342 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Distribution. — East coast of Mindoro to the Mindanao Sea, 214 to 

 392 fathoms, green mud and ooze; temperature range, 51.4° to 

 54.3° F. 



Specimens examined. — In addition to the type, 13 from the fol- 

 lowing localities : 



Specimens of Anthenoides rugulosus examined. 



station. 



Locality. 



Depth. 



Nature of bot- 

 tom. 



Num 

 ber. 



Bottom 

 temper- 

 ature. 



5198 

 5260 



5501 



5503 

 5527 



5536 



20 miles southeast Malabrigo Light, east coast of Min- 

 doro. 

 10 miles northwest Baliscasag Island, western Bohol .. 

 Off southeastern Mindoro 



8 miles northwest Macabalan Point Light, Mindanao.. 



6.6 miles northwest Macabalan Point Light, Mindanao. 

 Between Siquijor and Bohol Islands 



Between Negros Siquijor Islands 



Fatli- 

 oms. 

 220 



220 

 234 



214 



226 

 392 



279 



Green mud. 



do 



Green mud, 



sand. 

 Fine gray sand 

 and mud 



Green mud 



Globigerina 



ooze. 

 Green mud 



53. 9 

 51.4 



54.3 



5.3.3 

 53.3 



53.5 



Remarks. — This species is readily distinguished from A. granu- 

 losus by its decidedly longer, slenderer rays, narrower supermar- 

 ginal plates, and the uniform, rather close, and finer granulation 

 under the smoothish abactinal membrane. In granulosus the gran- 

 ules of the superomarginal plates are coarse, distributed all over the 

 plate, and show through the membrane, causing the plates to feel 

 rough in alcoholic specimens. In rugulosus the granules are fine, like 

 those of the abactinal plates, and only a few central enlarged gran- 

 ules on the first 5 or 6 plates show through the membrane. As a 

 result the superomarginals (with the exception of the central part 

 of the first few plates) are smooth in undried specimens. The 

 abactinal pedicellariae are forceps-shaped and like those of A. cris- 

 tatus. A characteristic of granulosus is the larger size of the central 

 granules of each abactinal plate ; in rugulosus it is to be emphasized 

 that the granules are subequal. A. llthosorus differs in having the 

 abactinal granules very numerous in the center of disk, becoming 

 smaller and much sparser toward the margin ; in having wider and 

 more tumid superomarginals, which maintain their width to near 

 the end of the ray; in having a coarser actinal granulation, coarsei* 

 superomarginal granules on central part of the proximal plates and 

 much finer, sparser granulation elsewhere; and in having 9 or 10 

 furrow spines. 



Genus ATELORIAS Fisher. 

 Atelorias Fishek, 1911c, p. 424. Type, Atelorias anacanthus Fisher. 



Diagnosis. — Goniasteridae with unequal marginals, the superomar- 

 ginals the larger, conspicuously overhanging the inferomarginals 

 and forming an angular margin to disk and rays; with all the plates 



