258 Transactions. 
longirostris Kirchenpauer, but the gonosome is said to include a corbula. 
I do not know any corbula-bearing species with hydrothecae of this 
t 
prove to belong to different genera).* 
Aglaophenia acanthocarpa Allman. (Fig. 14.) 
Aglaophenia acanthocarpa Allman, 1876, p. 274 : Farquhar, 1896, p. 467. 
Aglaophenia laxa Hilgendorf, 1911, p. 541. 
? Aglaophenia divaricata var. acanthocarpa ? Jáderholm, 1916-17, p. 18. 
Not A. divaricata var. acanthocarpa ? Bale, 1915, p. 313. 
Not A. laxa Allman, 1876, p. 275. 
Hydrophyton slender, polysiphonic, branched, branches springing from 
the supplementary tubes. Hydrocladia close, alternate, one on each intet- 
node, rising at an angle of 40—45°, and strongly directed forward ; nodes А 
oblique. 
very large. 
Mesial sarcotheca a little longer than hydrotheca, adnate to it as far 
as margin, and then projecting outward, free part forming a tube nearly 
equal in diameter from lateral aperture to end, and bent forward, with 
ngial pinna replacing a hydrocladium, the first internode bearin 
Gona | 
а hydrotheca. Corbula open, with about 15-20 strongly-arched be 
; : an m a separate internode of rac 
furnished with two lateral series of long slightly-curved tubular sarcothecae, 
the two proximal ones on distal side of each pinnule without correspond- 
with the form from Kermadec Islands collected by Mr. W. R. B. Oliver. : 
and described by Hilgendorf as A. laza (specimens of which were given 
to me by Mr. Briggs). They also indicate that the form described by me 
as A. divaricata var. acanthocarpa is not the same as Allman's species. 
opu ne С сыы uci ic = 
* Stechow in a recent paper in Archiv für Naturgeschichte, 1921, pro the name 
б ж , , poses * i 
Tae giga zelandica. But in the very possible oan of the two deris being identi- 
| as of different genera the specific name huttoni may stand for both species. 
