PAUNA CANADENSIS. 499 



tw"enty fathoms tliey became mucli diminislied in numbers, and they 



did not present themselves at all wherever the bottom was of a 



sandy nature. 



6, Smnuris^ sp. 



Worm more robust, shorter, and broader than the preceding. 

 Length from one half to three quarters of an inch ; width behind the 

 head about one twentieth of an inch. Body slightly attenuated 

 posteriorly. Setse in four fascicles on each segment'; each fascicle of 

 six or eight setse arranged in a fan ; the setae hooked and foi'ked at 

 their tips. Cephalic lobe broad and sub-conical. Intestine not 

 markedly moniliform. 



I entertain little doubt but that this form is a new species ; but 

 from the cause already mentioned its state of preservation was so bad 

 as to preclude any minute examination of its peculiarities. I have, 

 therefore, not ventured to assign to it a sjiecific name. 



Hah. — Not uncommon on the same bottom and at the same depths 



as the preceding. 



7. Lumiriculus, sp. 



A fine Oligochsetous Annelide, of a i-ed colour, and about two 

 inches iri length. Body distinctly annulated. Head conical. Four 

 rows of straight spine-like setse, arranged in pairs. 



This form is very possibly new, but the absence of proper works of 

 reference renders it unsafe to give it a specific title. It is somewhat 

 related to Lumhricus lacustris, Verrill, from Lake Superior, but the 

 setse are sti-aight and not curved. 



Hah. — A single individual was dredged in three fathoms in Toronto 

 Bay, on a sandy bottom. 



CRUSTACEA. 



The Crustaceans which were obtained, thou.gh few in number and 

 of small size, present some points of sjDecial interest. Owing, how- 

 ever, to want of proper works of refei-ence, I am compelled to leave 

 the Crustacea and Arachnida at present undescribed. 



The most interesting form of the Crustama is a little Amphipod 

 which is probably identical with Pontoporeia affinis, Lindstrom. The 

 importance attaching to this form arises from the fact that it belongs 

 to a genus which is otherwise marine, and that it is found in collections 

 of fresh water as far removed from one another as Lake Superior on 

 the one hand, and Lakes Wetter and Wener in Sweden on the other 

 hand. In these last mentioned localities it is associated with Crusta-- 



