•80 W. M. Bale.- 



I have seen Imt few gonangia, and cannot say wliat may be tlie 

 extent of their lial)itual variation. Those whieh appeal' typical 

 somewhat resemble those of 0. (inr/ulata, but that species is readily 

 . distinguishable from the present by its smooth peduncles. 



Orthopyxis comphkssa Clark. 



Caiinianitlaria com/trrssa, Chuk, Proc. Acad. Xat. Sci. 

 Philad., 1876. p. 214. pi. viii.. tig. T). 6. Hartlaub. 

 Zool. Jahrb., Suppl. vi.. 1905, Bd. iii.. p. 062. fig. M, 

 Xinko. Faune de la Russie, Hydroidea. i.. 1911, p. 172. 

 'fig. 29. 

 •Chjt'ut com presxa. Nutting. Proc. \Yasli. Acad. Sci., iii., 

 1901, p. 170. pi. xvii., fig. ."i, 4. Vanhoft'en, Deutsche 

 Sudpolarexp. 1901-3, xi., Zool. iii.. 1910. p. 303. 

 fig. 24-24e. 

 Eitcojyella campanuldria. Von Lendenfeld, Zeitschr. f, wiss. 

 Zool., xxxviii.. 18S3, pp. 497-583, pi. xxvii-xxxii. (i>ut 

 not pi. xxix., fig. 15, Dl. D^). 

 ? Cam.panularia caliculata, Calliins, Proc. Best. Soc. Nat. 

 Hist., xxviii., 1899, p. 351, pi. ii.. fig. 11-llc. pi. vi., 

 fig. lid. 

 ? Not ('(iiujxniiilarKi coinpreftxa, Jaderliolm. Schwedisciien 

 Siidpolarexp. 1901-3, v., 1905, p. 14, pi. v., fig. 6 7 

 Not Glytin rompressa. Torrey, Univ. Calif. Publ., Zook^v. 

 i., 1902, p. 58, pi. vi., fig. 49. 

 0. compressa has the hydrothecae of the same type as those nf 

 '0. caliculata, but they have the perisarcal thickening more pro- 

 nounced. Most obseT-vers figure thick-walled and thin-walled hydr 

 thecae, which are probably different aspects of the same individi;.:i 

 The chief distinction between this species and 0. caliculafa is in tht 

 peduncles. These in 0. calicitl(i1a> are twisted in a somewhat irre- 

 gular spiral; the undulations may fail here and there, but are 

 rarely a' sent altogethei'. In O. ronipresfia the stalks are iioich 

 stouter, with thicker walls, while they are never imdulated, though 

 they may be divided, especially near the hydrotheca, by several 

 distinct constrictions. Their thick perisarc appears nan-owed in at 

 the point of origin, so that their diameter at this point is little 

 more than that of the internal canal, and altogether they closely 

 resemble those of the genus Silicularia. 



Various ft^rnis of gonangia have been figured, some cuni ,i 

 others m(n-e elongated; Clark describes them as "largest at h- 



