D. J. SCOURFIELD ON THE WINTER EGG OF A RARE WATER-FLEA. 179 



13. Weismann, a. *' Beitrage zur Naturgeschichte der Daph- 

 noiden," 2. Abhandlung. Zeitschrift f. Wiss. Zoologie, 

 Vol. XXVIII., 1877. 



Explanation of Plate 11. 

 Leydigia acanthocercoides. 



Fig. 1. Female with resting Qgg and proto-ephippium which has 



only been partially moulted, x 85. 

 ,, 2. Anterior portion of boundary line between proto-ephippium 



and unmodified portion of shell, showing the line of 



loosely connected cells, x 300. 

 ,, 3. Lateral view of resting egg and proto-ephippium. x ^o. 

 ,, 4. Front view of the same, x 85. 

 ,, 5. Inner cellular tissue which forms the " packing" between 



the egg and the outer coat of the proto-ephippium. 



x 250. 



