398 BULLETIN" lOO, UNITED STATES NATIONAL MUSEUM. 



grooved spines. Apparently, then, analogus bears much the same 

 relation to coriaceus as speciosus does to leachii. On the other hand, 

 in the form of the ray and the regularity of its plates, analogus re- 

 sembles more nearly leachii. 

 L. glaher and L. callipeplu^ lack pedicellariae and have furrow 



spines without grooves. 



Genus BUNASTER Doderlein. 



Bunaster Doderlein, 1S96, p. 317, pi. 22, figs. la-g. Type, B. ritteri Doder- 

 lein. 



BUNASTER LITHODES Fiaher. 



Plate 95, figs. 8, 8a-h ; plate 124 ; fig. 4. 



Bunaster Uthodes Fishee, Idllb, p. 91. 



Diagnosis. — Very close to B. Htteri in general appearance, but 

 differing in lacking the curious ball-and-socket granules of that 

 form, and in having abundant, low, bivnlved pedicellariae on the 

 papular areas, and a few narrow spatulate tongs-shaped pedicellariae 

 on the abactinal plates ; outer actinal intermediate plates larger than 

 the inner, and subambulacral spines slightly narrower; granules 

 between the naked areas of plates smaller and more numerous. 

 E = 22 mm., r = 5 mm., R = 4.4 r; breadth of ray at base, 6 mm. 



Description. — In the arrangement, form, and surface of plates 

 very similar to typical Bunaster ritteri, but on account of the speci- 

 men being much larger than the type of ritterl, the interniarginal 

 and adradial plates extend farther along the ray, and the second, or 

 outer, actinal intermediate series is lacking only on a trifle less than 

 the terminal third of the ray. The number of plates in each of the 

 marginal and in the radial series has increased. The form of the 

 naked part of the plates is best seen in the photogi'aph. They re- 

 semble, in miniature, irregular boulders set in coarse, pebbly mortar. 

 The surface of the plates, like that described and figiired for ritteri, 

 is rough with regular microscopic bosses which, when viewed under 

 the microscope, remind one very strongly of the compound eye of 

 an insect. These bosses decrease in size toward the middle of the 

 plate, and are found also on the surface of granules. The larger 

 plates also have whitish swellings on the surface, sometimes elongate, 

 sometimes small, roundish, and upward of 5 or 6 in number. Abac- 

 tinally the plates are separated on the oblique transverse sutures by 

 2 or 3 series of granules, and usually by 3 to 5 along the longitudinal. 



Superomarginals 17 or 18 ; inf eromarginals the same ; visible inter- 

 marginals about 13 or 14. A second row of intermarginals consist- 

 ing of about 3 small plat€s is found in the arm-angle ventral to the 

 main series. Both supero-and inferomarginals are oriented as in 

 htteri — obliquely with the actinal end pointing toward the mouth, 



