54 ON THE ECHINODERMATA OF THE 



OPHIUROIDEA. 



THE Ophiuroidea collected in Smith's Sound, in Discovery Bay, near Cape Frazer, 

 Hayes Point, and Franklin-Pierce Bay, and in some other localities in those high lati- 

 tudes, were numerous in individuals, but the number of genera and species was restricted. 

 Some specimens were collected in Baffin's Bay, but so far to the south (lat. 65 N.) that 

 their consideration hardly comes within the scope of this monograph ; they will, 

 however, be noticed briefly. 



All the Ophiuroidea of Smith's Sound and to the north belong, with one exception, 

 to well-known genera and species ; and it is interesting that a comparatively new genus 

 should be represented by a well-marked species and large individuals. 



List of the Species. 



1. Ophiopleura arctica, Duncan. Discovery Bay, 25 fathoms. 



2. Ophioglypha Sarsii, Liitken. Floeberg Beach, 10 fathoms ; Discovery Bay, 



25 fathoms; Hayes Point, 35 fathoms. 



3. Ophioglypha robusta, Ayres. Discovery Bay, 25 fathoms ; Richardson Bay, 



70 fathoms; Hayes Point, 35 fathoms; Franklin-Pierce Bay, 15 fathoms. 



4. Ophiocten sericeum, Forbes. The same, with the omission of Richardson Bay. 



5. Amphiura Holbolli, Liitken. Franklin-Pierce Bay, 15 fathoms. 



6. Ophiacantha spimdosa, Miiller & Troschel. Discovery Bay, 25 fathoms ; Cape 



Frazer, 80 fathoms ; Franklin-Pierce Bay, 15 fathoms. 



7. Astrophyton Agassizii, Stimpson. Latitude 78 19' N. ; depth 600 fathoms. 



Species found to the South. 



8. Ophioglypha Stuwitzii, Liitken. Latitude 65 N., 26 miles off the coast of 



Greenland ; depth 60 fathoms. 



9. Ophiopholis bellis, Linck. In the same place. 



The temperature of the water whence the six species from the higher latitudes 

 were dredged was 29-5 Fahr. 



Genus OPHIOPLEURA, Danielssen & Koren. 



LiltJcenia, Duncan. 



This genus was determined by MM. Danielssen and Koren in 1867, and the 

 diagnosis was published in the ' Nyt Magazin for Naturvidenskaberne,' Christiania. 

 The specimens were obtained in the Norske Nordhavsexpedition, whose Echinodermata 

 were placed in the hands of those distinguished naturalists. Before this description 

 came to hand, the genus Lutkenia had been described, in order to include a species 



