Fisher — New East Indian Starfishes. 31 



Bythiolophus new genus. 



Diagnosis. — In general structure resembling Zoroaster, except in the 

 presence of snperambulacral plates and in the arrangement of the abactinal 

 skeleton. In this the adradial series is more prominent than the carinal, 

 consisting of alternately larger and smaller, transversely elongated plates, 

 the larger of which overlie the lateral third of thecarinals; both sorts 

 strongly overlap the upper end of the superomarginals. Two series of 

 marginals and 4 series of intermediate plates. Adambulacral plates as in 

 Zoroaster. 



Type. — B. acanthinus, new species. 



Bythiolophus acanthinus new species. 



Diagnosis. — Rays 5. R=105 mm., r=13 mm. R=8 r; breadth of ray 

 at base, 1-1 mm. Rays 4 sided, very gradually tapering; abactinal surface 

 of ray sunken, along median line except near tip, where the surface is 

 nearly plane; sides forming a steep bevel; interbrachial arcs angular; 

 radial plates sunken, but tumid, with a short, sharp, appressed spine; 

 adradial plates prominent, forming margin of abactinal surface, larger 

 and smaller alternating, the larger and some of the smaller with a central 

 spine similar to the carinal spines; 6 lateral series of plates, each with a 

 prominent central spine, the third and fourth from top the longest; 

 prominent adambulacral plates with transverse series of 4 spines, and 

 about 3 spinelets (on actinal surface), the inner with 1 to several pedi- 

 cellarite. 



Type.— Cat. No. 37,011, U. S. N. M. 



Type-locality. — Station 5648, Buton Strait, Celebes, 559 fathoms, green 

 mud, bottom temperature, 39.2° Fahr. 



Odinia penichra new species. 



Diagnosis. — Rays 16, rather slender, the costal region extending about 

 half the length of ray and containing 10 to 12 complete, rather weak, 

 conspicuously spiniferous costae, widely and nearly equidistantly spaced ; 

 disk with steeply beveled margin and conspicuous, terminally denticu- 

 late spinelets in ones and twos on its slightly convex plates; adam- 

 bulacral armature with 1 slender aboral furrow spinelet and 1 actinal 

 spine, proximally bifid ; oral plates with 4 or 5 actinostomial spinelets, 

 and 1 aboral furrow spinelet; no suboral spine. R=100 mm., r=7.5 mm. 

 (to edge of disk), R=13.3 r; breadth of ray at base, 3.5 mm. ; breadth 

 of actinostome, 9 mm. 



Type.— Cat. No. 37,019 U. S. N. M. 



Type-locality. — Station 5217, between Burias and Lu^on, 105 fathoms, 

 coarse gray sand. 



Brisinga trachydisca new species. 



Diagnosis. — Rays 13 or 12; a multicostate form with the spinelets of 

 disk in groups of 2 to 6, spaced like pseudopaxillse ; costas 40-45, very 

 prominent, irregular and sinuous, without intercostal bands of pedi- 



