GEOGRAPHICAL DISTRIBUTION OF CRUSTACEA. 1467 



Isocrymes of 56 and 50 F. The temperature at Callao, in July, 

 averages 58 or 59 F. At Iquique, near 20 south, Fitzroy had 

 58 to 60 F., on July 14, 1835 ; and off Copiapo, in the same month, 

 56 i F. At Valparaiso, Captain Wilkes found a sea-temperature of 

 52i F., in May; and Fitzroy, in September, occasionally obtained 

 48 F., but generally 52 to 53. Off Chiloe, Fitzroy found the tem- 

 perature 48 to 51 i in July. 



2. FROM TAHITI TO VALPARAISO. 



* Mean temperature. 



