252 BULLETIN OF THE 



Figs. 8, 12, 14) describes radial structures in the cortical portion of the yolk, 

 which are due, in his opinion, to the inward prolongation of the trumpet- shaped 

 cells of the granulosa. 



It is evidently to this latter structure that Schultz ('75, pp. 577, 578, Taf. 

 XXXIV. Figs. 8, 9) alludes when — comj)aring his own observations on the 

 structure of the egg of Torpedo with those of Eimer — he says : " Notwithstand- 

 ing a superficial agreement, a genetically determinable analogy is wanting, inas- 

 much as Eimer derives the protoplasmic streaks in the yolk of the reptilian egg 

 from the penetration of the egg envelopes by the protoplasm of the cells of the 

 granulosa, — a thing which must be absolutely rejected for the egg of Torpedo." 

 The protoplasmic streaks in the egg of the Torpedo occur, according to Schultz, 

 in the peripheral zone of the yolk as a series of wedge-shaped groups of fibres 

 (Strange) which consist of faintly granular protoplasm. The bases of the wedge- 

 shaped groups are directed toward the periphery, and the radial fibres are con- 

 nected with an irregular network which occupies the balance of the peripheral 

 yolk. 



In addition to these observations to which Biitschli has called attention, it 

 may be observed that Leydig ('57, pp. 14, 346) has reported a structure similar 

 to that of the so-called membrane of the germinative vesicle in the nucleus of 

 certain large cells found in the " fat body " of Phryganea and other Arthropods, 

 and does not hesitate to predict that this pore-canal structure may in the future 

 be demonstrated in other cases. 



In Fig. 194 (p. 362, op. cit.) Leydig has represented the secreting cells in the 

 tip of the liver tube of Gammarus as conspicuously radiate in structure about 

 the nucleus as a centre. 



Semper ('57, p. 361, Taf. XVI. Fig. 3) figures large connective tissue cells 

 from the stomach of Lymnseus in which the nuclei are surrounded by a 

 narrow zone of finely granular substance, which is depicted as stretching out 

 in irregular rays. 



KoLLiKER ('57, p. 92), moreover, has observed a radiate structure in the wall 

 of the germinative vesicle in young eggs of Gadus lota, which he thinks may be 

 due to pores. He adds : " Da nun auch der Dotter, so lange er noch feinkornig 

 ist, manchmal wie dusserst fein radidr streijig erscheint, so wird einem der 

 Gedanke nahe gelegt, ob nicht vielleicht der ganze Stoff'wechsel der Eizellen in 

 bestimmten radiaren Bahnen vor sich gehe u. s. w." Compare also Kdlliker, 

 '63, p. 17. 



In the " Parenchymzellen " of Lampyris, Max Schultze ('65, Taf. V. Figs. 

 4, 5) has also figured radiate appearances, similar to those represented by 

 Semper, in the immediate vicinity of the nucleus. 



Oellacher ('72^, pp. 375, 376) has also observed, in the nutritive yolk of the 

 trout's egg hardened in weak chromic acid, canals similar to those described 

 by Reichert which open on the surface of the yolk beneath the vitelline mem- 

 brane. The contents of the canals, of unknown composition, appear trans- 

 parent and colorless. On the broken surface of eggs hardened in more con- 

 centrated acid (2 - 1%) a radial, striate texture is discernible. Both this and 



