386 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



their whole length and rounded at the tip, while these are conical 

 and very pointed in O. fluctuans; the radial papillae are also rounded 

 at the tip and not pointed, and the upper arm plates have the lateral 

 angles rounded instead of being sharp as in O. finctuam. 



OPHIURA SARSII Lutken. 



Plate 84, figs. 10, 11. 



See for bibliography : 



Ophiura sarsii GEIEG ('07), p. 15. SUSSBACH and BEECKNER ('11), p. 

 248. H. L. CLARK ('11), p. 37. MORTENSEN ('13), p. 348. MATSUMOTO 

 ('15). H. L. CLARK ('15), p. 323. MATSUMOTO ('17), p. 272, fig. 74. 



Ophioglypha sarsii KCEHLER ('09), p. 155; ('14), p. 23. 



Locality. Hakodate. 



Fifteen specimens (Cat. Nos. 40992, 41163, U.S.N.M.). 

 Notes. These specimens are not of large size, and the diameter of 

 the disk scarcely reaches 15 mm. in the largest. 



HOMALOPHIURA INFLATA (Keehler). 



Plate 84, figs. 2, 3. 



Ophioglypha inflata KCEHLEB ('96), p. 288, pi. 5, figs. 10, 11; ('99), p. 10, 



pi. 11, figs. 83-85. 



Ophioglypha nana LUTKEN and MORTENSEN ('99), p. 126, pi. 2, figs. 1O-12. 

 Ophiura inflata MATSUMOTO ('15), p. 81. 

 Ophiura nana MATSUMOTO ('15), p. 81. 



Homalophiura inflata H. L. CLARK ('15), p. 326. MATSUMOTO ('17). p. 267. 

 Homalophiura nana H. L. CLARK ('15), p. 327. MATSUMOTO ('17), p. 267. 



Locality. Albatross station 5660; Flores Sea; Cape Lassa bearing 

 S. 88 W., 37.99 kilometers (20.5 miles) distant (lat. 5 36' 30" S., 

 long. 120 49' 00" E.) ; 1,266 meters (692 fathoms) ; December 20, 

 1909 ;gy. M., S. 



One specimen (Cat. No. 41165, U.S.N.M.). 



Notes. The single individual measures 4.5 mm. in the diameter 

 of the disk. 



The study which I have been able to make of this species has 

 convinced me that the species of Ophiura, described by Lutken and 

 Mortensen under the name of Ophioglypha nana, is quite identical 

 with my O. inflata, described three years previously; this specific 

 name, therefore, must be used. 



The Albatross specimen is, like all the others known, of very small 

 size, and the diameter of the disk is only 4.5 mm. ; the arms, which 

 are very slender, may reach 15 mm. in length. The plates of the 

 dorsal surface of the disk are more numerous and smaller than in 

 my type, and than in the O. nana described by Lutken and Morten- 

 sen. The upper arm plates are much elongated, very much longer 

 than broad, with the distal border almost straight; the first under 



