108 



BULLETIN OF THE 



Observations on the Vertical Distribution of Schizopoda. 

 The following species were taken at 



Station. Time. 



March 7. 8.30 p. m. 



Gulf of Panama. 



3409. 7.24 p. m. 



Off Brinloe Isl., Galapagos. 



3412. 9 p. m. 



Off Wenmaii Isl., Galapagos. 



13° 33' 30" N.; 8 p.m. 



97° 57' 30" W. 



About 250 miles S. E. of Acapulco. 



3434. 10.14 a. m. 

 Gulf of California, off Altata. 



3435. 8.56 a. m. 

 Gulf of California, off Carmen Isl. 



the surface : — 







Number of 





Specimens. 



Nyctiphanes australis. 



5 



Euphausia mucronata. 



9 



Euphausia pellucida. 



Many. 



Nyctiphanes australis. 



2 



Euphausia pellucida. 



10 



Euphausia diomedese. 



2 



Euphausia gracilis. 



Many. 



Euphausia mucronata. 



Many. 



Euphausia pellucida. 



Many. 



Euphausia gracilis. 



27^ 



Euphausia mucronata. 



12 



Euphausia pellucida. 



Many. 



Siriella gracilis. 



1 



Euphausia pellucida. 



1 



Nyctiphanes australis. 



8 jun. 



In the first place one observes that all surface catches which contain a con- 

 siderable number of specimens were made at night, that is to say after sunset. 

 The catches at Stations 3434 and 3435, made in the forenoon, contain but few 

 specimens. In all the other catches made in the daytime the Schizopoda 

 are wanting. This fact shows again that the pelagic Schizopoda live at the 

 surface of the sea chiefly in the night, especially the species Nyctiphanes 

 australis, Euphausia mucronata, pellucida, and gracilis. 



Other hauls made between surface and various depths contain the following 

 species taken in the open part of the Tanner net : — 



Depth. Station. 



0-100 fathoms. 3414. 



350 miles S. E. of Acapulco. 



0-175 fathoms. 120 miles N. W. Acapulco. 



0-200 fathoms. Hyd, 2628. 



250 miles from the Galapagos. 



3414. 

 350 miles S. E. of Acapulco. 



Euphausia pellucida. 



Euphausia mucronata. 

 Thysanopoda agassizi. 



Euphausia mucronata. 

 Euphausia pellucida. 

 Euphausia gibboidos. 

 Euphausia gracilis. 

 Nematoscelis microps. 

 Stylocheiron suhmi. 



