384 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



losa. I find this true also of the Japanese form, as well as of N, 

 tuberculata^ N. aegyptiaca^ N. goTnophia, N. frianti^ and N. lemonnieri 

 (to a slight extent). The character is not confined therefore to N. 

 squamulosa^ nor to a few species only. 



This species is readily distinguished from N. squamulosa by the 

 greater regularity of the abactinal plates, and by the absence of the 

 enlarged granules on the papular areas. It may be distinguished 

 from N. semiscriata (von Martems) by the abactinal plates forming 

 regular transverse and longitudinal series. In N. semiseriata the 

 abactinal plates are described as being arranged in quincunx^ with 

 a single papular pore at the corners of the plates. This strongly 

 suggests the genus Narcissia^ in which semiseriata would seem to be- 

 long. 



Type-locality. — Java. 



Distribution. — Java, Palawan, and (including the form japonica) 

 Japan. Sluiter^ (1895, p. 61) records the species from the Moluccas. 



Specimeiis examined. — Station 5357, North Balabac Strait (south 

 end of Palawan), 68 fathoms, coral, sand. 



NARDOA TUBERCULATA Gray. 



Plate 110, fig. 1. 



Nardoa tuberculata Gray, 1840, p. 287; 1866, p. 15.— Sladen, 1889, p. 413.— 



KoEHLEE, 1910rt, p. 157, pi. 17, figs. 1 and 2. 

 OpMdiaster tuberculatus Mulleb and Teoschel, 1842, p. 32. 

 Scytaster tuberculatus Perkier, 1875, p. 157. 



Notes on Philippine specimeiis. — Perrier^ has described this spe- 

 cies and Koehler (1910a, pi. 17, figs. 1 and 2) has already figured it. 

 The only important variation in the Albatross specimens is the pres- 

 ence in 3 examples (starred in the list of specimens) of numerous 

 actinal and abactinal pedicellariae. These resemble large split gran- 

 ules. The abactinal pedicellariae are found on the papular areas and 

 are several times larger than the small granules of the papular areas, 

 and conspicuously larger than the granules on the convexity of the 

 plates (which exceed in size those of the sunken papular areas) . The 

 actinal pedicellariae are also larger than the granules, and are found 

 on the intermarginal papular areas, between the inferomarginal and 

 actinal intermediate plates, and on the single series of actinal inter- 

 mediate plates of the ray. Two small chevrons of actinal interme- 

 diate plates in addition to the complete series are present on the disk. 

 Some of the actinal pedicellariae have 3 jaws 



In the Buton Strait specimen the abactinal plates are considerably 

 less convex than in the Philippine examples and if it is really tuber- 

 culata it is a variety intermediate between sections a^ and a^ of my 



»BiJd. tot de Dlerk. Konink. Zool. Genoot., Afl, 17. 

 «1875, p. 157. 



