107 



sometimes (I think) appear even collapsed ; they are not 

 t'omparahle to the solid, fenestrate, true " Gittergehause " of 

 Clathrulina, and, in fact, this form in the possession of these 

 structures stands alone, so far as I can see. The creature is 

 not at all uncommon in our moor pools, and I only wonder it 

 has hitherto heen overlooked; it is, however, minute, and 

 never to my eyes has shown any stage of development, and 

 but seldom shows any incepted food, though sometimes, 

 indeed, distorted by an unusually large morsel and the 

 rejectamenta discharged by a sudden effort, which could 

 hardly be the case if enclosed in a solid or connected 

 " Gittergehause/' But as Greef has more to convey on the 

 forms brought forward by him perhaps he may hereafter 

 clear up my difficulties and remove the apparent discre- 

 pancies. 



Genus, Heterophrys (Arch.). 



Generic characters. — Rhizopod composed of two distinct 

 sarcode regions — the imier one or more dense, globular sa)'- 

 code masses often bearing colouring granules — the outer form- 

 ing a complete investment thereto, more or less coloured, not 

 enclosing any spicula or differentiated structures, but giving 

 off' at the circumference marginal processes, and allowing the 

 passage forth from the inner sarcode mass of numerous linear, 

 elongate, granulferous, non-coalescing pseudopodia. 



The Rhizopoda falling under this genus appear individu- 

 ally comparable to a Raphidiophrys or an Acanthocystis, the 

 outer region destitute of spicula — to a Pompholyxophrys, 

 the outer region destitute of the peculiar globular structures 

 characteristic of that new genus — to an Astrodisculiis, the 

 outer region not condensed, but of a mobile sarcode, and the 

 inner without the " central capsule ;" so far differing thus 

 from all these in a negative manner, and, further, difjfering 

 from them in a positive manner, by the margin of the outer 

 region giving off the characteristic processes. In the fringe- 

 like border formed by the numerous fine linear processes of 

 Heterojjhrys myriopoda, however, there is much resemblance 

 to the same portion of Greef's form of Acanthocystis, un- 

 named, which, as I have mentioned, appears to me well 

 distinguished as a specific form, figured on his PI. XXVII, 

 fig. 18. This genus differs from Actinophrys sol in the 

 amount of differentiation in the body-structure expressed in 

 the two sharply-marked strata of sarcode of which it is 

 composed. 



