BY E. F. HALLMANN. 365 



( b ) Longer raphides, occurring only in dragmata, straight, cylin- 

 drical, gradually sharp-pointed, and slightly dilated at intervals. 

 Size : (i)130 to 255 by 2-5 /x; (u)120 to 245 by 1-5 /x. 



(c) Shorter raphides, occurring only in dragmata; straight, fusi- 

 form. Size : (i)45 to 120 by 4-5 jx; (ii)40 to 95 by 2*5 /x. 



(fZ)Sigmata, very variable in size, but apparently not separable 

 into two groups; the larger, as well as many of the smaller, are 

 intermediate in shape between ordinary and flagellate sigmata. 

 Length : (i)15 to 76 /x; (u)15 to 70 /x. Stoutness : (*)3-7 /x; {ii) 

 1-5 /x. 



(e)Microstongyles, often somewhat pointed at one or both ex- 

 tremities ; rare, but occurring in all specimens. Size : 16 to 50 by 

 (i) 3 to (ii) 4 /x. 



Loc. — Port Jackson. 



Remarks. — On the evidence of a single specimen from Port 

 Phillip, which I identify as Gellius phillipensis Dendy(12), this 

 latter species is not more than a variety of G. rapliidiophora, from 

 which it differs chiefly in the fact that its longen raphides are 

 immeasurably fine. In the specimen referred to, microstrongyles 

 also occur, but are exceedingly rare, only a single example having 

 been found in two slide-preparations. 



G. raphidiophora is distinguished from all other species of the 

 genus, not only in having two sorts of raphides, but also in the 

 possession of microstrongyles; its sigmata, too, are of unusual 

 form, and recall those of certain species of Biemna — e.g., B. chilen- 

 sis Thiele(42), and B. hamifera Lundbeck(31). This fact con- 

 cerning the sigmata seems not unwortliy of notice, since also in 

 Biemna the microscleres may include raphides and — if not micro- 

 strongyles exactly — siliceous globules. Actual microstrongyles, in 

 association with raphides and sigmata, are elsewhere known to 

 occur only in the somewhat aberrant Tylodesma microstrongyla 

 Hentschel(21), and AUantophora plicata Whitelegge(57), two 

 species which, I think, are allied to one another, though scarcely to 

 be regarded as congeneric; but whether these microstrongyles 

 (showing as they do some trace of centrotylosis) are homologous 

 with those of G. raphidiopfiora, it is at present impossible to sa}^ 



