78 BibJiojraphical JVotice. 



is but one nucleus at the end of each process, but I find in 

 the Actinotrocha of Phoronis architecta tliat there may be 

 two. (This conclusion is not drawn from bent nuclei, although 

 I admit that such exist.) 



It is, I think, a fairly well-established fact tliat the posterior 

 pit (fig. 2,, n.j).) and its wall become transformed into the 

 iiephridial canals of the Actinotrocha, and if we assume that 

 the pit is of ectodermal origin, which seems to be the case in 

 Phoronis architecta, we may say that tlie canals are of ecto- 

 dermal origin. There is still some doubt as to whether the 

 tubular processes or excretory cells arise from the blind ends 

 of the nephridial canals, or whether they represent mesoderm- 

 cells which have become applied to the wall in that region. 

 Ikeda describes such mesoderm-cells, but I have never seen 

 them in the larvae of Phoronis architecta. In fact, all tlie 

 observations that I have made lead me to l>elieve that the 

 excretory cells arise from the blind ends of the nephridial 

 canals. 



The nephridla which Masterman says exist in the preoral 

 lobe arc not present in eitlier of the Actinotrochce from 

 Beaufort Harbour, nor are there any nephridia (Masterman 

 now denies the existence of these) in the region of the perianal 

 ring. 



During metamorphosis, as Ikeda has describe.l, tlie excre- 

 tory cells and a large part of the nephridial canals are lost, 

 and the great changes which take place in the relation of the 

 diflerent parts causes their openings to be brought closer to 

 the anal region. I am not prepared to say, however, that 

 they become the nephridial pores of the adult. 



13IKLI()(iRAPHICAL XOTICE. 



Monograph of the Coccidte of the British Isles. By Hobert New- 

 stead, Curator of the Grosvenor Museum, Chester. Vol. I. 

 pp. xii, 220 ; pis. A-E, 1-34. Vol. IL i)p. viii, 270 ; pis. F, 

 35-75. Londou : printed for the Eay Society, lUOl & 1SJ03. 



SixcE the first publications of the Hay Society appeared in 184-I-, 

 the Society has published a long series of valuable monographs, 

 chiefly, but not exclusively, dealing with the Fauna of the British 

 Islands ; and the concluding volume of Mr. Newstead's great work 

 on the Coccidae has just appeared, under the management of Mr. John 

 Hopkinson, F.L.S., who succeeded to the post of Secretary nu the 

 death of Kev. Trot. Wiltshire last year. 



ThoCoccidie, or Scale-Insects. are extremely destructive in gardens, 



