'the Echinodermata of the Arctic Expedition. 469 



generalizations invalid. To mention one instance alone. 

 Writing on the results of the ' Porcupine ' dredgings in 1869, 

 which have not yet been published in full, Sir Wyville Thom- 

 son, in his ' Depths of the Sea,' remarks : — Between Scotland 



and Fasroe " we find every one of the Echino- 



derms hitherto found on the coast of Scandinavia and Green- 

 land, with the single exception, I beheve, of Ophioglypha 

 Stuwitzii, a shallow-water Greenland form, among the 

 ophiurids, and of one or two holothurids, which have yet 

 evaded us " {I. c. p. 43). It is tantalizing that Sir Wyville 

 Thomson gives no record of the special Asteroids in his 

 agreeably written narrative. 



Table sliowing the general Geographical Distribution of the vai-ious 

 Species above mentioned; together with an Indication of those ob- 

 tained bij the previous Arctic Explorers, Captains Parry and 

 Penny. 



o, 



Ciicumaria frondosa 



Strongylocentrotus drobacliiensis 

 Asteracanthion groulandiciis . . . . 



polaris 



palseociystallus 



Stichaster albulus 



Crossaster papposus 



Solaster endeca 



f urcifer 



Pteraster militaris 



Opliiog-lypha Sarsii 



robusta 



Stuwitzii 



Opliiocten sericeum 



Ophiopholis bellis 



Amphiura Holbolli 



Opliiacautha spinulosa 



Astropliytou arcticumt 



Antedon Eschricbtii 



celtica 



O 



O 



w 



The following were not obtained by this expedition ; 



Ctenodiscus crispatus. 



Cucumaiia Hyndmani = C. Korenii, Ltk. 



Cliirodota brevis, Huxley, = Myriotrocbus Rinkii, Stp. 



Opliiura giacialis, Forbes. 



t This was dredged by Sir John Ross in 1818. 



