ECHINOCREPIS SETIGERA. 147 



The anal system is slightly pyriform (PI. 68, fig. 3) ; it is covered by five 

 or six concentric rows of small irregularly shaped polygonal plates with a 

 subcentral anal opening, Fig. 177. The outer row of plates are larger and 

 carry miliaries. 



The actinal system is pyriform, truncated at the posterior extremity (PI. 

 69, fig. /). The actinal membrane is flexible, bordered only on the edges with 

 a row of larger elongate plates on one side, broken into two or three rows of 

 much smaller plates on the other side. There are no primordial plates and 

 no labium to be seen, Fig. 165, unless the small plates facing the anterior 

 lateral ambulacra are to be considered as such. As in Pourtalesia the whole 

 width of the posterior lateral interambulacra separates the bivium from 

 the trivium (Pis. 67, fig. 1 ; 68, fig. 1). The sternum is separated from 

 the actinal pair of the posterior ambulacra, by the whole width of these 

 interambulacra as well as by the actinal plates of the anterior lateral 

 ambulacra and the antisternal plates of the posterior ambulacrum (PI. 67, 

 fig. 1; 68, fig. 1- 69, figs. 7, .7). 



The primary radioles are long, slender, pointed, slightly curved (PI. 66); 

 they are longer upon the abactinal side (PI. 66 figs. .', 3) than upon the 

 actinal side, where they are also less curved, or quite straight. The small, 

 slender, and short miliary spines resemble the primaries in every respect 

 except size. 



The arrangement of the actinal plates of Echinocrepis euneata, Fig. 166, 

 is, according to Loven, 1 much like that of Spatagocystis Challengeri, with two 

 long slender plates in the lateral posterior ambulacra, and a pointed labium 

 excluded from the actinal system. 



Some of the pedicellaria* are brilliant glassy heads standing out like 

 miniature spheres on the dark test. 



Station 3398, fragments, off Galera Point, 1573 fathoms. Lat. 1 7' N. ; 

 Long. 80° 21' W. Bottom temperature. 36 . (in. ooze. 



Station 3399, one specimen off Galera Point, 1740 fathoms. Lat. 1° 7' 

 N. ; Long. 81° 4' W. Bottom temperature, 36. Gn. ooze. 



Station 3415, many fragments, off Acapulco, in 1879 fathoms. Lat. 14° 

 46' N. ; Long. 98° 40' W. Bottom temperature, 36°. Br. m. glob. ooze. 



Bathymetrical range, 1573-1879 fathoms. Temperature range, 36°. 



1 Pourtalesia, PI. VII, tig. 53. 



