62 THE VOYAGE OF H.M.S. CHALLENGER. 



wider than the inner, with two pointed ones at apex of jaw. Mouth shield large, much 

 rounded triangular, with a lateral constriction which makes a pointed lobe inward ; length 

 to breadth 27 : 2 - 5. Side mouth shields long, crooked, and very narrow, meeting within. 

 First and second under arm plates larger than those beyond, axe-shaped, with outer edge 

 wide and curved, and lateral sides re-enteringly curved ; those beyond are similar, but 

 present an angle inward. Side arm plates swollen, broad, minutely tuberculated, meeting 

 below, outside the disk ; separated above by upper arm plates, which are narrow, four 

 sided, much swollen, with curved lateral and straight outer and inner sides ; towards the 

 middle of the arm they become longitudinal oval. Disk thick, smooth, and angular, 

 covered in the centre by small, thin, irregular overlapping scales, in the midst of which 

 are the six primary plates, which are rounded and rather small. In each mterbrachial 

 space, and connecting the radial shields, is a large rounded angular plate. Outside of 

 this are two large marginal plates, which extend below nearly or quite to the outer edge 

 of the mouth shield. Radial shields much rounded triangular, broadly meeting without, 

 separated within by two or three disk scales ; length to breadth 2 : 1 7. Interbrachial 

 spaces below covered by the two great marginal plates, between which and the mouth 

 shield there are sometimes two or three small scales. Genital scales rather wide, and 

 carrying on the free edge a row of large, square, close-set papillae, which become spini- 

 form where they form the arm comb. Usually three, rarely four, very minute arm spines, 

 one at the top, one near the middle, and one at the lower edge of the side arm plate. 

 Mouth tentacle pores separated from mouth slit. Three or four small rounded tentacle 

 scales on each side of first three sets of tentacle pores ; those just beyond the disk have 

 two or three scales on the inner, and two on the outer side. Colour in alcohol, light 

 grey. 



Station 216.— February 16, 1875; lat. 2° 56' N., long. 134° 11' E. ; 2000 fathoms ; 

 globigerina ooze. 



Ophioglypha lacazei, Lym. (PI. VI. figs. 4-6). 



Ophioglypha lacazei, Lym., BulL Mus. Comp. Zool., vol. v., part 7, p. 87, pL iii. figs. 58-60, 

 1878. 



Three minute arm spines, high up. Radial shields rounded, separated by one scale 

 within. One large marginal plate, with small scales about it. Disk plates closely 

 soldered and ill defined. Disk high. Basal under arm plates about as long as broad. 

 Arms high and rounded. 



(Type specimen from Station 160.) Diameter of disk 11 mm. Length of arm about 

 30 mm. Width of arm close to disk 2*3 mm. Mouth papillae very small and widely 

 separated ; eleven to thirteen to each angle ; one large at apex of jaw. Mouth shield large, 

 much rounded pentagonal, with obtuse angle inward, and outer side curved ; length to breadth 



