OF CONCIIOLOQY. 165 



creep out of it into tlie open air to avoid a sensation whicli we 

 should call stifling or suffocation." 



This paper is concluded with a description of a new species 

 of Amphisj)hyra. 



A. expansa, Jeffreys, Shetland, 



and a monograph of the species StiUfer, including a descrip- 

 tion of the animal. 



Transactions of the Linnean Society of London. Vol. 24, part 3, 



1804. 



On a JSltfo Genm of Teredininse. BY E. PERCEVAL WRIGHT, 

 M. D. 



This species was obtained in Comer River, a branch of the 

 Ganges. The water is perfectly fresh, being seventy miles 

 from the sea, though at thirty miles further down it is brack- 

 ish at full tide. The species, it appears, though now first 

 described, is well known to Hindoo boatmen, who meet witii 

 it even higher up the Ganges. Boats infested by them are 

 suspended over a fire, which soon destroys them, and by 

 slightly charring the surface, prevents, for a time, a second 

 attack. 



The auricle is not developed on the valves of this species, 

 we are informed, but whether this proves a permanent, and, 

 therefore, a generic character, must be determined by future 

 researches. Only two specimens were examined, and I have 

 occasionally found the auricle absent in species in which it is 

 usually well developed. 



In the largest specimen, the valves are an inch in length, 

 and the pallets 7-8ths of an inch. Of the latter, "the body is 

 broad, slightly concave on its inner surface, which, in one 

 specimen, is worn somewhat flat ; the outer surface is convex 

 and roughly imbricated. A peculiar coredike body is seen 

 running through the expanded portion underneath the thick 

 scaledike stride. The stalk is cylindrical, curved, and tapers 

 to a fine, sharp point ; there is a slight muscular scar around 

 the junction of the body with the stalk." Dr. Wright has 

 named the genus Nausitora, and the species N. Dunhpiei. 



On the Structure and Homologies of the Renal Organ in the 

 Nudihranchiate Mollusca. BY ALBANY HANCOCK. 



An extended and valuable paper, illustrated bj six excellent 

 plates. 



