FAUNA CANADEITSIS. 501 ' 



9. Gammarus, sp. 

 A. form miicli smaller than the preceding, of common occurrence in 

 shallow water at the ponds of the " Island." 



10. Crangonyx (.?), sp. 

 A small Araphipod, which may perhaps belong to this genus. 

 Hah. — -Kot uncomm.on in from ten to fifteen fathoms^ amongst 

 bunches of Cladophora upon a muddy bottom. 



11. Gypris (?) sp. 



A small Ostracode Crustacean, probably belonging to this genus, 

 "which occurred plentifully, along with the preceding, amongst Clado- 

 phora upon a muddy bottom and at a depth of from ten to fifteen 

 fathoms. 



12. Pontoporeia affinis, Lindstrom. 



Small Amphipods, varying in leiigth from one-tenth to one quarter 

 -of an inch, and of a uniform pale flesh coloui\ They appear to be- 

 .referable to the Swedish species. 



Hah.—Yerj plentiful on a bottom of sandy mud in depths of from 

 thirty to forty fathoms. None vfere found in depths less than this, 

 tliough they occur plentifully in Lake Superior in all dredgings from 

 the shallowest to the deepest. 



ARACHNIDA. 



13. Limnochares, sp, 



A fine species of this genus of Water Mites was extremely abun- 

 dant in shallow^ water and in the ponds at the " Island." 



14. HydracJina, sp. 



A small Water-Mite oceuri'ed abundantly in Toronto Bay in from 

 •one to two fathoms. 



INSECTA. 



15. C7iirono?nus or Goretlira, sp. 

 The larvse of a species of Dipteron belonging to one or other of 

 the above-mentioned nearly allied genera occurred abundantly in all 

 the dredgings in which a muddy bottom was found in depths of from 

 two to twenty fathoms, but more abundantly in the smaller dej)ths. 

 The colour varied in different examples from deep blood-red to pink 

 or greenish ; and their semi-transparency rendered them very 

 beautiful objects under the microscope. 

 4 



