78 lu'iih'oijniphioil Solice. 



is but one nucleu.s at the end of each process, but I tiud in 

 the Actinotrocha of Phoronis architect'i that 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 that the posterior* 

 ])it (tig. '1, n.p.) 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 the canals are of ecto- 

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

 tubnlar j)roces3es or excretory cells arise from the blind ends 

 of the ne])hridial canals, or wiiether 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 larvaj of Ptioronis architecta. In fact, all the 

 observations that I have made lead me to believe that the 

 excretory cells arise from the blind ends of the nephridial 

 canals. 



The nephridia which Masterman says exist in the preoral 

 lobe are not present in either 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 1, the excre- 

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

 and the great changes which take j)lace in the relation of the 

 difterent parts causes their openings to be brought closer to 

 the anal region. 1 am not prepared to say, however, that 

 they become the nephridial pores of the adult. 



BIELIOGKAPHICAL XOTICE. 



MonorjrapJi of the Coccida) of the British Isles. By IIobert New- 

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

 pp. xii, 2-20 ; i)ls. A-E, 1-31. Vol. II. j)p. viii, 270 ; pis. F, 

 ;j5-75. London : printed for the Kay Society, 1901 & 1U0I3. 



SixcE the first publications of the Kay Society appeared in 1844, 

 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. Xewstead'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 on the 

 death of Kev. Prof. "Wiltshire last year. 



TheCoccidie, or Scale-Insects, are extremely destructive in gardens, 





