216 
Calliobdella lopliii 
the maximum breadth of the body, and four times the size of the mouth 
sucker. The body is not bestrewn with yellow dots. Immediately 
behind the neck the body increases in breadth more rapidly than in 
C. nodulifera, so that the relative difference between the two parts is 
more marked, and the flattened condition of the abdominal part is thus 
the more strongly noticeable, a condition which is probably dependent 
on the weak development of the musculature of that part. Eggs oval. 
The unmistakable colouration characters may be of specific value. 
(This investigation was carried out at the South-Western Polytechnic Institute, 
Chelsea, London, S.W. I have to acknowledge the kind help of Mr J. T. Cunningham in 
checking the results; also of Mr Harold R. Southam for reproducing the figures from 
my rough sketches.) 
REFERENCES. 
Blanchaku (1894). Hirudinees de I’ltafie, Boll. Mus. Zool. Torino, ix. No. 192. 
Bourne (1884). Quart. .Journ. Micr. Sc. p. 419. 
JoHANNSON (1896). Die Ichthyohdelliden in Zool. Beichsmuseum in Stockholm. * 
- (1896). Bidrag till Kdnnedomen orn sveriges Ichthyobdellider. Upsala. 
Lbigh-Sharpe (1913). Calliobdella lophii. Journ. Mar. Biol. Assoc., x. No. 1. p. 81. 
Leuckart (1894). Parasiten des Menschen, i. 
Olsson (1876). Bidrag till Skandinaviens Heliniiitlifaiina. Vet. Akad. Handl., i. 
and ibid. ii. (1893). 
Quatrefages (1852). Ann. Sc. Nat. xviii. p. 322. 
Van Beneden and Hesse (1863). Recherches sur Ics Bdellodes ou Hirudinees. 
Whitman (1885). External Morphology of the Leech. Proc. American Acad. xii. 
( 20 ). 
— 11889). 
Some new facts about the Hirudinea. 
Journal of Morphology (2), 
