276 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



ing on the basal part of the hairs as upon columns. The surface of 

 the primaries thus apparently smooth and shining. Secondary spines 

 flattened, smooth. Small globiferous pedicellariae of the usual gonio- 

 cidarid type, with a large end tooth. Large globiferous pedicellariae 

 unknown. 



Genotype. — Schizocidaris assimilis Mortensen. 



Remarks. — This genus, which was established by the author in the 

 Ingolf Echinoidea 8 was based on the peculiar character of the pedi- 

 cellariae; it was rejected by Doderlein and H. L. Clark, these authors 

 maintaining that the single character of the pedicellariae alone can 

 not justify the establishment of a separate genus. With this argu- 

 ment I quite agree; nevertheless ScJiizocidaris is a perfectly valid 

 genus. The study of the rich material of S. assimilis which I collected 

 at the Kei Islands during the Danish expedition in 1922, together 

 with that collected by the Albatross, has shown that, while the charac- 

 ter of the pedicellariae appears not to hold good for the other species, 

 other much more valuable characters are found which distinguish 

 this group of species from all other goniocidarids, especially the 

 peculiar structure of the primary spines. 



The type of this genus is the species which I named ScJiizocidaris 

 assimilis, found by the Challenger at the Kei Islands (station 192) 

 and referred by A. Agassiz to Goniocidaris jlorigera. To the same 

 genus belongs the species which I designated 9 as Discocidaris (?) ser- 

 rata, not having then observed its close affinity to S. assimilis. The 

 species serrata, which was taken by the Challenger in the Philippine 

 Sea between Mindoro and Luzon (station 204) and likewise referred 

 by A. Agassiz to Goniocidaris florigera, was rediscovered by the Alba- 

 tross. Another species, fasciata, new species, was also found by the 

 Albatross in the Philippines, so that we now know three distinct species 

 of the genus Schizocidaris. 



SCHIZOCIDARIS SERRATA (Mortensen) 



Plate 61, fig. 1; plate 74, figs. 1, 2; plate 78, fig. 1 



Goniocidaris florigera (part) A. Agassiz Challenger Reports, Zoology, vol. 3, 



pt. 9, Echinoidea, 1881, p. 46, pi. 1, figs. 7-11. 

 Discocidaris (?) serrata Mortensen, The Danish higolf-Expcd., vol. 4, pt. 1, 



Echinoidea, 1903, pp. 25, 29, pi. 10, figs. 6, 7. 



Locality. — Station 5415; between Cebu and Bohol; Lauis Point 

 Light bearing N. 24° W., 7.2 miles distant (lat. 10° 07' 50" N., 

 long. 123° 57' 00" E.) ; 161 meters; bottom temperature 16.89° C; 

 fine sand; March 24, 1909 (1 specimen, Cat. No. E. 1375, U.S.N.M.). 



'Part 1, pp. 25, 28, 1903. » Ingolf Echinoidea, pt. 1, pp. 25, 29. 



