as a marked line when treated and viewed as above. 
B. Caecum Kegion .. .. .. .. 6 segments. 
These six segments are small, and each is only equal in size to an 
annulus of the preceding segments of the testis region. Though the 
caeca actually start about the boundary between segments 4 and 5 of 
the testis region, and only extend as far as the boundary of the 3rd and 
4th segments of this region, yet no testes are found here. 
C. Anal Region .. .. .. .. .. 3 segments. 
The anus opens dorsally between the ultimate and penultimate 
segments. Ventrally, in the middle of the ultimate segment there is 
a raised glandular papilla, of possible olfactory function, shown on an 
enlarged scale in Fig. 3. 
D. Posterior sucker .. .. .. .. (?)7 segments. 
Total for the whole body 37 segments. (See Fig. 2.) 
Nervous system. There occurs the usual ventral nerve cord with 
ganglia along the chain. The foregoing conclusions concerning segmen¬ 
tation are based on a consideration of these ganglia in agreement with 
the views of Leuckart and Whitman given in my previous paper {q.v.). 
Respiration. Respiration is carried on by means of hemispherical 
vesicles protruding from the sides of the abdominal portion of the body. 
These vesicles rise and fall. They are reduced in number from the 
condition prevailing in Calliobdella, Piscicola, Cystibranchus, Branched 
lion, and other genera, there being only three pairs, situated on either 
side of the first three segments of the abdomen bordering the first two 
annuli of each segment. 
