MUSEUM OF COMPARATIVE ZOOLOGY. 263 



269, St. Vincent, 124 fotboms. Station 272, Barbados, 76 fathoms. Station 

 273, Barbados, 103 fathoms. Station 290, Barbados, 73 fathoms. Station 292, 

 Barbados, 56 fathoms. Station 293, Barbados, 82 fathoms. 



Ophiacantha aspera Ltm. 



Station 100, off Morro Light, 250-400 fathoms. Station 156, Montserrat, 88 

 fathoms. Station 158, Montserrat, 148 fathoms. Station 166, Guadeloupe, 



150 fathoms. Station 171, Guadeloupe, 183 fathoms. Station 219, St. Lucia, 



151 fathoms. Station 240, Grenadines, 164 fathoms. Station 241, Grena- 

 dines, 163 fathoms. Station 249, Grenada, 262 fathoms. Station 269, St. 

 Vincent, 124 fathoms. Station 283, Barbados, 237 fathoms. Station 290, 

 Barbados, 73 fathoms. 



Ophiacantha Troscheli Ltm. 

 Station 269, St. Vincent, 124 fathoms. Station 290, Barbados, 73 fathoms. 



Ophiolebes claviger? Ltm. 

 Station 306, 41° 32' 50" N., 65° 55' W., 524 fathoms. 



Ophiomitra incisa s^. nov. 



Plate VI. Figs. 89, 90. 



Special Marks. — Upper interbrachial spaces indented and covered by a 

 double row of large plates. Radial shields large, scarcely depressed, and nearly 

 or quite joined for their whole length. Two or more tentacle-scales on the 

 first pore. Five slightly thorny arm-spines. 



Description of an Individual (Station 131). — Diameter of disk 10 mm. 

 Length of arm about 80 mm. "Width of arm 3.5 mm. Four or five papillje 

 on each side of a mouth-angle ; the three inner ones being stout spiniform, 

 while the outermost, which is wedged between the side mouth-shield and first 

 under arm-plate, is thick, flattened and more or less curled upward. Mouth- 

 shields of a transverse diamond-shape, with comers so rounded as often to 

 approach an oval; length to breadth, 1.8 : 1.2. They are thick and horizon- 

 tal, so that their border stands out quite sharply from the nearly vertical 

 scaling of the interbrachial space. Side mouth-shields wide and short, not 

 extending beyond the lateral comers of the mouth-shields, widest within, 

 where they fully join. First under arm-plate small, of a diamond-shape with 

 a curve without. The rest are five-sided; widest without, where they are 

 curved, and having re-entering laterals and a very feeble angle within. They 

 are separated by a depressed portion of the side arm-plates, which meet below, 

 but not above, near disk, and form prominent spine-crests on the sides of the 

 arms. Upper arm-plates thick, wider than long, bounded by a gentle curve 



