260 HAWAIIAN AND OTHER PACIFIC ECHINI. 



The M. C. Z. collection contains specimens of pictus from San Diego, Gala., 

 and La Paz, and Cape St. Lucas, Lower California. 



The "Albatross" collected it at the following stations: 



Station 2824. Off Espiritu Santo Island, Lower California; 24 22' 30" N., 

 110 19' 30" W. Bott. temp.? 8 fathoms. Brk. sh. 



Station 2825. Off Espiritu Santo Island, Lower California; 24 22' 15" N., 

 110 19' 15" W. Bott. temp.? 7 fathoms. Brk. co. 



Station 2827. Off Espiritu Santo Island, Lower California; 24 11' 45" N., 

 109 55' W. Bott, temp.? 10 fathoms. Sh. 



Station 2828. Off Espiritu Santo Island, Lower California; 24 11' 30" N., 

 109 55' W. Bott, temp.? 10 fathoms. Sh. 



Station 2829. Off Cape St. Lucas, Lower California; 22 52' N., 109 55' W. 

 Bott. temp. 74.1. 31 fathoms. Rky. 



Station 3002. Off San Jose" Island, Lower California; 25 2' 15" N., 110 

 43' 30" W. Bott. temp.? 17 fathoms. S., sh. 



Station 3005. Off San Jose" Island, Lower California; 25 2' 45" N., 110 

 43' 30" W. Bott. temp.? 21 fathoms. S., sh., corln. 



Station 3006. Off San Jose" Island, Lower California; 25 2' 30" N., 110 

 43' 30" W. Bott. temp.? 8 fathoms. Sh., s. 



Bathymetrical range, 7-31 fathoms. 



Thirty-one specimens. 



ECHINUS. 



Linne", 1758. Syst. Nat., ed. 10, p. 663. 

 Type-species, Echinus esculentus Linn6, 1. c. 



This genus as here limited contains seventeen species of which three are now 

 described for the first time. Having already (p. 240) discussed the general inter- 

 relationships of this group, it is not necessary to repeat here the arrangement there 

 outlined. Whether Alexandri is nearest the original stock or not, there can be 

 little doubt that the North Atlantic is the geographical centre of the genus. 

 We find in European waters, besides Alexandri, no less than five species (acutus, 

 elegans, esculentus, melo, tenuispinus) , while in the tropical Atlantic we find 

 four more (atlanticus, gracilis, tylodes, Wallisii). If it is correct to consider 

 affinis as only an extreme and as yet incompletely differentiated form of acutus 

 var. norvegicus, that species extends in deep water along the eastern coast of 

 the American continent at least as far as New Jersey. Of the other species, 

 one (lucidus) is from the coast of Japan, and is nearly related to Alexandri and 



