74 BULLETIN OF THE 



Width of arm close to disk, witliout spines, 1.7 mm. Six square, close-set 

 mouth-papilla5 on each side, and one large diamond-shaped at apex of jaw. 

 Mouth-shield much broader than long, -with outer edge much rounded and 

 an obtuse angle inward ; length to breadth 1.7 : 2. Side mouth-shields long 

 and narrow, just meeting within and with a swelling at the outer end. 

 First under arm-plate triangular, transverse oval, or wide rounded hexag- 

 onal ; second plate pentagonal, with inner angle truncated, outer edge 

 rounded and wider than inner one, lateral sides re-enteringly curved ; be- 

 yond this they are rounded triangular, with a broad curve without, and a 

 peak inward. Side arm-plates wide, flat, even ; meeting broadly below, beyond 

 third plate separated above by the upper arm-plates, which are four-sided, with 

 inner side shorter than outer, which is curved. Disk flat and thin, covered 

 with fine, closely overlapping scales ; there are six large round primary plates, 

 one in the centre and one to each brachial space, widely separated by the disk- 

 scales ; on the surface of the disk are a few scattered, very minute spines. Ea- 

 dial shields irregular rhomboidal, broad without and with a blunt angle 

 inward, separated their entire length by a wedge of larger and smaller disk- 

 scales ; length to breadth 2 : 1. Interbrachial surface on the under side covered 

 with the same fine overlapping scales as above. Genital scales small, narrow 

 within, widening a little without as they appear above the disk. Along their 

 free edge, which extends from outer edge of mouth-shield to margin of disk, 

 there is a close row of minute, squarish, tooth-like papillae, which become short 

 and rounded on the arm-comb. Three small pointed arm-spines, situated low 

 on the edge of the side arm-plate close to tentacle-scales. On the pores of the 

 mouth-tentacles five large rounded scales similar to mouth-papillse, on either 

 side ; on the second set six on the interbrachial side and four on the brachial ; 

 immediately beyond the disk there are only one or two on the inner and none 

 on the outer side. Color in alcohol, Avhite, 



Station 143, 1900 fathoms, 1 specimen. Station 164, (young of this species ?) 

 410 fathoms, 6 specimens. 



Ophioglypha orbiculata sp. nov. 



Plate IV. Figs. 103- 105. 



Special Maries. — Three very short, small, sharp arm-spines, low do-rni. 

 Mouth-shield as broad as long. Radial shields short, rounded, and separated 

 by the fine scaling of the disk. Papilla) of arm-comb close-set, Hat, and with 

 rounded ends. 



Description of an Individual (Station 237). — Diameter of disk 15.5 mm. 

 Width of arm close to disk 2.7 mm. Six or seven mouth-papilla) on each side, 

 small, irregular, and tooth-like, with three longer and more pointed at apex of 

 jaw. Mouth-shield broader than long, five-sided, having a Inroad angle within, 

 with outer lateral corners rounded ; length to breadth 2.5 : 2.3. Side mouth- 

 shields, following inner angle of mouth-shield, narrow, pointed without, and 



