181 HYDK01DA. BALE. 



orifice is formed iu front of the axil, on the apophysis of the new 

 branch. Through this proceeds an offshoot from the coenosarc 

 which takes its course through the axil to the back, where it 

 bifurcates and grows up the branches as described, establishing 

 communication with them at intervals by the formation of small 

 foramina as is usual in compound stems. As the supplementary 

 tubes accompany lot-It jointed tubes it would seem that the 

 branch as well as the stem should become fascicled, but so far as 

 I observed the supplementary tube only proceeds for a very 

 short distance up the base of the hydrocladiate branch, which 

 remains monosiphonic for the rest of its length, while on the 

 other branch, the proximal part of which is destined to form part 

 of the stem, the fascicnlation is continued upward. It is intei'esl- 

 ing to compare the fasciculation of this species with that of 

 Halicoriutria vegce and H. tubalifent, in which supplementary 

 tubes originate at the axils and grow down- the stem. 



The regularity of the hydrotheca-margin is noticeable. All the 

 teeth are alike except that the anterior one is somewhat larger. 

 Of the two cauline sarcothecae in front of each internode, the 

 lower is further from the hydrocladium than the other, and both 

 are aboiat in the middle line, so that they form a straight series 

 down the front. The proximal part of a branch may bear as 

 many as fifty sarcothecas in line, possibly more. 



The corbulse are commonly borne in rows of four or five. The 

 large secondary leaflets differ strikingly in the sparseness of 

 their sarcothecas from those of A. calycifent. The lateral spurs 

 support their hydrotheca? quite outside the corbula-wall, and are 

 then continued into a large spatulate process which however may 

 bear only two sarcotheca?, with a blunt point between them; 

 towards the end of the corbula they may become much larger, 

 with more sarcothecse. 



0( ,. Great Australian Bight, Long. 12G45'E, 190-320 

 fathoms; Long. 130 40' E, 160 fathoms. 



AGLAOPHENIA CARINIFEBA, sp. itov. 

 (Plate xxxviii., figs. 1-2.) 



Hydrophytoii reaching about a foot in height, polysiphonic 

 (unbranched ?) ; stems divided by oblique joints into internodes, 

 t'lirh supporting a hydrocladium. Hydrocladia long (about an 

 inch), alternate, both series springing from the front, nodes 

 oblique. 



Hydrotheca? set at an angle of about 40, deep, a rudimentary 

 ridge on the adcauline side near the base, continued into a 

 slight intrathecal fold nearly or quite crossing the basal part of 



