202 HAWAIIAN AND OTHER PACIFIC ECHINI. 



absent on the West African coast appearing again in South African waters. 

 Bathymetrically it occurs out to about the 200-fathom line. As Mortensen has 

 shown, there are no authentic records, for the American coast or the W 7 est 

 Indies. 



Brissopsis alta. 



Mortensen, 1907. Ixgolf Ech., pt. 2, p. 159. 



Dr. Mortensen does not refer to the possibility that this is a hybrid but it 

 seems there is some basis for suspecting it. All of the forty-seven specimens 

 in the M. C. Z. collection are from Blake Station 49, the type locality for Hypse- 

 laster limicolus, and all other known specimens are from stations where limicolus 

 also was taken. This fact seems significant. 



Brissopsis columbaris. 



A. Agassiz, 1898. Bull. M. C. Z., 32, p. 82. 



The range of this species was known hitherto as from the northern side 

 of the Gulf of Panama to the vicinity of Cape St. Lucas, Lower California, at 

 depths of 491-1793 fms. The following stations extend the range southward 

 and into shallower water. 



Station 2792. Off Cape San Lorenzo, Ecuador. Bott. temp., 42.9°. 

 401 fms. Gn. m. 



Station 2793. Off Cape San Francisco, Ecuador. Bott. temp. 38.4°. 

 741 fms. Gn. m. 



Station 4631. Off Mariato Point, Panama. Bott. temp. 38°. 774 fms. 

 Gn. s. 



Bathymetrical range, 401-774 fms. Extremes of temperature, 42.9°-38°. 



Twenty-eight specimens. 



Brissopsis parallela. 



Koehler, 1914. Ech. Indian Mus. Spat., p. 213. 



So far as the material permits of a decision, this Beems like n well-marked 

 species, but. it is known from only four specimens, three fragmentary, from 

 four stations in the eastern part of the Bay of Bengal in 185-705 fms., a region 

 in which luzonica is well known to occur. Its relation to that species still 

 needs elucidation. 



