CHAP, ix.] THE DEEP-SEA FAUNA. 451.) 



tus, Psammechinus miUaris, Echinocyamus angidatus, 

 Ainpliidetus cordalus, and Spatangus purpureus may 

 be regarded as denizens of moderate depths in the 

 ' Celtic province,' recent observations having merely 

 shown that they have a somewhat greater range in 

 depth than was previously supposed. Probably Srja- 

 langus raschi may be an essentially deep-w^ater form 

 having its head-quarters in the same region. Seven 

 species Cldaris papillata, Echinus elegans, E. nor- 

 vegicus, E. rarispina, E. microstoma, Brissopsis lyri- 

 fera, and Tripylus fragilis are members of a fauna 

 of intermediate depth ; and all, with the doubtful ex 

 ample of Echinus microsloma, have been observed in 

 comparatively shallow w r ater off the coasts of Scan 

 dinavia. Five species Cidaris affinis, Echinus melo, 

 Toxopneustes Lrevispinosus, Psammechinus micro- 

 t iiber culatus, and Schizaster canaliferus are recog 

 nized members of the Lusitanian and Mediterranean 

 faunae ; and seven Porocidar-is purpurata, Plior- 

 mosoma placenta, Calveria hystrix, C. fenestrata, 

 Neolampas rostellatus, Pourtalesia jcffrcysi, and P. 

 phiale are forms which have been for the first time 

 brought to light during the late deep-sea dredging 

 operations, whether on this or on the other side of 

 the Atlantic. There seems little doubt that these 

 must be referred to the abyssal fauna, upon whose 

 confines we are now only beginning to encroach. 

 Three of the most remarkable generic forms Cal 

 veria, Neolampas, and Pourtalesia have been found 

 by Alexander Agassiz among the results of the deep 

 dredging operations of Count Pourtales in the Strait 

 of Florida, showing a wide lateral distribution, while 

 even a deeper interest attaches to the fact that 



