322 " ENDEAVOUR " SCIENTIFIC RESULTS. 



sarcothecae, after running obliquely up the sides of the 

 corbula, when they reach the upper side curve strongly 

 forward towards the distal end, those from the opposite sides 

 meeting at a small angle. The narrowing of the leaflets, at 

 their basal portion, leaves a series of openings, much smaller, 

 however, than in some of the other species, and the lateral 

 spurs which protect these openings are short and somewhat 

 flabellate, usually with a sarcotheca about the middle of the 

 front margin, and one, less advanced, at each side of it. The 

 linear thickenings of the perisarc, which are shown in Allman's 

 figure, are commonly very irregular, and often much less 

 conspicuous and even wanting in part. The sex could not be 

 determined, and it is possible that some difference may exist 

 between the male and female corbulae ; in species where such 

 differences are known, however, they depend on the open 

 condition of the male corbulae, or the more profuse develop- 

 ment of the secondary appendages of the female ; and 

 differences of these sorts have apparently not been noticed 

 so far in connection with the present species. According to 

 Billard the gonocladium, on its proximal portion, supports 

 one or two hydrothecse, slightly or not modified ; in my 

 specimens I found a single one. 



Loc. Reef at North-west Island, off Port Curtis, Queens- 

 land. 



AGLAOPHENIA (THECOCARPUS) ARMATA, Bale. 



Aglaophenia armata, Bale, Biological Results " Endea- 

 vour," ii., 4, 1914, p. 175, pi. xxxviii., figs. 3-4. Id., 

 Briggs, Proc. Roy. Soc. N.S. Wales, xlviii., 1915, p. 

 314, pi. x., fig. 2. 



On account of the indefinite character of the small recep- 

 tacles on the corbula-leaves, I have expressed some doubt as 

 to their hydrothecal nature. Corroborative evidence, how- 

 ever, that the species is properly placed is the presence on the 

 proximal part of the gonocladium of several modified hydro- 

 thecse, this being, according to Nutting, a character found in 

 Thecocarpus, but not in typical species of Aglaophenia. 



Locs. Thirty-eight miles north-east of North Reef Light- 

 house, Capricorn Group, off Port Curtis, Queensland, 74 

 fathoms. 



Thirteen miles north-east of North Reef, 70-74 fathoms. 



AGLAOPHENIA (THECOCARPUS) TENUISSIMA, Bale. 



Aglaophenia tenuissima, Bale, Biological Results "Endea- 

 vour," ii., 4, 1914, p. 179, pi. xxxvii., figs. 1-2. Id., 

 Briggs, Proc. Roy. Soc. N.S. Wales, xlviii., 1915, p. 

 317, pi. xi., fig. 2. 



