POLYZOA OF WATERWORKS. 455 



of the above comparison, is to support the conclusion that the 

 Torquay material should be referred to that species, and I lay- 

 special stress on the unequal development of the annulus on the 

 two sides of the statoblast. Kraepelin's var. muscosa was 

 characterised by him as a luxuriantly branched form of Plmna- 

 tella in which the branches were not cemented together (in this 

 respect differing from his var. spongiosa *). The Torquay sj)eci- 

 mens seem to me to agree closely with those from Hamburg in 

 their mode of growth, and I have accordingly thought it best to 

 refer them to the same variety. 



Literature cited. 



1856. Allman, G. J. — "A Monograph of the Freshwater Polyzoa." 



London, Ray Society, 

 1911, Annandale, N. — "Freshwater Sponges, Hydroids, and 



Polyzoa," in ' The Fauna of British India.' London 



(Taylor & Francis). 

 1890. Braem, F. — " XJnt. lib. d. Bryozoen des siissen Wassers," 



Bibl. Zool., Bd. ii. Heft vi. 

 1911. Braem, F. — " Beitrage zur Kenntnis der FaunaTurkestans : " 



vii. " Bryozoen," Trav. Soc. Imp. ISTat. St.-Petersbourg, 



xlii. Lief. 2, Teil 1, 

 1904, Chirica, C. — "Notes sur les Bryozoaires de Roumanie," 



Ann, Sci. de I'Universite de Jassy, iii. pp. 4-14 (sep., 



pp. 1-11). 

 1888. DE Guerne, J. — " Sur la dissemination des organismes 



d'eau douce par les Palmipedes," 0. r. hebd. des Seances 



et Memoires de la Soc. de Biol. (Paris), 8 ser., v. Ann, 



1888, p. 294. 

 1890. De Vries, Hugo. — "Die Pflanzen und Thiere in den 



dunklen Raumen der Rotterdam er Wasserleitung," 



Bericht lib. d, Biolog. Untersuchungen d. Crenothrix- 



Commission zu Rotterdam vom Jahre 1887. 

 1909, Hartmeyer, R. — " Bryozoen, Moostierchen," in A. Brauer, 



' Die Siisswasserfauna Deutschlands,' Heft 19, p. 49. 

 1904. Hawksley, 0. — Presidential Address to Section G (Engi- 

 neering), Southport Meeting, 1903, ' Report Brit. Assoc' 



pp. 764—, "Water-Supply." 



1904, HiCKSON, S, J. — Presidential Address to Section D 



(Zoology), Southport Meeting, 1903, 'Report Brit, Assoc' 

 p. 675, 

 1899, Kemna, a.—" La Biologie du Filtrage au Sable," Bull. 

 Soc Beige Geol. xiii. Ann, 1899, Memoires, p. 34. 



1905. Kemna, A. — " La Biologie des eaux potables," Ann. Soc. 



roy. Zool, et Malacol. de Belgique, xxxix. (1904) p. 9. 



* Hartmeyei- (09, p. 53) describes Kraepelin's var. sjjongiosa as a distinct species, 

 under the name of Flumatella spongiosa. 



