Australian Hydroids. 347 



PlUMULAHIA LAGENIFERA Allllian. 



Flu malaria lageiiiftra, AUman, Jourii. Lin. Soc, Zool., 



xix., 1885, p. 157, pi. xxvi., figs. 1-3. Nutting, Amer. 



Plum., 1900, p. 65, pi. vi., figs. 6-10. Torrey, Univ. 



of Calif. Publ., Zool., i., 1902, p. 77; var. septifera, 



p. 78, pi. xi., figs. 101, 102. Fraser, Bull. State Univ. 



Iowa, vi., 1911, p. 82. 

 Pliimularia turgida. Bale, Proc. Linn. Soo. N.S.W. (2), 



iii., 1888, p. 779, pL xx., figs. 12, 13. 

 Plumularia californica, Marktanner-Turneretscher, Ann. 



naturh. Hofmus. , v., 1890, p. 255, pi. vi., figs. 4, 4a. 

 FlumtUaria setacea, Clark, Trans. Conn. Acad., iii., 1876, 



p. 261, pi. xli., figs. 1, 2. 



The F. lagenifera of Allman, as well as F. multinoda^ described 

 in the same paper, was represented as possessing several short in- 

 ternodes, instead of one, between every two hydrothecae. Nutting, 

 however, who has examined Allman's types, finds that this supposed 

 character is by no means constant, but that the hydrocladia in the 

 specimens which he examined are composed of alternately long and 

 short internodes, just as in F. setacea, etc. As F. iiorgida, thougli 

 certainly not agreeing with Allman's description, seems to differ in 

 no essential from the form described by Professor Nutting, 1 

 exchanged specimens with that gentleman, who considers the two 

 forms to be referable to the same species. F. californica M.-T., 

 is, according to Nutting, F. lagenifera w^ith the septal ridges well 

 developed, as in Torrey's var. septifera. Torrey finds in F. 

 lagenifera 1-4 short internodes at the base of the hydrocladia, and 

 1-3 between the hydrothecal internodes; but he says that in var. 

 septifera the intermediate internodes are single. Fraser finds that 

 some specimen.^ have 2-3 short internodes at the base of the hydro- 

 cladia, and occasionally more than one intermediate. But in all 

 cases wliere more than one occur together only one of them bears a 

 fiarcotheca. In the few specimens which I have seen from Cali- 

 fornia and Australia, I have not met with any instance of this 

 repetition of the short internodes. 



The strong development of the septal ridges is not invariable; 

 in some specimens it is not much moi-e pronounced than in P. 

 iietac((i; often, however, these ridges are more thickened, quite* 

 eneirclinu tlie interioi- of the internodes, and sometimes l)eing 

 accoi))i>.inied by external constrictions which add to the charac- 



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