Austi-al 1(1 II H jitl loids. 77 



fluriU' (if i). rdliciihitd arc t'riM|iiciitiy (Hiitr as I liiii-\vallc<l as tliosu' 

 ■of ('. n/frf/ni. Howwcr. it is admitted that (). cfilirulato has tlic 

 liydnithoear cdinpi-i'sscd while C. i.'ife(/r(f lias not, and in face of 

 tliat fact it \voidd rc([uire very sti-ouj^- evidence to ))rove the identity 

 of the two foi'iiis. It may l)e mentioned that Calkins claims to l)e 

 al)le to disliiiLinish between them by the diaphrauni, which in O. 

 (•(iliviihitii is sim])ly the inward thickening- of the peiisarc. while in 

 C . i iitei/rd. according' to this obsei'vc'r, theic is a special diapliia<;ni 

 overlying- the jU'risarcal thickeninfi'. Hioch (Bergens Museum 

 Aarbog 1 !)()."). Xo. G. p. 10. fig. 1), descriljcs and figures this 

 character as pertaining to (J. cdliciihttd , \n\i nothing of the soi't 

 ■exists in any specimen of C. cnliculata observed by me. noi- indeed 

 in any of the species ascribed in this papei- to the genus Orfhop>/xis. 



Orthopyxis macuocona, (Von Leudenfeld). (Pis. XI. and XII., 

 Fig. 2). 



Ct/iii [KniiiJI iia cah/ciilntn var. DUiln'oi/oiid . Von Lendenfeld. 



Pi'oc. Lin. Soc. N.S.W., ix., 1<XS4. p. 922. 

 (Jniiipdiiiilaria calicidatd vai-. inakroyoiid. Bale.'Proc. Lin. 

 Soc. N.S.W. (2), iii., 1888, p. 755. pi. xiii., fig. 4-8. 

 Farquhar, Trans. N.Z. Inst., xxviii., 1895, p. 459. 



Hydrorhiza very stout, peduncles slightly to strongly waved, 

 three or four times as long as the hydrothecae. 



Hydrothecae very much compressed, Avith the aperture circular 

 or elliptic ; in the broad aspect with very wide base and with the 

 ■cavity usually equally w'ide from the aperture to the floor, which 

 is quite flat; in the narrow aspect with a somewhat abrupt decrease 

 of diameter about the middle; wall-thickening in the form of a 

 stout convex external band completely surrounding the upper half 

 of the hydrotheca; margin plain, slightly everted. Length .28— .45 

 mm. ; width of the broad side at aperture .22 — .28 mm. 



Gonothecae very large, oblong or ovate, often irregular, 'smooth, 

 rounded above, very slightly compressed; length about 1.65 — 1.87 

 mm., width, .82 — .90 mm. Gonophore a medusoid bud, not becom- 

 ing free. 



Hah. — Port Phillip (Von Lendenfeld); New Zealand (Farquhar); 

 Bondi (Australian Museum). 



The character which led Von Lendenfeld to distinguish the variety 

 was the very large size of the gonangia, which otherwise much re- 

 semble those of 0. calic-ulata, being like them, subject to extreme 

 variation in form. They are of very firm perisarc. The hydro;^ 



ujIlibrarV ' 



jl LIBRAP 



