94 Queries and Answers. 



belongs. Oh clear nights he appeared, from the modu- 

 lation of the cry, to be at some height in the air. I 

 have no doubt some of your readers will confirm me in 

 my statement, and I am sure that the cry of this noc- 

 turnal visiter is too frequent in Suffolk to have escaped 

 observation. Is it the night heron (^4'rdea iVycticorax Linn., 

 A T ycticorax europa? v us Stephens) ? I heard it the other night 

 in Clapton. Does the night heron ever approach so near to 

 the metropolis ? Does the night heron delight in rainy wea- 

 ther ? Perhaps some of your readers can answer my inter- 

 rogations ; if they can, I shall be obliged to them for doing so. 

 I am, Sir, yours, &c. — H. T. Clarice. Clapton Square, May 2. 

 1832. 



Mr. Dovaston's notice of the night calls of the bittern, 

 p. 9., may be read in connection with this article ; not that I 

 would represent it as answering Mr. Clarke's query. — J. IX 



What is the Name of that Insect so freque?itly found encysted 

 by the side of the Head of the Prawn [Cancer Squilla L.) ? — 

 When at the sea-side, a few weeks since, we discovered, in 

 several of the prawns at breakfast, an insect, having some 

 resemblance to the woodlouse (Oniscus), in a cyst or bag by 

 the prawn's head. Fishes are at times greatly tormented with 

 insects ; and I have frequently, while fishing in the Thames, 

 caught gudgeon (Cyprinus GobiojL.) with a small flat-shaped 

 insect adhering to the side of the fish's mouth. — O. Clapton, 

 Aug. SO. 1832. 



The animal referred to by our correspondent, as found 

 encysted by the side of the head of the prawn, is the Z?6pyrus 

 &quillarum of Latreille. A notice of this species, by the late 

 Colonel Montagu, will be found in the Transactions of the 

 Linnean Society, vol. ix. p. 104., under the name of Oniscus 

 /Squillarum ; a short description also occurs in the last edition 

 of Pennant's British Zoology, vol. iv. p. 41. A figure of 

 jBopyrus Squillarum will be found in the excellent work of 

 M. Desmarest on the Crustacea. 



In the paper by Col. Montagu, before mentioned, a second 

 parasite (lone thoracicus Lat.), also infesting another species 

 of Crustacea (Callianassa subterranea Leach), is described, 

 with figures of both ; and a description of this parasite will 

 also be found on the same page of Pennant's work with that 

 of the Z?6pyrus. 



The small flat- shaped animal, seen occasionally adhering 

 to the soft parts of the surface of some of our freshwater 

 fishes is probably the A'rgulus foliaceus of Jurine, fils, of 

 which a description and figure will be found in the work of 

 M. Desmarest before quoted. (See p. 329. and pi. 50. fig. 1.) 

 The small animals infesting fishes are, however, more nume- 



