1^6 BULLETIN OF THE 



OPHIOCAMAX gen. nov. 

 Ophioeamax vitrea sp. nov. 



Plate Vm. Figs. 318-231; Plate IX. Figs. 343-244 (Toong). 



Special Marks. — Mouth-papillaj numerous, spine-like, arranged in a tuft. 

 Tentacle-scales blunt spiniforra, two or three to each pore. Disk covered 

 above with rounded, equal, thin scales set thickly •with minute thorns and 

 crochets. 



Description of an Individual (Station 219). — Diameter of disk 17 mm. 

 Width of arm without spines 4.4 mm. About thirty long, spiniform, equal 

 papillEB to each angle, set in two or three ranks ; of which half a dozen 

 are arranged imder the teeth, and may be considered tooth-papillae ; and 

 three on either side are- borne on a small plate or scale, at outer comer 

 of mouth-slit, and cover the second mouth-tentacle. Seven broad flat 

 teeth, with a rounded cutting edge. Mouth-shields small, broader than 

 long, with an obtuse angle within and a truncated angle without, bearing 

 a few short spines; length to breadth 1.5 : 2. Side mouth-shields exception- 

 ally large and wide, meeting broadly within, having their inner sides gently 

 curved. Under arm-plates with a wide, slightly curved, somewhat swollen 

 outer edge, and a narrow projection within, where they join the next plates; 

 on each lateral side a sharp re-entering curve, where the tentacle issues ; 

 length to breadth 2 : 2.6. Side arm-plates near base of arm not meeting 

 below and scarcely above ; forming broad, abrupt, but not very high ridges. 

 Upper arm-plates slightly swollen, about as broad as long, with a gentle 

 curve without and a deep curve within. The whole arm is sparsely set with 

 minute points. Disk flat and even, closely set with fine short spines which are 

 sharp and thorny or forked. Radial shields flat and regular, triangular, with 

 an angle inward, bearing a few spines like those of the disk, and separated 

 by a row of the same ; length to breadth 4 : 2.5. Near base of arm nine 

 slender, slightly flattened, glassy arm-spines, whereof the three lowest are very 

 small. Unlike those of Ophiacantlm, these spines are not hollow. Lengths to 

 that of an arm-joint 3, 3, 3.6, 4, 3, 1.6, 1.2, .8, .6 : 2. Three stout, club-shaped, 

 spiniform tentacle-scales on the first pore, and usually two on those immediately 

 beyond. Color in alcohol, straw. 



A younger specimen (Station 192, PI. IX. Figs. 242-244), with a disk of 

 12 mm., had the upper arm-plates longer ; the basal under arm-plates did not 

 touch each other ; the scaling of the disk was distinctly marked ; there were 

 three tentacle-scales on the basal ]>ores ; the arm -spines were seven ; lengths 

 to that of an arm-joint 2.2, 4.4, 3, 2.2, 2, 1.5, 1.2 : 1.5. 



Station 192, 129 fathoms, 1 specimen and young. Station 201, 102 fath- 

 oms, 1 specimen. Station 204, 100 fathoms, 1 specimen. Station 219, 152 

 fathoms, 2 specimens. 



