394 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The radial shields in 0. familiare are always more rounded and less 

 elongated than in O. elegans. The small radial granules are less 

 numerous and less evident, and I have never seen them elongate into 

 small spines as sometimes occurs in O. elegans. The mouth shields 

 are shorter and smaller in O familiare, and they always have the 

 form which I described and figured in 1896. A last difference, which 

 I did not mention in 1896, is afforded by the tentacle pores which, in 

 O. familiare, are smaller and always covered by a single oval scale, 

 while in 0. elegans, as I have said above, there may be one or two 

 scales on each border, and sometimes there may even be three ; these 

 pores also are appreciably larger in this last species and their size 

 decreases from the first to the third. 



I consider 0. jolliensis, which MacClendon described and figured 

 in 1909 ('09, p. 36) and of which H. L. Clark has given a more de- 

 tailed description and figures (11, p. Ill) also as a species near O. 

 elegans. It may be asked why MacClendon has written " jolliensis '- 

 and not "jollieme; " H. L. Clark has also written "jolliensis" but 

 Matsumoto ('17, p. 291) corrected it and placed the word in the neuter 

 gender. H. L. Clark approximates O. jolliense with O. cancellatum, 

 O. armigerum, and 0. ebumeum, without mentioning 0. elegans and 

 O. familiare, but I find that its affinities with these two last species, 

 and particularly with 0. elegans, are especially close. To judge from 

 H. L. Clark's description and figures, it seems, however, to be distinct ; 

 the radial papillae are more numerous and more developed, the 

 tentacle pores are more reduced and usually provided with a single 

 scale, the arm spines do not exceed three in number, and on a speci- 

 men in which the disk is only 10 mm. in diameter there are only two. 

 The form of the mouth shields in 0. jolliense is quite similar to that 

 which is found in typical O. elegans, as well as in 0. familiare, and 

 H. L. Clark does not mention any variations in their form. 



OPHIOMUSIUM FACETUM, new species. 



Plate 91, figs. 1-5. 



Localities. Albatross station 5114; Balayan Bay and Verde Island 

 Passage; Sombrero Island bearing N. 36 E., 13.34 kilometers (7.2 

 miles) distant (lat. 13 36' 11" N., long. 120 45' 26" E.) ; 622 meters 

 (340 fathoms) ; January 20, 1908; fne. S. 



One specimen (Cat. No. 41371, U.S.N.M.). 



Albatross station 5124; east coast of Mindoro; Point Origon (N.) 

 bearing S. 56 E., 39.45 kilometers (20.75 miles) distant (lat. 12 52' 

 00" N., long. 121 48' 30" E.) ; 513 meters (281 fathoms) ; February 

 2, 1908 ; sf t. gn. M. 



One specimen (Cat. No. 41355, U.S.N.M.). 



Albatross station 5127; Sulu (Jolo) Sea, in the vicinity of south- 

 ern Panay; Nogas Island (W.) bearing N. 11 30' E., '40.77 kilo- 



