96 BULLETIN OF THE 



figure. The first arm-pores have three iwinute papilla) on either side ; those 

 beyond have only two long and rounded scales on the inner side of each pore. 

 Color in alcohol, white. 



It will be noted that 0. inermis stands on the limit of Ophioglypha ; while it 

 has the general look and structure of the genus, it lacks wholly the arm-comb, 

 and has only a trace of the papillae along the genital scale below. It seems to 

 go better here than with Ophiodcn. 



Two specimens, (also two young, this species ?) off Tristan d'Acunha, 500 

 fathoms. 



Ophioglypha Deshayesi sp. nov. 



Plate II. Figs. 35-37. 



Special Marks. — Side mouth-shields large and ovoid. Radial shields and 

 primary plates circular and similar. Disk and arm plates thick, swollen, and 

 closely soldered. Mouth-papillaj and scales of mouth- tentacles thick, squarish, 

 irregular, and crowded. 



Description of an Individual (Station 51). — Diameter of disk 18 mm. 

 Length of arm 80 mm. Width of arm close to disk 4 mm. Mouth-papilloe 

 irregular, crowded, angular, closely soldered, five or six on each side and usu- 

 ally one or two at apex of jaw. Mouth-shields small, with long, acute angle 

 inward, and outer edge cleanly curved ; length to breadth 3 : 2. Side mouth- 

 shields large, narrow pear-seed shape, with the romided ends inward, where 

 they meet at one point. Inside the junction of the side mouth-shields is a 

 small diamond-shaped supplementary plate, which makes the apex of an angle. 

 First under arm-plate semicircular or transverse oval, with outer edge nearly 

 straight ; the plates beyond are wide triangular, with a truncated angle in- 

 ward, and outer side a little, curved. Side arm-plates swollen, nearly meeting 

 below within the disk ; separated above by the upper arm-plates, which are 

 broader than long, arched, wider without than within, hexagonal, having outer 

 angles more or less rounded. Disk very thick, covered with rounded plates 

 somewhat obscured by a thick skin ; in the centre above are six large primary 

 plates separated by one or two rows of smaller ones, and in the interbrachial 

 spaces are two larger plates, one marginal and the other inside it. Radial 

 shields very nearly round, separated usually by three plates in a line ; length 

 to breadth .3:3; along their inner margin is a row of small irregular-shaped 

 scales. Genital plates formed of two or more pieces, wider without, tapering 

 inward ; along the outer portion of their free edge is a row of small shapeless 

 pieces, which become more numerous above, and there form a sort of arm- 

 comb. One minute papilla-like arm-spine situated near the junction with 

 the upper arm-plate. Pores of mouth-tentacles enclosed on one side by the 

 two outer nioutli-pajjilla), with some oilier minute ])ieces ; and on the other 

 side by four or five similar parts, which correspond to tentacle-scales : the 

 rest of the pores stand near the lateral corners of the under arm-plates, and 

 have three small peg-like tentacle-scales. Color in alcohol, yellowish-brown 

 or gray. 



