134 



PANAMIC DEEP SEA ECHINI. 



invagination to a process similar to that forming the deep sunken ambulacra 

 in Moira, between them and the flush or slightly sunken ambulacra we 

 find nearly all stages of intermediate depression, or to the formation of 

 the slight groove of the odd anterior ambulacrum in so many Spatangoids, 

 without of course hinting at a genetic connection between the two. 



Fig. 191. 



PoURTAI>ESIA JeFFREYSI. 



After Lov6n. 



17 imii. 



Fig. 191 ^ T'. Tanneri. 



Tiie color of the test when brought up in the trawl was bright pink, with 

 a violet tinge round the base of the primary tubercles ; the radioies were 

 white. 



17 mm. 



Fig. 192. Poxjrtalesia Tanneri. 



17 mm. 



Fig. 193. Pourtalesia Taxxxrl 



The proboscis of Pourtalesia Tanneri (PI. 56, fig. 8) slopes off more gradu- 

 ally from the anal opening than in P. Jaguncula,^ in which it also expands 

 laterally, while in P. Tanneri it is somewhat pointed and projects consider- 

 ably beyond the subanal fasciole, Fig. 192. 



» " Challenger " Echinoidea, PI. XXII ■. figs. 7, 9. 



