i& 



m 



122 



THE OPIIIURIDiE. 



connects the ventral plate with the side arm-plates of the same joint, outside 

 the pore (Fig. 12). Also at the first pore this plate is found, but here it 

 lies proximally to the ventral plate and usually bears the two outermost 

 tentacle scales at the inner side of this pore (not sufficiently clear in Fig- 

 ure 9). This plate is distinct only to about the 10th joint, diminishing in 

 size at the same rate as the pores. Perhaps it is to be looked at as a modi- 

 fied tentacle scale. This plate is found also in Ophioglypha jjlana. 



Color in alcohol : pale gray. 



Younger specimens — (Figs. 9, 10), diameter of disk, 12 mm.; width of 

 arms close to disk, 2.5 mm. — differ from the full grown specimens in not 

 having the scales thick and swollen, but rather flat and small, irregular 

 polygonal or rounded, overlapping. The primary plates are distinct, also a 

 marginal plate; the radial shields are somewhat more elongated, though 

 mainly of the same shape as in other specimens. Mouth papillae almost 

 equally large, only the innermost one on each side pointed. The innermost 

 ventral plates not quite so broadly in contact, nor always so many of them 

 in contact. Besides these no differences of importance are found. 



The numerous specimens vary rather widely, especially in the cover- 

 ing of the disk. There are large specimens with the disk scales perfectly 

 smooth, and there are small specimens with thick swollen scales. The 

 radial shields sometimes only just meet at their outer end. The ventral 

 plates sometimes are separated from the fourth joint in large specimens. 



r 



The arm-spines are often a little longer on the joints in the disk than on 

 those farther out. One specimen (Station 3432) has the arm-spines more 

 developed than usual. 



Stations 3360, 1672 f . ; 3362, 1175 1; 3366, 1067 f . ; 3375, 1201 f . ; 

 3376, 1132 f. ; 3381, 1772 f. ; 3392, 1270 f. ; 3398, 1573 f. ; 3399, 1740 f. ; 

 3400, 1322 f.; 3413, 1360 f.; 3414, 2232 f.; 3432, 1421 f. 



The description of this species somewhat recalls that of 0. grandis 

 Verrill (119) ; but as that species has not been figured it is impossible to say 

 anything more definite about their possible relations. 



^ 



6 



Jl» 



14. Ophioglypha plana n. sp. 



Plato III. Fiprs. 1-4. 



Diameter of disk, 12 mm.; width of arm close to disk 2 mm.; length of 

 arms, c. 60 mm. Five to six short mouth papilla; to each side, the outer- 



<¥ 



^ 



