62 



PAXAMIC DEEP SEA ECHINI. 



The genital openings are large ; their position varies somewhat, though 

 it is generally central. The ocular pores are usually placed close to the 

 terminal ambulacral plates. 



The madreporic body is well defined in both the above-mentioned speci- 

 mens, occupying nearly one half of their respective genital plates. 



In D. globulosiim of 30 mm., Fig. 92, there are eight primary anal plates 

 (PI. 28, fig. Jf) and an outer circle of seven pairs of secondaries. In a speci- 

 men of 25 mm., Fig. 93, there are only seven primary anal plates and an 



mM 



Derm ATO DIADEM A OI.OBILOSIM 



outer circle of eight pairs of secondary plates. 



Both in D. glohuhsiim and D. horrldum the ratio between the actinal 

 system and the diameter of the test seems to change but little with increas- 



Tlie color of the test when alive is of a dark violet with lighter colored 

 primary radioles and still lighter colored, almost pinkish, miliary spines. 



Station 3381, north of Malpelo Isd., 1772 fathoms. Lat. 4' 56' N. ; Long. 

 80" 52' 30" W. Bott. temp. 35°.8. Gn. M. 



Station 3398, off Galera Point, in 1573 fathoms. Lat. 1' 7' N. ; Long. 80' 

 21' W. Bott. temp. 36\ Gn. ooze. 



Bathymetrical range, 1573-1772 lathoms. Temperature range, 36^ 

 to 35.8. 



