514 MEMOIRS OF TR2 NATIONAL ACADEMY OF SCIENCES. 



I'l.ATK XXVI. 



FIG. 9. Sectiou tbrougb segmenting egg of Alpheus saulcyi. Eight cells present. Yolk unseg- 

 inented. Egg membranes diagramatically represented, x 70. 



FIG. 10. Surface view of the same. Sixteen cells present. Yolk pyramids formed. The periph- 

 eral nuclei are seen through a thin layer of yolk. x70. 



FIG. 11. Transverse section through the immature ovaries of Alpheus. Ovary taken in Juno, 

 from female "in berry." Diameter of largest ovarian egg, one one hundred and 

 sixty- eighth of an inch. Diameter of extruded egg, one fiftieth of an inch. Contents 

 of ovarian egg, one thirty-seventh of that of the extruded egg. X-!81. 



FIG. 12. Sectiou through segmenting egg of Alpheus minor, from Beaufort, North Carolina, show- 

 ing uests of nuclei, x 70. 



FIG. 13. Swarm or uest of nuclei, like those of preceding figure. x281. 



FIG. 14. Sectiou through egg of Alnhvm minor, cutting segmentation nucleus. Nucleus elongated, 

 with irregular, indefinite boundary, x 70. 



KKFKRENOK I.KTTKKS. 



.41. ('., a)iment:ir\ canal. 

 B. C., blood cell. 



B. S., blood space (possibly unnaturally distended). 

 i'h., chitinotis egg envelopes. 

 D. A., dorsal aorta. 

 c, e', young ova. 

 F. E., ovarian stroma. 

 F. E.', follicnlar epithelium. 

 /'. C., follicular epithelium. 

 Her., germogeri. 



Her.*, position of germogen in ovary, with i>va nearly ripe. 

 '.'. I"., germinal vesicle. 

 '). H". , ovarian wall. 

 SS, swarm of nuclear bodies. 

 Vac., yolk vacnole. 

 I'it.. vitellogen. 

 x, cell shown in Fig. oO. 

 Y. P., yolk pyramid. 



