THE OPHIURIDiE. 



Ill 



there are no scales, the skin is covered only with granulco. No distinct 

 genital scales. 



Two sharp, pointed arm-spines, at the edge of the arm; the uppermost 

 about as long as a joint, the lower much shorter. The three to four inner 

 tentacle pores with a broad and a small papilla along the distal edge of the 

 pore, those beyond with two rather large scales of the common form at the 

 proximal edge. 



Color in alcohol: gray, the radial shields usually with the margin white. 



Several specimens from Stations 3356, 546 f. ; 3418, 660 f. ; 3424, 676 f. ; 

 3425, 680 f. 



The sole specimen from the latter station has the pores much smaller 

 than usual. The significance of these pores is quite unknown to us ; they 

 would best be examined on sections of the arm, but the specimens are too 

 badly preserved to be used for histological researches. The pores seem not 

 to be covered with skin. In a single specimen of 0, annedcns we have found 

 some few small pores and depressions, corresponding to the pores in 0. 

 2:)olyporus, 







GYMNOPHIURA n. g. 



This genus is closely related to Ophioglyjoha, the sole important difference 

 being that the dorsal side of the disk is covered with a thick naked skin, in 

 or beneath which only a few, if any, iiTegular widely spread scales arc hid- 

 den. In younger specimens these scales may be somewhat more distinct. 

 The outer ends of the radial shields are naked. In all other respects, mouth 

 papillae, teeth, tentacle pores, arm-comb, etc., it closely resembles Ophiogli/plia, 

 As that genus already in its present limitation is rather too wide, it seems to 

 us perfectly justifiable to constitute a new genus on this form. From the 

 genus Ophiopleuraj whose disk is also covered with a thick skin, it is well 



has short genital slits, which do 



not reach the 



separated ; Opiliioplexira 



margin of the disk; there is a complete covering of small distinct scales 



beneath the skin, and there is no arm-comb. 



8. Gymnophiura mollis n. sp. 



Plate VII. Figs. 7-9. 



Diameter of disk, 25 mm. ; width of arms close to disk, 5.5 mm. ; length of 

 arms about five times the diameter of the disk. Five or six mouth papillo3 to 



