534 FOOT AND STROBELL. [Vol. XVII. 



to objection), should be adopted till our knowledge of these 

 structures is more advanced," p. 434. 



Photos 100 and 10.2, PI. XLV. Reproductions of spermato- 

 cytes, first order of Pentatoma. Montgomery (22), Figs. 98- 

 100. These figures show Meves's idiozom substance clearly 

 defined from the rest of the cytoplasm, and a comparison of 

 Photos 1-6, PI. XLI, supports Meves's ((20), p. 143, 144) 

 conclusions as to the homology of this substance to the 

 yolk-nucleus. Photo 103 is a reproduction of Montgomery's 

 Fig. 195, illustrating the persistence of the substance to the 

 metaphase of the first division {cf. Photo 52, PI. XLIII). Many 

 of his figures of PI. V show its continued presence in the 

 spermatocytes, second order. It seems to us that this sub- 

 stance, so clearly shown by Montgomery to persist during 

 these stages, can be homologized to the archoplasm (yolk- 

 nucleus) of Allolobophora. 



Photo 104, PI. XLV. Reproductions of Hermann's (15) 

 Fig. 13. '' Proteus anginneus. Spermatocyt im Ruhestadium 

 mit Archoplasma-kugel." The dense filaments within the 

 archoplasmic mass the author terms " Archoplasmaschleifen," 

 and identifies them with the Nebenkern of some authors, 

 p. 585. 



Photo 99, PI. XLV. Reproduction of Hermann's (16) Fig. 6. 

 Scylliinn catulus — spermatid. This is one of many figures 

 in which is clearly differentiated the author's " Archo- 

 plasmaanhaufung (eine starker granulirte, sich dunkel tin- 

 girende Protoplasmamasse ") {cf. Photos 1-6, PI. XLI). On 

 p. 282 he says: "Technisch ist die Archoplasmaanhaufung 

 gerade in den Selachierspermatiden sehr leicht nachzuwei- 

 sen, vor allem an Material, welches mit Bena'scher Losung 

 fixirt und hierauf einer Doppelfarbung mit Hamatoxylin und 

 Saffranin unterworfen wiirde ; schon bei Anwendung ganz 

 schwacher Systeme (Leitz Obj. 3) wird man das schwarz- 

 gefarbte Archoplasma neben dem rothen Kerne mit aller 

 Deutlichkeit wahrnehmen." 



Photo 95, PI. XLV. Reproduction of part of Calkins's (4) 

 Fig. 9. "Prophase of division" (in Noctilnca miliaris). "The 

 sphere is dividing." Of this sphere Calkins says : " The sphere 



