52 



Fam. Nolellidae (new name). 

 Cylindroeciidae Hincks, 1880, a Hist. J5rit. Mar. Pol.", p. 534. 



If, as explained below, the familiar name Cylindroecium should be replaced by Nolella 

 Gosse, it appears to follow that the Family-name Cylindroeciidae, used by Hincks and other 

 authors, should be replaced by Nolellidae, taken from the type-genus. 



The form which I describe below as Nolella annectens is so similar to Arachnoidea on 

 the one hand and to species of Nolella on the other hand that it is difficult to decide to which 

 of the two genera it should be referred. In its young state (PI. IV, hg. 1) this species may 

 show a strong resemblance to Paludicella. Somewhat later, with a greater development of the 

 peristome (hg. 8), the zooecium becomes very similar to Arachnoidea ; while in its final state 

 (fig. 3) it may be considered definitely a Nolella. In an intermediate condition of development 

 it diiïers from Arachnoidea mainly in being less dilated in its adnate portion. 



Nolella annectens thus supports the view that the Families Paludicellidae, Arachnidiidae 

 and Nolellidae should be associated together as proposed by Rousselet l ). Waters ~) is also 

 inclined to regard Arachnidium as allied to Nolella. 



The resemblance of Victorella to Nolella [Cylindroecium) was remarked by Kraepelin 3 ); 

 and this view has been supported by Delage and Hérouard 4 ) and by Loppens 5 ). 



The Family Nolellidae is characterised by the great development of the peristomial part 

 of the zooecium. This region is typically much elongated and its ectocyst frequently includes 

 muddy particles. The adnate portion of the zooecium is represented by a delicate stolon-like 

 tube and by the base of the peristome, into which it usually passes abruptly, although it more 

 rarely dilates gradually as it approaches this part. The branching is of the cruciform type. 

 Gizzard absent. In some cases the embryos are known to pass separately into hernia-like 

 evaginations of the peristome. 



The general structure of the zooecium in this Family is well shown in figures by Calvet i; ). 



Nolella P. H. Gosse. 



Nolella Gosse, 1855, Ann. Mag. Nat. Hist. (2) XVI, p. 35. 

 Nolella Gosse, 1856, "Man. Mar. Zool.", II, p. 21. 

 Cylindroecium Hincks, 1880, "Hist. Brit. Mar. Pol.", p. 535. 



On p. 540 of his "British Marine Polyzoa", Hincks mentions Nolella stipala Gosse as 

 a doubtful species, which is "Probably referable to Cylindroechiin" . In his original account (not 

 referred to by Hincks) Gosse gives the following diagnosis : — 



1) ROUSSELET, C. F., 1907, "Zool. Res. Third TanganyiUa Exp.", Proc. Zool. Soc. p. 252. 



2) Waters, A. W., 1910, p. 241. 



3) KRAEPELIN, K., 1887, "Deutsch. Süsswass. Bry.'', Abh. Naturw. Ver. Hamb., X, p. 16S. 



4) Delage, V. and Hérouard, E., 1897, „Traite Zool. Concrete'', V, p. 90. 



5) LOPPENS, K., 1908, "Bry. d'eau douce", Ann. Biol. lacustre, III, p. 149. 



6) Calvet, I.., 1900, "Contr. Hi>t. Nat. Bry. Eet. Mar.", Trav. Inst. Zool. Univ. Montpellier, Mém. 8, PI. VII, figs 12, 13; 

 PI. IX, figs 10, 11. 



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