66 ADDENDUM TO MEMOIR II. 



On My sis. 



At page 16 of the second Memoir where the gradual 

 developement of the embryo of the Opossum Shrimp is 

 stated, it must be clearly understood that it is not the e^g 

 of which the Author speaks, but the embryo divested of 

 the tunics which envelope the ovum on its first exclusion ; 

 in the other animals of the Crustacea in which an analogous 

 structure to that of the pouch is observable, viz. the aqua- 

 tic Isopodae, it serves merely as a protection to the ova, 

 which hatch all at once, the young as far as we know, 

 coming out quite perfect, as we see in most oviparous 

 animals. 



ERRATA. 



Page 39, line 5. . . . for medusa read medusae. 

 41, " 31,... /"or Godcheu r€?Mrf Godeheu. 

 50, " 12.... /or of read or. 



