MUSEUM OF COMPARATIVE ZOOLOGY. 73 



are long and large, and have from four to six small tentacle-scales on each 

 side. Those a little beyond the disk have only one scale on the inner side 

 and none on the outer. Color in alcohol, white. 

 Station 218, 1070 fathoms, 6 specimens. 



Ophioglypha imbecilis sp. nov. 



Plate III. Figs. C3, G4. 



Special Marks. — Three slender, equally spaced arm-spines. Mouth-shield 

 trefoil, with a long lobe inward. Disk thin, with rather delicate scales. Arms 

 slender. 



Description of an Individual (Station 232). — Diameter of disk 6..') mm. 

 Length of arm 20 mm. Width of arm near disk 1 mm. Mouth-papilloe four 

 or five on each side, square, short, and closely set, with a pointed one at apex 

 of jaw. Mouth-shields trefoil-shaped, with a lobe inward; length to breadth 

 1.5 : 1.5. Side mouth-shields curved, long, and narrow, of nearly even width, 

 and meeting within. First arm-plate triangular, with angle inward, and outer 

 side curved ; second plate, which is largest of all, axe-shaped, with lateral sides 

 re-enteringly cur\'ed ; the rest are triangular, with outer side curved, and 

 diminish constantly in size. Side arm-plates straight and rather delicate, 

 meeting broadly above and below, beyond the second upper arm-plate. 

 Upper arm-plates triangular, with acute angle inward, and outer edge curved. 

 Upper surface of disk covered with irregular, rather thin plates. Radial 

 shields longer than broad ; outer edges curved, meeting broadly without, diverg- 

 ing inward, where they are separated by a smaller and larger plate. On the 

 interbrachial margin of the disk is a large oval plate, broader than long, con- 

 necting the radial shields ; in the centre a circular primary plate, surrounded 

 by numerous others, irregularly shaped. Genital scales long and broad, bear- 

 ing three or four papillae near their outer end. Outside the mouth-shield and 

 between the genital scales are two large semicircular plates, whose outer edges 

 reach the margin of the disk. Three arm-spines, tapering, very delicate, situ- 

 ated half-way up on the side arm-plate, near base of arm ; they are about half 

 as long as a joint. Tentacle-.scales minute and semicircular, two on either side 

 of first two pores ; at the third, two on the outer and one on the inner side ; 

 for the rest only one. Color in alcohol, gray. 



Station 232, 'off Enosima, 340 fathoms, 5 specimens. 



Ophioglypha irrorata sp. nov. 



Plate IV. Figs. 106 - 108. 



Special Marks. — Three very short, small, sharp arm-spines, low down. 

 Mouth-shield wider than long, with a point within. Radial shields long and 

 separated. Papillae of arm-comb close-set, flat, and with rounded ends. 



Description of an Individual (Station 143). — Diameter of disk 8.5 mm. 



