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. 



Flli. 191. Pourtai.ksia Jeffrevsi. 



After Loven. 



17 mm. 



Fig. 191". I'. Tanneri. 



The 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 radioles were 

 white. 



17 mm. 



Fig. 192. Pottrtalesia Taxxeri. 



17 mm. 



Fir:. 19:3. PorBTALESTA Taxxeri. 



The proboscis of Pottrtalesia Tanneri (PI. 56, fig. 3) slopes off more gradu- 

 ally from the anal opening than in P. Iw/wmtla, 1 in which it also expands 

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

 ably beyond the subanal fasciole, Fig. 102. 



1 ■•Challenger" Echinoidea, PI. XXII a . figs. 7, 9. 



