254 BULLETIN OF THE 



Ophiopsila fulva Ltm. 

 Station 155, Montserrat, 88 fathoms. Station 278, Barbados, 69 fathoms. 



Ophiopsila Riisei Ltk. 



Station 285, Barbados, 13-40 fathoms. Station 287, Barbados, 7J-50 

 fathoms. 



Ophioplax Ljungmani Ltm. 



Station 101, Mono Light, 175-250 fathoms. Station 132, Santa Craz, 115 

 fathoms. Station 155, Montserrat, 88 fathoms Station 156, Montserrat, 

 88 fathoms. Station 177, Dominique, 118 fathoms. Station 220, St. Lucia, 

 116 fathoms. Station 232, St. Vincent, 88 fathoms. Station 273, Barba- 

 dos, 103 fathoms. Station 277, Barbados, 106 fathoms. Station 297, Bar- 

 bados, 123 fathoms. Bartlett, Station 10, 18° 13' 20" N., 78° 36' 40" W., 

 103 fathoms. 



Ophiostigma isacanthum Ltm. 

 Station 132, Santa Cruz, 115 fathoms. Station 152, St. Kitts, 122 fathoms. 



Ophiochytra tenuis sp. nov. 



Plate III. Figs. 16-18. 



Special Marks. — Two very large scale-like papilla? at outer end of mouth- 

 angle, and two small ones, within and higher in the slit. A few grains in 

 neighborhood of mouth-shield. 



Description of an Individual. — Diameter of disk 5 mm. Width of arm 

 near disk 1 mm. At outer end of mouth-angle on either side are two large, 

 flat, rounded scale-like papillae, while within and higher on the mouth-frame 

 may be seen two which are minute. At base of mouth-frames, in the centre, 

 is a group of half a dozen grains, covering inner ends of the side mouth-shields, 

 which are long, narrow and bent; wider without than within where they fully 

 join and extend as a sharp angle under the mouth-frames to a level with the 

 second great mouth-papilla. Mouth-shields small, about as long as broad, 

 with a well-marked angle inward ; length to breadth, .5 : .6. First under 

 arm-plate smaller than those beyond, and making a furrow at outer corner of 

 month-slit. The plates just beyond are axe-shaped with a curve without, an 

 angle within, and deep re-entering curves where the tentacles protrude. Bide 

 arm-plates meeting above and nearly bo below ; beyond the disk they are a 

 little Bwollen so at to give, a slightly wavy outline to the arm. Upper arm- 

 plates fan-shaped, with an angle inward. Disk evenly covered with thin 



