454 Miscellaneous. 



allel with those of Audubon in his * Synopsis.' I would propose as 

 an appropriate English name for this bird, the ** Long-tailed Black- 

 cap Titmouse." — Ibid. 



Red Colour of the Blood in Planorbis imbricatus, 



^. By M. DE QUATREFAGES, 



■ In examining by transmitted light Planorbis imbricatus, M. de 

 Quatrefages has perceived that this little moUusk, very common in 

 the soft water of the environs of Paris, has red-coloured blood. With 

 a weak magnifying power the liquid is seen to fill the cavities of the 

 pericardium and of the ventricle, and at moments to colour the ge- 

 neral cavity of the whole body on its lower surface. M. de Quatre- 

 fages has not seen any distinct globules in this liquid. Other speci- 

 mens, of a very small size, have colourless blood. M. de Quatrefages 

 presumes that these are the young of the P. imbricatus, the blood of 

 which acquires its characteristic tint only with age ; and he remarks 

 that if this conjecture is verified by observations which he intends to 

 continue, it would be exactly the same with these moUusks as with 

 ! the Annelides.'—Institut, Jan. 7, 1846. 



INDIAN SPECIES OF PAPILIO. 



To the Editors of the Annals of Natural History, 



Brixton, May 18th, 1846. 



Gentlemen, — Having been informed by Mr. Westwood that he 

 had written to Dr. Erichson on the subject of my comments upon 

 his Report on Entomology for 1842, and having been led to expect 

 that an early answer would be received, I delayed replying to Mr, 

 Westwood's communication in your January number. 



From what I have lately heard from Mr. Westwood, it does not 

 appear that he has now much expectation of a speedy reply, in fact 

 that it may be deferred to the Greek calends, or may perchance have 

 fallen on the road, 



Lassaque facta via, lassaque facta mari ; 

 and there lies waiting strength to continue its journey. 



This being the case, I must decline to delay any longer a re-asser- 

 tion of my belief that Dr. Erichson is in nowise blam,eable for the 

 errors I have pointed out in his Report, but was misled by erroiieous 

 h formation from England ; at the same time asserting the correct- 

 ness of the Ray Society's version of the passages in question, the 

 word Mr. Westwood would translate diiFerently being commonly 

 used by German entomologists to signify absolute specific identity, 

 — a fact which I am surprised Mr. Westwood could overlook. 



It is equally surprising to me that Mr. Westwood can assert that 

 so acute an entomologist as Dr. Erichson could imagine, from my 

 description of P. Xenocles, that it was identical with P, Pollux. I 

 think it quite as probable for him to suppose that a minute descrip- 

 tion of a kittiwake compared with the short Linnaean description of 

 the jackdaw proved their specific identity. 



I must also beg leave to deny Mr. Westwood's right to assume, 

 from the conversation he refers to, that my remarks were intended 



