432 NATURAL HISTORY OF THE POLAR REGIONS. 



twelfth with four, and the remainder with six spines, dispersed 

 in rows and equidistant on each side the back. The colour 

 was dark brown, with a line of white spots along each side. 

 A caterpillar, found under a stone, in the middle of March, 

 perfectly hard frozen, showed symptoms of life in half an hour 

 after being brought into the cabin, and in less than an hour 

 was walking about the table. 



Laria Rossii. — The caterpillars of this moth were the sub- 

 ject of the following experiment. Thirty of them were put in 

 a box, and exposed to the winter temperature for three months ; 

 on bringing them into the cabin, every one of them returned to 

 life and walked about ; they were again exposed to an atmo- 

 sphere of forty degrees below zero, and instantly became re- 

 frozen : after a week, they were brought again into the cabin, 

 and twenty-three returned to life : these were again exposed, 

 refrozen, and, after being solid for another week, eleven of 

 them revived on being brought into the cabin ; a fourth time 

 they were frozen, and two only recovered ; of these two one 

 produced a moth, the other six flies. 



Culex capsius. — It appeared about the 10th of July, 15th 

 became extremely numerous, and 22d so troublesome as to 

 prevent the necessary duties of the ship. They were in per- 

 fect clouds over the marshes, and these larvae constitute the 

 principal food of the trout in the lakes. 



Acanthonotus cristatus. — This is a new and most singular 

 genus of Crustacea Amphipoda. It is nearly allied to Talitms 

 of Latreille, and was first discovered during Parry's second 

 voyage, near the island of Igloolik. In the course of the pre- 

 sent voyage a few specimens were taken at Felix Harbour. 

 We subjoin the generic character. Antennas of nearly equal 

 length, four-jointed ; the terminal joint consisting of very many 

 rings; the third joint of the superior antennas short; the four 

 anterior feet monodactyle, filiform, having in the first four the 

 terminal joint serrated ; rostrum produced, acute, incurved. 



Acanthosoma hystrix. — This is a still more singular animal 

 than the preceding, and is very distinct from any thing we have 

 seen. On each of the nine segments following the head are 

 seven spines, forming seven longitudinal rows; there are two 

 spines on the head, one on each side of the rostrum; on the 

 tenth segment are five spines, and on the following one three 

 only. 



