260 RECENT OPHIURANS. 



745. 0. BALLII (Thompson). 



Ophioconui ballii Thompson, 1S40. Ann. nat. hist., 5, p. 99. 



Ophiaclis ballii Lutken, 1859. Add. ad hist. Oph., pt. 2, p. 126. Sars, 1861. Ov. Norges Eeh., 

 pi. 2, f. 1-6 (as Atnphiura ballii). 



14 specimens. Sweden: Bohuslan. Norway': Trondhjeim Fjord. 

 France: "Cape Breton" (possibly Bretagne), 28 fms. 



746. O. BRACHYGENYS H. L. Cl.ark, 1911, Bull. 75 U. S. N. M., p. 135, f. 51. 



1 PARATYPB. Japan: Bungo Channel, 437 fms. 



747. 0. CANESCENS (Lyman). 



Amphiura canescens Lyman, 1879. Bull. M. C. Z., 6, p. 30, pi. 12, f. 332-334. 

 Ophiaclis canescens Lutken and Mortensen, 1899. Mem. M. C. Z., 23, p. 143. 



1 coTYPE. North of Kermadec Islands, 600 fms. 



748. O. CANOTIA Lyman, 1879. Bull. M. C. Z., 6, p. 40, pi. 13, f. 3.5.3-355. 



1 COTYPE. Near the Azores, 1000 fms. 



749. O. CARNEA Ljungman, 1867. Ofv. Kongl. Vet.-akad. Forh., 23, p. 324. 



1 specimen. Cape Colony: Simon's Bay, 10-20 fms. 



7.50. 0. CUSPIDATA Lyman, 1879. Bull. M. C. Z., 6, p. 38, pi. 13, f. 359-361. 



2 coTYPES. Near Kermadec Islands, 520 fms. 



751. 0. DELICATA, sp. nov. Plate 11, f. 9, 10.' 



Disk 2 mm. in diameter; arms 6, each about 13 mm. long. Disk covered 

 by coarse flat scales, only 4 or 5 series between center and margin and only 

 2 series, between radial shields across an interradius; near margin, a few scales 

 bear spinelets. Radial shields moderately large, triangular, the outer sides 

 parallel, hence the inner margins diverge, though the shields are in contact 

 distally. Upper arm-plates fan-shaped, or triangular, truncate proximally and 

 with rounded distal corners; more or less in contact throughout. Interbrachial 

 areas below covered with coarse scales, many of which carry, each a small spine- 

 let. Oral shields pentagonal, with rounded corners, about as . broad as long. 

 Adoral plates large, forming a practically complete ring proximal to oral shields 

 and distal to first under arm-plates, but the plates are not actually in close con- 

 tact in every radius and interradius. Oral papillae, two on each jaw, one on the 

 inner end of each adoral plate; it is fan-shaped and relatively large. Lower 

 arm-plates pentagonal, about as long as wide, with distal corners rounded and 



' Without definite locality. 



