192 PANAMIC DEEP SEA ECHINI. 



M. de Meijere calls attention to the great difference in outline of speci- 

 mens of Brissopsis luzbnica. It seems incredible that his figures 1 should 

 belong to the same species. 



Station 3353, off Mariato Point, 695 fathoms. Lat. 7 6' 15" N.j Long. 

 80° 34' W. Bottom temperature, 39°. Gn. m. 



Station 3356, off Mariato Point, in 540 fathoms. Lat. 7° 9' 30" N. ; 

 Long. SI 8' 30" W. Bottom temperature, 40 .1. Sft. bl. in. 



Station 3382, off Point Mala, in 1793 fathoms. Lat. 6° 21' N. ; Long. 

 80° 41' W. Bottom temperature, 35 .8. Gn. m. 



Station 3394, Panama Bay, in 511 fathoms. Lat. 7° 21' N. ; Long. 79° 

 35' W. Bottom temperature, 4P.S. Dk. gn. m. 



Bathymetrical range, 511-1793 fathoms. Temperature range, 41.8- 

 35.8. 



Toxobhisstts, Des. 

 Toxobrissus pacificus A. Ag. 

 Toxobrissus pacificus A. Ag., Bull. M. C. Z. 1898, XXXII, No. 5, p. 83, Plate XI, figs. -1, 5. 

 - Plates 103, figs. 3, ', ; 105, figs. k-6. 



Confronted with the same difficulties in determining the Pacific species 

 of Brissopsis as was the case with the West Indian types, 1 am inclined to 

 refer to the genus Toxobrissus of Desor a number of specimens allied to 

 Brissopsis columbaris dredged off Point Mala at Stations 3355 in 182 fathoms 

 and 3357 in 782 fathoms. 



This species is marked for the flatness of the test, the confluence of the 

 posterior lateral ambulacra along the median line for nearly half their 

 length, Fig. 279 (Pis. 103, fig. 4; 105, fig. 5), the width of the posterior 

 extremity of the test, the narrow and uniform size of the bare posterior 

 ambulacral plates on the actinal side of the test (Pi. 105, fig. j), and the 

 small size of the actinal plastron (PI. 103, lig. ./), the small size of the anal 

 system (PI. 105, fig. 6), with an outer row of large rectangular plates, 

 and the elongated subanal fasciole, broad under the anus and gradually 

 becoming narrower at the actinal loop. 



The apical system (PI. 105, fig. 5) has four large genital pores. Fig. 279; 

 the right anterior genital plate, separating the posterior genital from the 

 left genitals, extends as a madreporic plate far into the odd interambu- 



1 "Siboga " Ecbinoidea, PI. XXIII, figs. 469, 470. 



