320 Dr. Wallich 07i the RUzopods. 



comprises the Gromidse, Forarainiferaj and Poljcystina, the 

 nuclear granules being in this order diffused, and assuming 

 the multiple character of sarcoblasts, which, on separation 

 fiom the parent sarcode, constitute the primordial segment 

 of the new brood. It was then also stated that Ihe con- 

 tractile vesicle does not make its appearance in the lowest 

 order, namely the Herpnemata, or the intermediate order, the 

 Protodermata, but occurs for the first time in the highest 

 order, or Proteina, in which are associated together the Acti- 

 nophrjnse, Lagynidse, and Amoebidse, both nucleus and 

 contractile vesicle being invariably present in all the families 

 of this order, although sometimes obscured from view in the 

 testaceous genera. At the period referred to, viz. June 1863, 

 neither of these two organs bad as jet been noticed in Gromia ; 

 but a few weeks afterwards the discovery of the nucleus in 

 this Ehizopod was announced as follows : — " As bearing 

 directly on the characters of the Amoebidse I have to record an 

 important fact which revealed itself during my examination of 

 the material containing Amosha villosa] 1 allude to the detec- 

 tion of a well-marked nucleus and nuclear capsule in Gromia 

 oviformis. The contractile vesicle I failed to trace, but, in 

 the presence of the manifest analogy existing between the 

 Gromidee and Lagenidse, it is, I think, extremely probable 

 that this organ also may yet be detected. Should it be so, 

 the transfer of Gromia from the lowest to the highest ordinal 

 type of Rhizopod structure would be rendered necessary." — 

 Annals, Aug. 1863, p. 123. 



Having followed up this subject still further, the following 

 statement was made by me in the ' Annals ' for December of 

 the same year (p. 450) : — "I may here repeat the statement 

 made in the ' Annals ' for August last, p. 123, that I had 

 detected a distinct nucleus in Gromia oviformis. At a later 

 period, but only once, I detected an equally distinct contractile 

 vesicle. But until further opportunities present themselves 

 of determining whether or not these two organs occur univer- 

 sally in all the members of the genus, I would reserve my 

 final opinion on the subject." Finally, in a paper " On the 

 AfEnities of the Polycystina," read at tlie Royal Microscopical 

 Society in May, and published in Quart. Journ. Microsc. 

 Science for July 1865, my first tabulated classification of 

 the Ehizopods appeared, the three orders being defined as 

 shown opposite : — 



