178 



PANAMIC DEEP SEA ECHINI. 



fig. /). When examined from the interior of the test, the genital openings 

 are seen to be deeply sunken in the thick central plate. 



The primary spines (PI. Go, figs. 8-11) are quite flattened, covered with 

 coarse serrations on the edge, and have a sharp terminal spine. 



Station 3363, northeast of Cocos Island, in 078 fathoms. Lat. 5° 43' N. ; 

 Long, 85" 50' W. Bottom temperature, 37 .5. Wh. glob. ooze. 



Station 3365, northeast of Cocos Island, in 1010 fathoms. Lat. 5 31' N.; 

 Long. 86 31' W. Bottom temperature, 37". Y. glob. ooze. 



Station 3376, south of Malpelo, in 1132 fathoms. Lat. 3 9' N. ; Long. 

 82 8' W. Bottom temperature, 36.3. Gy. glob. ooze. 



Bathymetrical range, 978-1132 fathoms. Temperature range, 37 .5-36 .3. 



Paleopneustes A. Ag. and Linopneustes A. Ag. 

 Pis. 92-97. 



The genus Amphipneustes has been established by Koehler 1 for a Spatan- 

 goid collected by the " Belgica " in Lat. 70° 33' S., Long. 89° 22' W., in 600 



5 

 110 mm. 



Fig. 260. Linopneistes longispixi ~. 



140 mm. 



Fig. 261. Paleopxeustes cristatus. 



metres. It is allied to Paleopneustes and Linopneustes, but is marked for 

 its anterior ambulacrum flush with the test, with pores like those of the 

 lateral ambulacra, and a tendency in the lateral ambulacra to become peta- 

 loid even more than in Linopneustes Murrayi and L. longispimis (PI. 93, 

 fig. 1). In the apical system there are four distinct genital plates, the 

 madreporic plate does not extend into the median interambulacral area as 

 in Schizaster or Linopneustes, Fig. 260, and Paleopneustes, Figs. 261, 262, in 

 both of which also the right anterior genital forms a single plate with the 

 madreporic plate (Pis. 93, fig. 1 ; 94, fig. 7; 96, fig. 3; 97, fig. 2), but in 



1 Resultats du Voyage du S. Y. Belgica. Zoologie, 1902. Echinides et Ophiures, par R. Koehler, 

 p. 11, PI. VI, figs. 42, 43. 



