REPORT ON THE OPHIUROIDEA. 59 



(Type specimen from Station 241.) Diameter of disk 12 mm. Length of arm 30 mm. 

 Width of arm close to disk, without spines, 3 mm. Mouth papillae small, conical, four to six 

 on each side, and three larger at angle of jaw. Mouth shield large, much longer than wide, 

 five-sided, with an angle inward, and outer edge, which is wider than inner, much curved ; 

 length to breadth 4 : 3*5. Side mouth shields short, wider within than without, meeting 

 broadly and occupying only the inner angle of the mouth shield. First under arm plate 

 three-sided, with truncated angles ; beyond they are nearly square, with truncated 

 corners and their lateral sides re-enteringly curved ; those farther out are octagonal, and 

 afterwards hexagonal. Side arm plates thick, swollen, meeting neither above nor below, 

 except at end of arm. Upper arm plates much broader than long, hexagonal, arched. 

 Disk thick, covered above by a few stout plates. Eadial shields angular, pear-seed shape, 

 somewhat sunken, joined without but diverging inward, where they are separated by a 

 thick wedge-like scale ; length to breadth 3 : 2. In the interbrachial spaces are five 

 large plates, two on margin of disk, connecting the outer ends of the genital scales ; one 

 quadrangular, connecting the radial shields ; and two smaller, which lie between inner 

 ends of radial shields. The central space is covered by six regular, stout primary plates, 

 elevated above the rest, the central one pentagonal, the others hexagonal. The genital 

 scales fill the lower interbrachial space between mouth shield and arm, and bear on their 

 free edge a close row of square papillae, which become peg-like on the arm comb. Beyond 

 the mouth shield is a row of three small rounded marginal plates. Three short, delicate, 

 tapering arm spines, equally spaced. Tentacle pores within the disk have two or three 

 scales on the inner side, and one or more on the outer. Colour in alcohol, yellowish- 

 grey. 



Station 241.— June 23, 1875; lat. 35° 41' N., long. 157° 42' E. ; 2300 fathoms; 

 (young) ; red clay. Station 246.— July 2, 1875 ; lat. 36° 10' N., long. 178° 0' E. ; 2050 

 fathoms; grey ooze. Station 846.— April 6, 1876; lat. 2° 42' S., long. 14° 41' W. ; 

 2350 fathoms ; globigerina ooze. 



O'phioglypha SGulptilis, Lym. (PI. VI. figs. 16-18). 



OpMoglypha sculptilis, Lym., Bull. Miis. Comp. Zool., vol. v., part 7, p. 84, pi. iv. figs. 115, 116, 

 1878. 



Six minute arm spines. First under arm plate broader than long ; those beyond 

 longer than broad. Eadial shields separated within by a cluster of large scales. Disk 

 high. Basal under arm plates about as long as broad. Arms high and rounded. 



(Type specimen from Station 237.) Diameter of disk 12-5 mm. Width of arm close to 

 disk 3 mm. Mouth papillse five on each side, broader than long, shaped like blunt saw-teeth, 

 with two blunt pointed papillse at apex of jaw. Mouth shield much rounded, pentagonal, 

 with an angle inward, and two outer angles almost blended in a wide curve ; length to 



