330 Dr. Wallich on the Rhizopods. 



transferred from the lowest to the highest order of the Rhizo- 

 pods. Had Prof. Leidj read the observations made by me 

 at a somewhat later period (to which attention has been 

 already drawn at pp. 322, 323, ante), he would have seen that, 

 for the important reasons assigned, Qromia had been so 

 transferred, and would, in all probability, therefore have 

 accorded the fact as prominent notice as he accorded the state- 

 ment contained in the paragraph above quoted. But he made 

 the matter worse by stating at p. 279 of his work, without 

 any further explanation, that — 



" Prof. Schultze intimates the absence of a contractile 

 vesicle in Qromia ( Arch. f. mikrosk. Auat. 1875, p. 116) ; 

 but Dr. Wallich remarks that in one instance he detected this 

 temporary (!) organ in Qromia oviformis : " the most un- 

 intelligible part of the affair being that he should have 

 stopped short in his quotation of my paper at the very point 

 where my reasons were given for not deeming it expedient 

 to speak positively about the presence of the contractile vesicle 

 in Qromia on the strength of a single observation, and conse- 

 quently determining to await its confirmation through a suffi-- 

 cicnt number of further observations. 



I repeat, had Prof. Leidy cited the whole of the passage 

 referred to, he might have been induced to consult two 

 of my later papers, namely one on " The Affinities of the 

 Polycystina ' (mentioned in his l^ibliographical list under 

 my name), which was published in the ' Quart. Journ. Microsc. 

 Science' for July 1865, and another " On the Fundamental 

 Error of constituting Qromia the type of Foraminiferal 

 Structure," published in the ' Annals ' for Feb. 1877, and 

 have thus avoided so obvious a misapprehension of my obser- 

 vations, and one so calculated to throw unmerited discredit on 

 the entire basis of my classification. 



But so completely did Prof. Leidy misinterpret or over- 

 look my writings in relation to Gromia, that at p. 277 he 

 expresses himself as follows, under the head of " Forami- 

 nifera :" — " These, though consituting the most extensive and 

 important order of the Ehizopods, are almost exclusively 

 marine. A single well-known genus, Qromia^ is represented 

 by several species inhabiting salt and fresh water ;" and in 

 the page following the last named, "■ The genus is of special 

 interest because it is a representative, in the sim^ylest condition, 

 of that great order of Rhizopods, the Foraminifera, which are 

 exclusively marine with the exception of the present one, 

 Qromia^ And at pp. 278-279 he says that the body of 

 Qromia " contained a large clear or pale gi-anular nucleus situa- 

 ted centrically or eccentrically, and also variable proportions of 



