48 BULLETIN OF THE 



outer part of the under arm-plate ; lengths to that of an arm-joint, .5, .5, .5, .5, 

 .5, .4, .4, .3, .3, .3 : .5. One flat, short, wide tentacle-scale, broader without 

 than within, and, like many of the arm-spines and mouth-papillee, microscopi- 

 cally striated. Color in alcohol, disk, gray ; arms, straw. 

 Station 235, 565 fathoms, 3 specimens in bad condition. 



PECTINUIIA Forbes. 

 Pectinura arenosa sp. nov. 



Plate XIV. Figs. 393-394. 



Special Marks, — Nine to eleven short arm-spines. Disk uniformly granu- 

 lated, with about 8 grains in 1 mm. long. No water-pores between under 

 arm-plates. 



Description of an Individual (Station 162). — Diameter of disk 10 mm. 

 Lemrth of arm about 42 mm. Width of arm close to disk 2 mm. Fifteen 

 short, stout, pointed, crowded mouth-papillae, the three outermost being some- 

 what the widest. Mouth-shields rounded triangular, about as broad as long, 

 with a blunt angle inward and outer side straight. Supplementary shield 

 semicircular, and about two thirds as large as the true shield. Side mouth- 

 shields very small, and short, occupying part of the outer angles of mouth- 

 shield, and widely separated within. First under arm-plate wide and large, 

 and nearly semicircular though the inner side is not quite straight ; those be- 

 yond are as broad as long. There are no water-pores between the plates. 

 Side arm-plates flat and nol swollen, separated above and below. Upper arm- 

 plates short rounded oval ; somewhat broader than long. Disk somewhat 

 angular and slightly swollen, closely covered above and below, except the 

 mouth-shields and side mouth-shields, with a fine granulation, about 8 grains in 

 the length of 1 mm. Genital openings extending from mouth-shield about 

 two thirds the distance to the margin. Nine to eleven short, stout, somewhat 

 flattened peg-like arm-spines, all about half as long as the side arm-plate, except 

 the lowest, which equals it. Two small rounded tentacle-scales on the side 

 arm-plate, whereof that on the interbrachial side overlaps the base of the lowest 

 arm-spines. Color in alcohol, disk pale yellowish brown, above ; arms darker, 

 with irregular belts of black and yellowish brown. 



Station 1 62, 38 fathoms, 6 specimens. This species stands between P. spinosa 

 and P. infernalis. 



Pectinura heros sp. nov. 



Plate XIV. Figs. 389 391. 



Special Marks. — Three very short arm-spines, low down on the side arm- 

 plate. No pores between lower arm-plates. 



Description of an Individual (Station 191). — Diameter of disk 22 mm. 

 Length of arm about 100 mm. Width of arm close to disk without spines 



