48 " ENDEAVOUR " SCIENTIFIC RESULTS. 



of the primary corbula-1 eaves, arching over and overlapping those 

 in front of them. Similar structures, but much less regular and 

 symmetrical, occur in A. crucial is and other species, where they 

 are formed by a development of the free margins of the com- 

 ponent leaves ; here however, they originate independently, and 

 are not continuations of the margins. The lines of union of the 

 corbula-leaves are smooth, and not bordered by rows of 

 sarcothecee, but such a row usually runs up the leaflet from the 

 point at which the crest-leaflet starts. 



LOG. Great Australian Bight, 40 to 100 fathoms. 



AGLAOPHENIA DECUMBENS, sp. nov. 

 (Plate iv., fig. 4; Plate vi., fig. 6.) 



Hydrophyton lax, slender, polysiphonic, about four or five 

 inches in height, sparingly branched ; branches springing from 

 the supplementary tubes, mostly in the distal portions of the 

 colony, irregular, forming angles with the stem of about 45. 

 Hydrocladia slender, alternate, one on each Intel-node, both series 

 directed towards the front, and rising at an angle of about 40, 

 nodes transverse. 



Hydrotheca? long, parallel with the hydrocladium, a sl'ght fold 

 or ridge near the base on the adcauline side, directed a little 

 forwards ; border with a. median anterior tooth, bent outward, 

 and four nearly equal regular shallow triangular teeth on each 

 side, the last pair behind the lateral sarcothecaB ; back adnate. 

 Hydrothecal internodes with curved septal ridges opposite the 

 intrathecal fold and the base of the lateral sarcothecse. 



Mesial sarcotheca? a little longer than the hydrotheca?, directed 

 very much forward, free part projecting beyond the hydrotheca- 

 margin, tubular, with distinct terminal and lateral apertures, and 

 an aperture communicating with the interior of the sarcotheca. 

 Lateral i-avcothecse subtubular, directed forward and outward, 

 rising about as high as the hydrotheca-margin ; terminal and 

 lateral apertures distinct or united, Cauline sarcothecaa large, 

 canaliculate, two on the rachis at the base of each hydrocladium. 



Gonosome ? 



Colour. Light brown, stem and branches darker. 



H There is some doubt as to whether this species is identical with 

 the A. brevicaulis, Kirchenpauer. That species is described as 

 having a very thick but short stem, from the summit of which 

 spring several long slender branches, but the figure conveys the 



