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CALLIOBDELLA LOP II11. 
By W. HAROLD LEIGH-SHARPE, B.Sc., A.C.P. 
(With 5 Text-figures.) 
Habitat. This marine leech, a member of the Rhyncobdellida, or 
jawless leeches, is parasitic on the angler, Lojjhius jiiscatorius, and,-in 
my experience, attaches itself to the skin of the fish on the ventro¬ 
lateral surface indiscriminately ; it is not found near the vent, as is 
usually the case with Pontobdella, which occurs frequently attached 
near the cloaca of the skate. 
Record. Calliobdella lo-phii was taken by Hesse at Brest in 1863, 
by Lbnnberg and Jagerskiold near Bergen in 1889, and by myself at 
Plymouth in 1913. It occurs in the Mediterranean (Blanchard), and 
on the coast of Norway (Johannson). In 1913 I published an account 
of my capture, and a historical survey, together with a description of 
the external characters only. Only such of the external characters as 
it is necessary to mention therefore will be repeated here. 
Body. The leech is cylindrical, more or less spindle-shaped, 
broadest about the middle of the body. The animal is divided into 
two distinct regions, a neck region which is bare, and a body (in a 
restricted sense), the latter carrying laterally rounded vesicles described 
below. The body is elongated, slightly convex above, flattened below. 
Blanchard (1894) suggests it is flattened when young and rounded 
when old. The length is 5-7 cm. The colour is greenish-brown, with 
ventral rose-pink markings and an orange band, with other pigment 
characteristics, as described in my previous paper (1913). 
Suckers. As is usual with leeches there are two suckers, one at 
either extremity of the animal. The anterior sucker surrounds the 
mouth, and the posterior sucker is characterised by its extreme size, 
being more than twice the maximum breadth of the body, and four 
