CLARK: THE CIDA.RIDAE. 213 



series of specimens from Patagonia. The latter so completely yet gradually con- 

 nect the individuals having primaries 2.5 h. d. with those from the Falkland Islands 

 in which the primaries are only .65 h. d., that their identity cannot be doubted. 

 Had Mortensen carefully examined an iuterambulacrum, he probably would not 

 have been misled. Although usually about 25-30 mm. h. d., there are specimens 

 of canaliculata at hand 36 and 39 mm. ; the primaries range from 16 to 63 mm. 

 The color varies from very pale yellowish (with pink necks on the primaries) to 

 very dark brown. This species is apparently confined to the eastern and southern 

 coasts of Patagonia and the neighboring islands. The bathymetric range is from 

 the shore to 600 fathoms. A specimen in the National Museum, which was 

 obviously collected many years ago, is labelled " Navigator Islands." 



Austrocidaris nutrix. 



Cidaris nutrix Wyville Thomson, 1876, Journ. Linn. Soc. London, 13, p. 62. 



Fig. 4, p. 63, Journ. Linn. Soc. London, 13, Wyville Thomson, 1876. 



There can be little question that this species is quite distinct from the preceding. 

 Like it, however, it shows considerable diversity in color and the length of the pri- 

 maries ; some specimens are almost black, with light-colored primaries, while 

 others have the test and secondaries, as well as the primaries, very light colored- 

 Mortensen ( : 03) asserts, without offering any evidence to support his view, that 

 the specimens collected by the " Challenger "at stations 147, 153 and 156 are 

 not this species because the water was too deep at those stations for a shallow 

 water species like nutrix. In view of the fact that a number of echinoderms are 

 known with a very great bathymetric range, we can hardly consider the argu- 

 ment conclusive. The largest specimen of nutrix at hand is only 30 mm. h. d., 

 but the primaries are 66 mm., while a specimen 26 mm. h. d. has primaries only 

 18 mm. This species appears to be confined to Crozet, Heard, and Kerguelen 

 Islands, and the neighboring seas. 



Austrocidaris mortenseni. 



Goniocidaris mortenseni Koehler, 1902, Belgica Eeh. et Oph., p. 6. 



Figs. 1, 11, 17, 29, 30, Belgica Ech., Koehler, 1903. 



It is quite possible that this species does not belong here, but so far as can be 

 judged from the description and figures given it is most nearly allied to the fore- 

 going species. Koehler says nothing about the secondaries, and as the primaries 

 are very long, it is possible that the secondaries are not especially peculiar. The 

 largest specimen was 26 mm. h. d., with primaries 60 mm. The color of the test 

 and secondaries is very dark, while the primaries are reddish. Koehler says there 

 was no indication that the species is " viviparous," but as he only had a single mature 

 specimen, and that possibly a male, further light is needed on this point. The 

 specimens were collected by the " Belgica " in the Southern Ocean, near 70° S. 

 latitude and 87° E. longitude, in depths of 55-330 fths. 



