222 BULLETIN OF THE 



the upper one partly overlaps the base of the lowest ariu-spine. Color in alco- 

 hol, pale yellow. 



Sigsbee, off Havana, 243 - 450 fathoms, 1 specimen. 



This species differs from 0. Forhcsii in the greater number and length of the 

 arm-spines, and in having two tentacle-scales. 



OphiochcBta (? ) mixta sp. nov. 



Plate II. Figs. 40-42. 



Special Marks. — Disk closely beset with grains, among which, on the upper 

 surface, appear numerous short spikes. Seven arm-spines ; the two xipper 

 ones longest, and as long as three arm-joints. 



Description of an Individual. — Diameter of disk 8 mm. Length of arm 

 about 60 mm. Width of arm without spines 2.3 mm. To each mouth-angle 

 there are fourteen papillae ; the thiee outer being stoutest and flattened, the rest 

 spine-like, with the smallest at the apex. Six short, wide, fiat teeth. Mouth- 

 shields large, triangukft, with a blunt angle within, and outer edge curved ; 

 length to breadth 1.3 : 1.3. The space between the mouth-shield and the 

 mouth-papillae is covered with minute grains, similar to those of the disk. 

 Under arm-plates broader than long, much broader without than within ; 

 outer side curved ; lateral sides re-enteringly curved. The first plate is small, 

 of a transverse oval shape, with lateral corners pointed. Side arm-plates 

 narrow, slightly projecting at their outer edge, meeting below midway on the 

 arm, but separated above by the somewhat swollen upper arm-plates, which 

 are rudely hexagonal, with their inner lateral sides longest Di.sk flat, pen- 

 tagonal, densely covered with small, rounded grains, interspersed above with 

 short spikes of varying length. On removing this granulation, the radial 

 shields are seen to be longer than wide, but quite small, and separated their 

 entire length. Seven long, tapering arm-spines, the five lower being equal, 

 and about as long as two arm-joints, while the two upper are longer. Two 

 large, angular tentacle-scales, whereof the upper one overlaps the base of the 

 lowest arm-spine. Genital opening long and narrow, the scale being quite 

 covered 1)y granulation. Color in alcohol, disk pale olive-green, arms lighter. 



Sigsbee, off Havana, 242 fathoms, 4 specimens. Sigsbee, off Havana, 160 

 fathoms, 5 specimens. Sigsbee, off Havana, 175 fathoms, 5 specimens. 



In the long and more movable arm-spines (not standing on the extreme 

 outer edge of the side arm-plate, nor clinging to the arm) and the diflerently 

 shaped under arm-plates, this species varies from Ophiochceta as defined by 

 Liitken (Addit. ad Hist. Oph. III. pp. 38, 89, 98, 105) ; nevertheless, it may 

 perhaps be placed in that genus without impropriety. 



Ophiothyreus Goesii I^n. 

 Ophiothyrcus Goesii, Of. Kong. Akad. Dr. Goiis Oph. p. 619. 1871. 

 Sigsbee, off Havana, 80 fathoms, 1 specimen. Sigsbee, off Havana, 127 fath- 

 oms, 8 specimens. Sigsbee, off Havana, 175 fathoms, 2 specimens. Sigsbee. 

 off Havana, 242 fathoms, 2 specimens. 



