180 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Station 40. Granville Bay, 20-30 fathoms. 3 specimens. 

 Station 49. Olriks Bay, upper narrows, 15-20 fathoms. 

 1 specimen. 



Station 51. Robertson Bay, 35-40 fathoms. 6 specimens. 



19. Antedon quadrata Carpenter. 



Antedon quadrata Carpenter, Challenger Report Zool., Vol. XXVI, p. 

 149, 1888. 



Antedon celtica Duncan and Sladen, Memoir Arctic Echinoderms, Lon- 

 don, 1881, p. 75, PI. VI. 



Station 39. Granville Bay, 30-40 fathoms. 3 specimens. 



Station 40. Granville Bay, 20-30 fathoms. 2 specimens. 



Carpenter (L c, supra, pp. 136ff. ) discusses at length the species 

 of Antedon belonging to the Eschrichtl group of Comatulse, and 

 gives a complete synonomy of the two species, eschrichti and 

 quadrata. I find the differences in the material collected by this 

 expedition to be very slight; but there are five specimens from 

 Granville Bay which seem to belong to Carpenter's quadrata. 

 Dr. Ortmann tells me that in life there is a distinct difference in 

 their appearance, but this is less evident in the alcoholic material. 

 The color of quadrata is lighter and the arms have a less feathery 

 appearance, due to the slightly greater length of the arm-joints 

 and the consequently greater distance between the pinnules. The 

 character, however, of quadrata to which Carpenter gives special 

 weight — i. e. , the shorter third pinnule as compared with the second 

 — I cannot find at all well marked, though its joints seem, as Car- 

 penter says, to be slightly longer than those of the same pinnule in 

 escliriclitl. 



According to Carpenter the two species are widely distributed 

 through the Arctic Ocean. Eschrichti reaches, in Smith's Sound, 

 79° N. lat., and quadrata, 81°. 



Both were obtained by the Challenger Expedition as far south 

 as off Halifax, at a depth of 51 fathoms. Eschrichti was found by 

 the " Vega " as far east as long. 92° 20' E. 



In depth eschrichti has been dredged from 632 fathoms, quadrata 

 from 4GG fathoms. 



The Nares Expedition reports both from Discovery Bay, and 

 other localities are, for eschrichti, Davis Strait, Melville Bay, 

 Spitzbergen, and coast of Siberia; for quadrata, Barents Sea and 

 Kara Sea. 



