236 Mr. Lubbock on the 



Genus Daphnia. 



Sp. 10, D. sinnifcra, Gay, Fauna Chilena. 



" Alba, valva spinis minutissimis hirsuta." 



" Head separated from the back by a slight depression, and 

 prolonged in the form of a rounded beak, valves terminated pos- 

 teriorly by large, sharp points, a liitle curved at the apex. The 

 whole surface of the shell covered with little spines, only visible 

 with a microscope." 



San Carlos de Chiloe. 



This species resembles in shape D. mucronata. 



Sp. 11. D. granar'ia, Gay, Fauna Chilena. 



" Alba, valva subtilissime granaria." 



" Head not separated from the back by a depression ; valves 

 shagreened on the whole surface like the elytra of the Elafri; feet 

 of the last pair terminated by one stylet ; external antennas very 

 large." 



Colour white and transparent. 



San Carlos de Chiloe. 



Length 



Width I line. 



Sp. 12. D. Brasiliensis, mihi. 



D. Pul'ici similis. Valvis lasvibus raargine supero regulariter 

 arcuato et pone medium spinifero, postico acuto, infero fere 

 semicirculari. 



Collected by Mr. Darwin in June, 1833. 



Length ^^ inch. 



This species has a slight depression between the head and the 

 body, and a few hairs on the lower posterior margin, as well as 

 above. 



There were three specimens of another species in Mr. Darwin's 

 Collection, but they were so much injured that I did not like to 

 found a new species on them. 



