4i6 



BULLETIN OP THE BUREAU OF FISHERIES. 



erable numbers as late as August 15. During the latter half of August very few females 

 with mature ova were taken. Young ranging from 10 to 30 mm. and over in length were 

 present in abundance throughout July and August. 



Eggs. — The mature unfertilized ova (fig. 1 6) are spherical in form and i . i to i .3 mm. 

 in diameter. Their specific gravity is slightly greater than that of sea water and they 



LUCANIA PARVA. 



Fig. 16. — Mature unfertilized egg. X 35. 



Fig. 



. — Egg showing early stage in for- 

 mation of blastodisc (liD). 



are held together in loose clumps by a tangle of coarse adhesive threads. They are very 

 slightly yellowish in color and almost transparent. The egg membrane is relatively 

 thick and homy. A small perivitelline space is apparent but not conspicuous. The 

 micropyle is relatively small. The yolk sphere contains a group of oil globules of 

 unequal size, varying from 12 to 20 in number, which normally rests at the upper pole. 



Fig. i3. — Hiis with blastoderm of 2 cells. 



LUC.\N1A P.\RVA. 



Fig. 19. — Egg with blastoderm of 4 cells. 



Embryology. — The eggs of this species develop in a manner quite typical for teleosts. 

 The course of their development conforms essentially to the course of development as 

 outlined above for the eggs of Cyprinodon variegatus. The embr3'ology of this species 

 will, therefore, be discussed but briefly and with reference to the above discussion of the 

 embryology of the former species. 



