410 



REVISION OF THE MONAXONID SPONGES, 111., 



^ 



w 



\i 



three : when one only is developed, it is situated not centrally, 

 i.e., not in continuity with the axis of the spicule, but laterally. 

 The spicules are from 325 to 410 /x long by 8 /x at most in 

 diameter. 



(6)Largeranisochel3e, occurring 

 fairly abundantly in rosettes, 

 and in lesser number scattered 

 singly; they closely resemble in 

 form those of P. hidentata, but 

 are larger, measuring from 34 to 

 39/x in length. 



(c). Smaller, scattered aniso- 

 chelse, in form much like the 

 preceding, measuring from 1 8 to 

 22-5 fjL in length; they are about 

 as numerous as the scattered 

 larger chelse. 



{d). Sigmata, similar to those 

 of P. hidentata; fairly abundant; 

 measuring 44 to 48 /x long from 

 bend to bend, by at most 3/x 

 thick in the middle. 

 Log. — Port Jackson. 

 Remarks. — From the same 

 locality as P. pe7iicilliu7n, comes 

 P. repens Whitelegge. The 

 a, Subtylostyli. a', Apical ends of latter, judging from its descrip- 

 subtylostyli. 6,Larger anisochelse. tion-for I have been unable to 



6 '.Developmental form of preceding. ^ i • i i 



' ^ , , , find any specimen or mounted 



c,Smaller anisochelae. a,Sigmata. . ,._ . _ 



slide or it diners from F. peni- 



cillium in quite a number of points, but the differences are of 



degree rather than of kind, and may be due to nothing more 



than individual variation. Whether this is so, it is not yet 



possible to decide, since both species are known only from single 



specimens. 



The several species, P.penirAUiiim, P. moluccensis, P. hidentata, 



P. repens, and P. G?icAe?a— enumerating them in the order in 



Mycale 



Fig. 15. 

 {Par taper ella) 



penicilLium. 



