144 PANAMIC DEEP SEA ECHINI. 



The tnberculation of one of the anterior lateral ambulacral plates 

 at the ambitus is shown on Plate 71, fig. ^; Fig. 209. 



Station 147, "Challenger" Expedition, December 30, 1873. Lat. 46° 

 16' S.; Long. 48' 27' E., 1600 fathoms. Bottom temperature 0.8 C. 

 Globiurerina ooze. 



EcniNOCREPis A. Aff. 

 Echinocrepis setigera A. Ag. 



Echinocrepifl setigera, A. Ag. Bull. M. C. Z. 1898, XXXII, No. 5, p. 78, Plate XIII. 



Plates 66-69. 



A number of fragments of this species were collected, but only a single 

 fairly complete specimen (Pis. 66; 67) was obtained from Station 3399. 

 It measured 92 mm, in length, 51 mm. in greatest width somewhat pos- 

 teriorly to the bivium ; at the apex, which is also the position of the 

 abactinal junction of the trivium, the test is 52 mm. in height about a third 

 of the length of the test from the anterior extremity. When alive the test 

 is chocolate color, or sometimes deep claret. The primary spines, which 

 are not numerous (Pis. 66, 67), are from 20 to 22 mm. long, of a pinkish 

 color, and stand out prominently against the dark color of the test (PI. 66). 



The posterior edge of the deep fossa is about 23 ram. from the anterior 

 edge of the test, and 20 mm. at its greatest width. 



This species is at once distinguished from E. cuneata A. Ag.^ by the great 

 elongation of the posterior part of the test, the slightest indentation at the 

 ambitus at the junction of the anterior ambulacral areas and of the posterior 

 interambulacral region (PI. 67, figs. 1, j), instead of the deep re-entering 

 angle formed at the same place in E. cuneata? 



The outline of this species is also more rounded (Pis. 66, figs. 1, -2 ; 67, 

 figs. 1, 2, 4, 5), less angular than E. cuneata. The odd anterior ambulacrum 

 is but slightly depressed below the actinal surface (PI. 67, figs. 7, J,). The 

 actinal pouch is entirely on the oral surface (PI. 07, fig. /). The anterior 

 extremity of the test when seen from above is barely indented at the odd 

 ambulacrum (PI. 67, figs, y, Jf), and does not form, as in E. cunrafa, a deep 

 groove passing into the deep angular notch of the anterior extremity, which 



» " Cliallenger" Echinoi.lea, PI. XXVII. 



2 "Challeuger" Echiiioidoa, PI. XXV», figs. 9, 10. 



