1868.] lov£n — LESKIA MIRABILIS. 437 



species referred to be rejected from the catalogue, there still 

 remains fifty-four species unrepresented in the Northern States. 

 In connection with the non-occurrence of these plants in the 

 Northern States, their range becomes a subject of considerable 

 ( interest. Speaking generally, some are of semi-arctic and boreal 

 types, and only occur in the more northern or otherwise suitable 

 stations ; others are entirely western in their distribution ; whilst 

 there are a few which are sparingly distributed in the Provinces, 

 or with whose range we have but a limited acquaintance. 

 Ranunculus affinis, Tlialictrum alpinum, Vesicaria arctica, 

 Cochlearia tridactylites, Saxifraga Grcenlandica and 8. nivalis 

 are peculiar to the arctic climate, and, with the exception of the 

 Ranunculus and Cochlearia, are also denizens of the coasts of 

 Greenland. Artnaria arctica, an interesting discovery of which 

 was not long since made at Muskoka Lake, Ontario, by one of 

 Prof. Hincks's students ; Dryas Brummondii, a pretty species in 

 the Gaspe collections of Dr. Bell; Astragalus Labradoricus, 

 Rubus arcticus and Pleurogyne rotata are examples of a less 

 arctic type, though the little Arenaria penetrates the polar 

 regions beyond Whale Sound on the West Greenland coast. 

 Ribes oxyacanthoides is said by Torrey and Gray to occur 

 throughout Canada; and Caltha natans, Aquilegia vulgaris, 

 Linum perenne, Rosa stricta, Matricaria inodora and Elcmgnus 

 argent ea are probably limited to the north western parts of 

 Ontario, and may be looked for in the neighbouring districts of 

 the Northern States. 



ON LESKIA MIRABILIS (GRAY). 



By Prof. S. Loven. 



♦Communicated by Dr. Christian Lutken, Assistant Zoologist in the Museum of 

 the University, Copenhagen. 



This little paper, inserted in the Proceedings of the Royal 

 Swedish Academy for 18G7, well deserves the attention of 

 paleontologists, though its principal aim is to redescribe a little- 

 known recent Sea-Urchin from the Eastern Seas, because this 

 animal throws a peculiar light on certain important points in the 

 morphology of Cystidea. It is, moreover, distinguished by all 

 the ingenuity, accuracy, and profound knowledge which is peculiar 

 to the works of the celebrated Scandinavian zoologist. 



* From the Geological Magazine, vol. v., p. 179. 



Vol. III. B No. 5. 



