BEYOZOA. FROM FEANZ-JOSEF LAND. 179 



Sin.; A. disciforme, Sm. ; A. disjunctum, Hincks ; A. lineare, 

 Hincks ; A. parasiticum, Flem. 



British. A. gelatinosum., L. ; A. hirsutum, Elena. ; A. onytili, 

 Dalyell ; A. alhidum, Aid. ,; A. excavatum, Hincks ; A. lineare, 

 Hincks ; A. parasificum, Flem. ; A. poli/oiom, Hass. ; A. suhviride, 

 Couch. 



Mediteeeaneak. a. gelatinosum, L. ; A. mytili., Dalyell ; 

 A. duplex, Proulio. 



S. Afeica. a. fjelatinoswn, L. ; A. fiustroides, Busk. 



There has been but Jittle anatomical work done on Aleyonidium, 

 but there is one very valuable paper by Prouho, Arch. Zool. exp. 

 ser. 2, vol. x. no. 4, 1892 ; and Farre, in the ' Philosophical Trans- 

 actions/ 1837, under the name Halodactylus, gives figures of 

 cross sections, but without detail. The zoarial cuticula is very 

 thick, and tliere is no zoarial wall consisting of large vacuolated 

 cells, as in the Phylactolaemata (see Braera, Davenport, and 

 Kraepelin). 



16. Alctonidium gelati^tospm {Linn.}. (PI. 20. fig. 7, and 

 PL 21. figs. 6, 7.) 



To the list in Miss Jelly's Catalogue, add : — 



Aleyonidium c/elatinosum, Hincks, Ann. Mag. Nat. Hist. ser. 5, vol. xiii. 

 p. 207 ; Levinsen, Zool. Danica (Danske Dyrj, p. 80, pi. 7. figs. 21-26 ; 

 Bidenkap, " Die Brj'ozoen von Spitzbergen iind Konig-Karls Land," 

 Fauna Arctica, vol. ii. p. 630, pi. 10. tig. 6 ; Robertson, " Bryozoa," 

 Harriman Alaska Expedition, Proc. Wash. Acad. Sci. vol. ii. p. 329. 



There are some specimens growing from a thin stalk which is 

 about 12 mm. long and 1-2 mm. wide; at the end of this stalk 

 the cylindrical unbranehed colony becomes much wider, to about 

 20 mm., and in one specimen attains a length of about 100 mm. 

 Levinsea has figured this form in his ' Danske Dyr,' pi. 7. fig. 21, 

 and it corresponds in shape with Bidenkap's figure of A. hirsutttn, 

 0^. cit. pi. 10. fig. 5. This group has a white leathery appearance. 

 The other group is frequently branched and iobed, and the 

 specimens never attain to so great a length, being about 25- 

 50 mm. long and about 4-5 mm. in diameter. These specimens 

 look more fleshy and are a dirty grey, and one was figured by 

 Levinseu, Danske Dyr, pi. 7. fig. 22. The external cuticula of 

 this form contains a great quantity of imbedded diatoms and 

 other debris, so that it seems as if the colour depends upon this 

 foreign matter, for in the whiter specimens the diatoms are 

 absent. The cuticula surrounding the colony is fairly thick, 



13* 



