106 



Localities. — In various heath pools in Co. Wicklow. 

 Cork, Kerry, Westmeath ; scanty, but not unfrequently en- 

 countered. 



Affinities and Differences. — So fax as I can see this little 

 rhizopocl appears to be unique, for the outer stratum bearing 

 the problematical hyaline vesicles or globules has no parallel. 

 They are, as I have mentioned, readily cast off, and appear 

 to me sometimes as if they became collapsed in specimens 

 some time kept. In my previous account of it (ante) I 

 doubtfully referred to its possession of an outer sarcode 

 border or region containing the hyaline globules ; but, by a 

 renewed examination, I have now little doubt but that such 

 actually exists, though of considerable tenuity and very jjale 

 in colour. I had likewise supposed that, amongst freshwater 

 rhizopoda, it was without a parallel in the red pigment 

 granules, but that statement must be modified inasmuch as 

 some of the forms belonging to Greef's new genus Astro- 

 disculus also show red granules in their interior, but our 

 form by no means belongs to that genus. I doubt not, 

 however, that the present is actu.ally identical Avith another 

 of Greef's forms as I have indicated above — I mean that 

 which he has named Hylolampe fenestrata. But as my 

 description and nomenclature preceded his, mine naturally 

 takes the j^riority, and his name falls to the rank of a 

 synonym. But whilst, indeed, I have no doubt of the 

 correctness of this assumption, as will be seen I am neces- 

 sarily at variance with Greef in my interpretation of the 

 structure of the form in question. I myself have not been 

 able to see any " nuclear " structure. Greef's account of 

 his Hyalolampe (equivalent to my Pompholyxophrys) runs 

 thus : — " This form is surrounded by a beautiful siliceous 

 shell which appears to be composed as if of individual glass - 

 globules laid upon one another. At first glance I imagined 

 that I had befoi'e me an alveolar vacuolar (schaumiges) 

 sarcode-net, but I soon satisfied myself by an examination of 

 the contours that this was of the former structure." He 

 then goes on to say that he satisfied himself of the siliceous 

 nature of what he regards as a true perforate case (Gitterhaus ; 

 Gittergehause) by the application of acetic acid, caustic 

 potash, and even sulphuric acid, and he would refer this form, 

 along with Clathrulina, to the Ethmospha^rida. Now, if I 

 am at all right in believing our forms to be one and the same, 

 I very deferentially think this account of the structure is 

 inaccurate ; as I have already described I do not think this 

 form is surrounded by a " Gittergehause " ; the globules are 

 free and separate, included by a delicate sarcode layer, and 



