23 



rophvys (CI. et Lachm.), Diaphoropodon (mihi) and Amphi- 

 trenia (mihi) ? These ahnost seem to hover between Car- 

 penter's Radiolaria and Reticulosa. 



Again, looking to Wallich's proposed classification,^ Pom- 

 pholyxophrijs punicea and Heterophrys myriopoda, with no 

 definite nncleus, and no contractile vesicle, and no spicula, 

 (confined by the diagnosis) must come under one division of 

 the Order "Herjinemata,^' whilst Raphidiophrys, likewise with 

 no definite nucleus and no contractile vesicle, but with sj)icula, 

 would come under another division of the same Order ; yet I 

 fancy it could hardly be doubted but that, although none of 

 those named show a " nucleus," these forms come most 

 naturally in alongside of the solid-skeletoned " Protodermata" 

 (Wallich). I never saw a contractile vacuole in the little 

 Gj'omia socialis, but it has a nucleus, thus seemingly with 

 only half a right to a place under Wallich's Order Proteina, 

 where, however, seemingly clearly should come Pleurophrys 

 and Diaphoropodon. 



In neither Raphidiophrys, Heterophrys, nor Pompho- 

 lyxophrys, can I see anything capable of being called a 

 nucleus, such as occur, for instance, in Actinospherium. If 

 we admit the validity of that class, are they then " Monera " 

 (Haeckcl') ? Even some oi those can secrete siliceous struc- 

 tures during a develojjniental condition. The nature of the 

 sarcode of the body-mass in the new form here described, 

 which, as we have seen, is far indeed from being "structure- 

 less and homogeneous " — a characteristic in the diagnosis 

 of the Class given by Haeckel, placed even before the absence 

 of a " nucleus," — would in itself, no doubt, place them above 

 the " Monera " in the system. But Haeckel would now 

 claim Actinophrys sol as a Moneron, but that form could 

 hardly be placed far from such as Heterophrys Fockii, which 

 indeed, like A. sol, does not show a nucleus, and they agree 

 in possessing a marginal pulsating vacuole. 



It, therefore, seems to me that an attempt to place the 

 forms I have brought forward in this paper in their Classes 

 or Orders is not yet to be accomj^lished. We must just for 

 the present consider the forms on Plates XVI and XVII as 

 annexing themselves most closely to Radiolaria (Haeck.), 

 forming a Heliozoan subgroup, wanting a central capsule, of 

 which Actinophrys sol is the very simplest representative ; 

 whilst the forms upon Plate XX, even including Diaphoro- 



' Wallicli " Ou the Structure and Affinities of the Polycystiua," in ' Quart. 

 Journ. of Micr. Science,' vol. v, page 57. 

 - ' Mouograpbie der Moneren.' loo. cit. 



