ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 481 



Leech of the Angler.* — W. Harold Leigh-Sharpe gives a careful 

 description of CalliobdeUa, lophii, a leech found on the ventral surface of 

 the angler (Lophius piscatorius), where it was discovered in 1863 by 

 Hesse. It is markedly divided into a neck and a body. Each body 

 segment consists of six annuli. Along the side of the body are eleven 

 pairs of pulsating respiratory vesicles. The common terminal portion 

 of the ductus ejaculatorii opens into a large and wide bursa which can 

 be protruded, wherewith is formed a copulatory apparatus which is at 

 least as long as the breadth of the body in the same place, and has at 

 its end a peculiar muscular part. There is a pair of vesicuke seminales. 

 There are no eyes. Blackish-brown star-shaped pigment cells are 

 absent. 



These are all characters of the genus CalliobdeUa ; the species is 

 marked by the extreme size of the posterior sucker, which is more than 

 twice the maximum breadth of the body and four times the size of the 

 mouth sucker. The body is not bestrewn with yellow dots. Immedi- 

 ately 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. The eggs 

 are oval, those of other species are hemispherical. According to Hesse, 

 they adhered to the wall of the vessel in which the leeches were kept 

 by a gelatinous secretion ; they much resembled the cocoon of the silk- 

 worm, and their surface was covered with very crisp and curly yellow 

 " silk." 



The author seeks to distinguish between CalliobdeUa and Trache- 

 lobdeUa in which Blanchard described four non-respiratory vesicles on 

 the preclitellum, twelve pairs of respiratory vesicles, and three or six 

 annuli on the abdominal somite. In CalliobdeUa there are no vesicles 

 on the preclitellum, there are eleven pairs of respiratory vesicles, and 

 there are six annuli on the abdominal somite. 



It is argued that CalliobdeUa lophii is a perfectly stationary parasite, 

 never quitting its host. In support of this conclusion, reference is made 

 to the extreme size of the posterior sucker, the weak development of 

 the longitudinal muscular layer, the occurrence of four or five specimens 

 on the angler and on it alone, the careful movements of the animal. 

 There is only one caecum, and its lumen is partly obliterated. The 

 cascurn was empty, and there was very little food in the whole alimentary 

 tract, which suggests that the animal does not need to gorge itself. 



Hirudinea of Georgian Bay.t — C. G. S. Ryerson communicates 

 some notes on the Hirudinea of Georgian Bay, Lake Huron. Four 

 families are represented : Glossiphonida 1 . with five species of Glossiphonia 

 and five of Placobdella ; Hirudinida?, with Macrobdella decora and two 

 species of Hsemopis ; Erpobdellida?, with Erpodbdella punctata and 

 Xrphelopsis obscara ; and Ichthyobdellidre, with two species of Piscicola. 



* Parasitology, vii. (1914) pp. 204-18 (5 figs.). 



t Coutrib. Canadian Biol., Suppl. 47th Rep. Dept. Fisheries, Ottawa. 1915, 

 Fasc. ii., pp. 165-75. 



