Natural History of East FtnmarJc. 359 



may be distinguished from Buyulopsis are that the 

 form of growth in the latter is that of a little bush and 

 the zoarium is charged with carbonate of lime ; in 

 B. elonyata the growth is from a single stem giving 

 forth branches for the most part dichotomously, and 

 the zoarium is altogetiicr chitinous, as is usual in the 

 genus Bugula. These last differences were regarded by 

 me as simply varietal, and it was not until my attention 

 was directed to his species by Herr Nordgaard that I 

 discovered on some of my specimens a few of the 

 peculiar avicularia. It is probable, as suggested to me 

 by Herr Nordgaard, that other records of Buyulopsis 

 Peachii from Arctic localities may likewise be referable 

 to his species ; and I find that I have this form from 

 as far south as the Bergen and Hardanger Fiords. In 

 the adjoining woodcut^ fig. 1 represents the zooecia, 

 ocecia, and avicularium of Biifjula elongata, fig. 2 the 

 avicularium more magnified, fig. 3 radii of the ooecium 

 highly magnified, while fig. 4 illustrates the corre- 

 sponding radii in the ooecium of Bugulopsis Peachii 

 for comparison. 



Vol. xi. pp. 580 & 581. — For Kinekoskias read Kinetoskias. 



Vol. xi. p. 595. — '' Genus Oochilina, gen. no v. Type Oochilina 

 {Membranipora) crassimarginata, Hincks.^^ Mr. Waters 

 kindly called my attention to the fact that M. F. Canu 

 bad in 1900 instituted a subgenus Crassimarginitella, 

 with the same type, Membranipora crassimarginata, 

 Hincks (Canu, " Revision des Bryozoaires du Cretace 

 figures par d'Orbigny,'' Bull. Soc. Geol. France, ser. 3, 

 vol. xxviii. 1900, p. 369). This paper was not in my 

 library when I wrote, and the Zool. Record, which I 

 had consulted, contained no reference to the genus. 



In this same paper of Canu the following genera 

 may be mentioned as having reference to wdiat I have 

 written : — 



" Rhynchotella (subgen.). Type Membranipora rhyn- 

 cAo/a, Busk," Tp. 367, and " Rhamphonotus, Gray {sic). 

 Type Membranipora Flemingii, Busk/' p. 417, should 

 read Rhamphonotus , Norman. Type Rhamphonotus 

 minax, Bnsk,=^rhy?ichota. 



At p. 373 a subgenus ForateUa is instituted in which 

 is placed among other species Membranipora Lacroixii, 

 Audouin. 



At p. 380 a genus Nichtina is formed with Membranu 

 pora membranacea, Linne, as its type. 



