F. GEOGRAPHY. 209 



a large quantity of line. On the way from Juan Fernandez 

 to Valparaiso, a cast of the lead was taken in lat. 33 33' S., 

 long. 77 2' W. Depth, 1585 fathoms; bottom temperature 

 36 ; fine white globigerina mud. The hauling up of the line 

 took more than six hours, on account of the constant precau- 

 tions needed to prevent it from parting. Further attempts 

 were thereafter given up." 



From Valparaiso the expedition proceeded up the coast, 

 touching at all the principal points, and collecting every 

 where. One of the richest collecting grounds was Parraca 

 Bay, where the fauna was of astonishing richness and variety. 

 The geology was also exceedingly interesting, and the thanks 

 of the explorers are due to Lieutenant Murray Day for a very 

 detailed map of the drift formation in that region. 



From Payta the vessel's course was to the Galapagos, 

 where she arrived on the 10th of June, and remained until 

 the 19th, touching at Charles's Island, Albemarle, St. James's, 

 Jarvis's, and Indefatigable islands. The zoology of these isl- 

 ands was intensely interesting, not only from the peculiar char- 

 acter of the fauna, but also from the physical conditions in 

 which it occurs all these islands being of such recent volcan- 

 ic formation as to preclude the idea of a migration of ani- 

 mals from the main-land, and their subsequent adaptation to 

 new circumstances. The collections at the Galapagos were 

 exceptionally large. Iguanas, both marine and terrestrial 

 (the two species of Amblyrliynchus first made known by Dar- 

 win), fishes, crustaceans, lizards, birds, seals, turtles, besides a 

 great variety of mollusks and radiates. 



From the Galapagos, the Hassled s course was to Panama, 

 where she arrived on the 25 th of June. A detention of three 

 weeks was turned to profitable account by industrious col- 

 lections. The loss of the greater part of the dredging appa- 

 ratus between Juan Fernandez and Valparaiso had, indeed, 

 made dredging in deep waters impossible, but it served as a 

 stimulus to more energetic efforts to collect in shoal waters, 

 along shore, and on land. 



Acapulco, the next port, was reached on the 4th of August. 

 Several days were here consumed in making additional col- 

 lections ; two days also were passed in drawing the seine in 

 Magdalena Bay. From Magdalena Bay the vessel sailed 

 directly to San Diego, which port was reached on the 15th 



