12 HIRUDO. 



12th of June. The orifice of the oviduct which, as in leeches, is near 

 the anterior extremity, was greatly dilated on the 14th. And through- 

 out the night of the 15th, a vast quantity of spawn was discharged. 



This consisted of transparent albuminous matter, wherein the ova 

 were imbedded, each containing a solid yellow globule, in a much larger 

 transparent sphere, from the dimensions of which the ova appeared 

 considerably apart from each other. Spawn, fig. 24 ; a portion enlarged, 

 fig. 25. 



The animal was now much reduced ; and, on the 20th of June, had 

 become greatly disfigured. Nevertheless a new mass of spawn was dis- 

 charged ; and the parent was evidently dead. 



The whole spawn subsequently disappeared. 



Pi ATE I. 



FIG. 22. Hirudo grossa at rest. 



23. Extended. 



24. Spawn. 



25. Portion of the same, enlarged. 



4. HIRUDO CAMPANULATA The Bell Leech. Plate I. figs. 26, 27. 



Two specimens of this animal occurred among a quantity of mis- 

 cellaneous marine collections, but whether they were young or adult, no 

 circumstances enabled me to judge. 



Length, when extended, thirteen Hues, body round, diameter about 

 half a line. The anterior extremity dilates as a very broad disc, some- 

 what like a flattened hand-ball ; the posterior extremity dilates in the 

 same manner ; sucker very large proportionally. Colour of the body 

 dark olive, finely speckled with yellow. Disc and sucker very pale. 



These animals were extremely restless. They perished in a fort- 

 night from accidental impurity of the water. 



PLATE I. 



FIG. 26. Hirudo campanulata. 

 27. The same enlarged. 



