336 Verrill, Notes on Radiata. 



List of species from the Southern extremity of South America^ and 

 the neighboring Islands. 



ASTEEIOIDEA. 



Ganeria Falhlandica Gray, Falkland Islands. 

 Asterias antarctica (Liitk. sp.), Straits of Magellan. 

 Asterias rugispina Stimp., Orange Harbor, Terra del Fiiego. 



ECHINOIDEA. 



Echinocidaris Scythei Phil., Straits of Magellan. 



Echimis Magellanicus Phil., Straits of Magellan. 



Abatus australis (Phil, sp.) Trosch., South America, Statten Land. 



A. cavernosus (Phil, sp.) Trosch., Statten Land. 



A. antarcticus (Gray sp.) Liitk., South Polar Seas. 



Tripylus excavatus Phil, Southern extremity of South America. 



[?) T. Philippii Gray, South America. 



HOLOTHUEIOIDEA. 



Lejndopsolus? antarcticus [Cuvieria antarctica Phil.), Straits of Magellan. 



An analysis of the preceding lists shows that the distribution 

 of Echinoderms on the West coast of America agrees very nearly 

 with that of the Crustacea, as determined by Prof. Dana ;* with that 

 of Mollusca, as elucidated by Carpenter ;f and with the general facts 

 determined for the Fishes, Mollusca and Radiata by Forbes.J But 

 at the same time there are some disagreements in subordinate points 

 which demand attention, and additional evidences are obtained, con- 

 cerning the actual limits of the several faunce. 



The comparatively small number of species of Echinoderms and 

 the definiteness of their characters, except among Holothurians, ren- 

 ders this class well adapted to illustrate the faunal divisions, while 

 the localities for the species described from these coasts are generally 

 more authentic than in many other regions. 



The faunal divisions, indicated by the information already in our 

 possession, are as follows : 



The Sitchian Province. — This fauna was believed by Forbes to 

 extend southward to Oregon, including Puget Sound, while by Dana 

 the latter region was named as a distinct region, the Pugettian Prov- 

 ince. The Echinoderms now known indicate that in this class Puget 

 Sound agrees nearly with the fauna of Oregon. The limits of the 

 Sitchian fauna are not yet known. To the north it appears to pass 

 into the Arctic, or Circumpolar Fauna, while several of the arctic 



* Report upon the Crustacea of the U. S. Eipl. Exp., by J. D. Dana, 1862. 



f Report of the British Association, 1856. 



X Johnston's Physical Atlas, p. 99, PI. 31, 1856. 



