172 Dr. G. C. Wallich on the Ti/pe 



tion or the general definitions. Owing to an oversight when 

 the MS. was sent to press in 1865 the words " monomor- 

 phous^^ and ^^ polymorphous''^ were omitted under the twice 

 repeated word " Pseudopodia " in the third order Proteina. 

 These have, therefore, been noAV inserted (see p. 171). 



Order I. IIERPNEMATA.— The Primary and Secondary 

 characters of this order are as follows : — No definite nucleus. 

 No contractile vesicle. Sarcode without any appreciable dif- 

 ferentiation into endosarc and ectosarc, consisting of homoge- 

 neous viscid protoplasm, in the substance of which vacuolar 

 cavities occasionally occur. Pseudopodia forming anastomoses, 

 and exhibiting, both along the surface and within their sub- 

 stance, the phenomena of j^seudo-cyclosis'^. 



Order 11. PROTODERM ATA.— -Definite nucleus present, 

 but no contractile vesicle. Sarcode so far advanced in differ- 

 entiation that the ectosarc constitutes a nearly hyaline stratum 

 of greater tenacity than the endosarc, which still retains 

 much of the general consistence of that of the Herpne- 

 mata. The transition, hoAvever, from endosarc to ectosarc is 

 gradual. Here, as in the last-named family, vacuolar cavities 

 occur. The pseudopodia, ichenpj-esent, are scattered and at- 

 tenuated, rarely coalescing, for the most part rigid, but still 

 highly contractile, and exhibiting in their interior and on the 

 surface only such minute granules as find their way into the 

 ectosarc. Pseudo-cyclosis manifest. Sarcoblasts conspicuousf. 



Order III. PROTEINA.— A definite nucleus and, with it, 

 a contractile vesicle ; sarcode very highly differentiated into 

 endosarc and ectosarc : the former granular, more or less nearly 

 colourless, very viscid, and exhibiting but little contractility ; 

 the latter nearly hyaline and very contractile, but never assuming 

 a membranous consistence, except during the pei'iod of encys- 

 tation. Vacuolar cavities numerous and constant, seen princi- 

 pally to occur in the endosarc. Sarcoblasts abundant and 

 frequent, but, owing to their pale colour, less easily detected 

 than those of the oceanic Rhizopods|. 



It only remains for me to add: — that the above classification 



* A term applied by me to indicate that there is no such thing in the 

 Rhizopods as a circidatory movement of any kind, apart from the inherent 

 contractile movement of the sarcode. If that ceases for a moment, the 

 movements of the granides cease. See " Further observations on Amoeban 

 Rhizopods,'^ Ann. & Mag. Nat. Hist. Nov. 186.3. 



t See page 16o, ante, note. Sarcoblast was the name given by me to the 

 " yellow cellules"' of MM. Claparede and Lachmann, indicating their re- 

 productive function, which these observers had failed to recognize. 



X For the complete details of this classification I must refer the reader to 

 the 'Quarterly Journal of Microscopical Science ' for July 1865, in which 

 they were first published. 



I 



