TASMANIAN HYl>KOZOA HlUiidS. 301 



Tlie oci'urreTice in the collection oF sevei-al specimens of 

 AiiJin>iiliciiiii fi(.<:iiiiiiilrii, with male corbiiljie, is of interest, since 

 tlie female coi-bulft? only were known. Tlie lai'gest sfjecimen, 

 40 em. in liei<^lit, spiinys fi-om a dense mass of liydi-orlii/.al 

 filaments, and divides immediately into three main stems, two 

 of which aie bi-oken oft". The remaininji;' stem bears branches 

 mostly in opposite pairs, both series in one [)lane and all facing 

 one way. 



(Joiiosoiin-. — Gonangial pinnsf general I}- in paii'S, with the 

 first five internodes bearing saj'cothecfe only. Coi'bula (male) 

 long. Consisting of np to about twenty-four pairs of alternate 

 ribs, springing from separate intei-nodes of the lachis as nar- 

 row pinnules, but expanding above into broad leaflets. Foi' 

 most of its length the corbula is closed ; towards the distal 

 part, however, the main leaflets become shortened and finally 

 separate, till at the end they are abbreviated close down to tlie 

 latei'al spurs. The latter project outward and forward fi'om 

 the distal edge of each lib just above its origin, bearing two 

 series of sarcothecfe (up to four or five on each side), but no 

 hydrotheca?. 



The male corbula? of A. fituriKdiicK, are as Bale described 

 them in ^-1. diDiiiei'lyi^'^ and A. nmcrocarpa,^'^ i.e. with the leaflets 

 abbreviated and separated at the end of the corbula. In the 

 female corbulje of A.ti(!<ii(inilc(<,i\\e ci-ests are most luxuriantly 

 develo[)ed, and the contrast between tlie female and the pres- 

 ent male form is greater than that which exists between the 

 male and female corbula? of A. hillardi .^'^ Bale has already 

 recognised an instance of sexual dimorphism in the corbulse of 

 A. hillardi, in which those of the male are closed throughout, 

 and not at all different at the distal end, which is like the rest 

 up to the blunt tei'mination. 



12 Bale — Biological Results " Endeavom-," ii., 1, 1914, p. 41, pi. iii., 

 fig. 4, pi. vi., fig. 4. 



13 Bale— Proc. Linn. Soc. N. S. Wales, (2), iii., 1888, p. 791, pi. xxi., 

 figs. 3, 4. 



1^ Bale — Biological Results " Endeavour," ii., 1, 1914, p. 33, pi. iii., 

 fig. 3, pi. iv., fig. 3. 



