1901.] NATURAL SCfENCES OF PHILADELPHIA. 181 



Of these nineteen species it will be observed that two, Asterias 

 polaris and Ophiopholk aculeata, are not strictly to be reckoned 

 with the others as they were collected in more southern stations — 

 the former off the coast of Labrador and off Disco, the latter in 

 Battle Harbor, Labrador. The other species are all from between 

 lat. 76° and 79° N., though some species were also found at the 

 more southern stations. 



The Arctic Echinoderm fauna has been examined with care, 

 and it was hardly to be expected that any new species would be 

 added to the list of those already known. It is interesting, how- 

 ever, to note at least a new distribution, for Asterias gunneri. has 

 before this, I believe, never been recorded from Greenland waters. 



A comparison is naturally suggested between this list and that of 

 the collection made by Capt. Nares, of the ' ' Alert ' ' and ' ' Dis- 

 covery, " in 1875-6 from the same region, and published by Dun- 

 can and Sladen in the Annals of Natural History (IV), Vol. XX, 

 1877. 



We have in addition to that list one Holothurid, M. rinkii, and 

 two Asterids, Asterias gunneri and Cribrella oculata ; while in the 

 Princeton collection Asteracanthion (^Pedicellaster) palmocrystallus, 

 Solaster forcifer, Ophioglypha struivitzii and Astrophyton ardicum 

 (a deep-water form) of the Nares collection are not represented. 



Of the nineteen species in the Princeton collection, all but Aste- 

 rias polaris are more or less widely distributed in both American 

 and European Arctic seas. 



Increased knowledge of the distribution of Arctic Echinoderms 

 seems to increase the probability that they are nearly all circum- 

 polar and not confined to local areas. 



