Audrallan Hijdro'nU. 138 



The gonothecae have only been observed by Bartlett. They are 

 described as " long, obovate, smooth, aperture operculate." They 

 are of unusually long proportions, widest a little above the middle 

 and btit little narrowed above; the operculate ajDerture seems to 

 be the full width of the top, and no collar is shown. The height, 

 according to Bartlett's figure, is about 2 mm., by 1 mm. in diameter. 



8ertul.aria muellkri, n. sp. (Plate XIT., Fig.s. 1-5.) 



Shoots thickly clustered, simple, nearly half an inch in height, 

 slender, divided by conspicuous oblique joints into internodes, each 

 of which supports a pair of hydrothecae about the middle. 



Hydrothecae opposite, in contact in front, separated behind, 

 tubular, divergent, but with the distal part curved upward; aper- 

 ture very large, looking upward, with two long pointed teeth, erne 

 in front, the other, which is slightly larger, on the back outer margin. 



Gonothecae borne on the proximal part of the shoots, mostly 2-4- 

 on each; ovate, somewhat compressed, very liigh-shouldered ; oritiee 

 small, operculate, with a narrow denticulate collar. 



Hah. — Encounter Bay. 



This species has some affinity with -S'. minima, but the internodes 

 are considerably longer and more attenuated, the hydrothecae have 

 the aperture more expanded, looking more upward and with longer 

 teeth, and there is a characteristic curve upward of the outer side 

 of the hydrotheca at the top. To a certain extent they resemble 

 the hydrothecae of S. opercidnta. The gonangia are of the same 

 general type as those of S. minima, but rather irregular, many of 

 them having the shoulders very high and somewhat angular. Tho 

 shoots are produced in great profusion, a slendei- linear alga ten 

 inches long, being thickly clothed with them from end to end. 



The specimen was given to me by the late Baron von Mueller. 



PlUMULARI.V C.^.MHANl'LA Busk. 



Phininlaria rawpauuhi , Busk, Voy. of Rattlesn.. i., l.'^r)2, 

 p. 401 ; Bale, Aust. Hydr. Zooi^h.. 1884. p. 124, pi. x.. 

 tig. 5; id., Proc. Lin. Soc. N.S.W.. Ser. 2, iii.. 1S88. p. 

 776, pi. XX., figs. 1-6; id.. Tr. and Proc. Roy. Soc. Vict., 

 xxiii.. 1887, p. 94; id.. Proc. Roy. Soc. Victoria, vi.. 

 N.S.. 1893. p. 113; Marktanner-Turneretscher. Ann. 

 d. k. k. Naturh. Hofmuseums. v.. 1890. p. 255; Far- 

 quhar. Trans. N.Z. Inst., xxviii., 1896. p. 466; Billard. 

 C. R. Acad. d. Sci., cxlvii., 1908. p. 759. 



