260 HAWAIIAN AND OTHER PACIFIC ECHINI. 



The M. C. Z. collection contains specimens of pidus from San Diego, Cala., 

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



The "Albatross" collected it at the follo^Ying stations: — 



Station 2824. Off Espiritu Santo Island, Lower CaUfornia; 2^ 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 CaUfornia; 22° 52' N., 109° 55' W. 

 Bott. temp. 74.1°. 31 fathoms. Rky. 



Station 3002. Off San Jos6 Island, Lower Cahfornia; 25° 2' 15" N., 110° 

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



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

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



Station 3006. Off San Jos^ 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. 



Linn6, 1758. Syst. Nat., ed. 10, p. 663. 

 Type-spccics, Echinus csculetitus 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 Alcxandri 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 Alcxandri, no less than five species {acutiis, 

 clcgans, cscnlc7ilus, mclo, tcnuispiruis), while in the tropical Atlantic we find 

 four more {atlanlicus, (jracilis, tylodcs, Wnllisii). If it is correct to consider 

 aJTuns as only an extreme and as yet incompletely differentiated form of acuius 

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

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

 one {lucidus) is from the coast of Jajian, and is nearly related to Alcxandri and 



