JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE XI, 
Illustrating Henry Giglioli’s paper on the genus Callidina 
(Ehren.), with a Description and Anatomy of a New 
Species. 
The letters have the same signification : 
a, Trochal dise; 4, mouth; c¢, pharynx; d, mastax; e, esophagus; /, sto- 
mach ; g, intestine ; A, cloaca; z, anus; j, ovary; &, cellular mass sur- 
rounding the intestine; J/, contractile vesicle; m, water-vessels; 
nm, calcar; 0, ganglion (?); p, vacuolar thickenings; Q, head; &, body; 
S, tail; ¢, claspers; w, suckers. 
Fig. 
1.—Dorsal aspect of C. parasitica, with the trochal disc retracted. 
2.—Ventral aspect of C. parasitica, the trochal disc being expanded, 
3.—Alimentary canal of C. parasitica, greatly magnified. 
4.—C. parasitica attached by its suckers to part of an appendage of G. 
pulex ; it is retracted, and shows the corrugations of the integu- 
ment. 
5.—Calcar, much enlarged. 
6.—Ovum, recently deposited. 
7.—Camera-lucida drawing of two ova attached to part of a thoracic 
appendage of G. pulex ; they are magnified 210 diameters. 
§.—Caudal appendages (from a camera-lucida drawing), highly magnified. 
9.—Portion of ovary, greatly magnified, showing the germinal vesicles and 
spots. 
