MUSEUM OF COMPARATIVE ZOOLOGY. 87 



lateral constriction which niakea a pointed lobe inward ; length to breadth 

 2.7 : 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 lateiul 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, whicli 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 tliick, 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 interbrachial 

 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 eilge a row of large, square, close-set papilla3, which become spini- 

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

 arnr-spines, one at the top, one near the middle, and one at the lower edge of 

 the side arm-plate. Three or four small rounded tentacle-scales on each side of 

 firet three sets of tentacle-pores ; those just beyond the disk have two or three 

 scales on the inner, and two on the outer side. Color in alcohol, light gray. 

 Station 216, 2000 fathoms, 2 specimens. 



Ophioglypha Lacazei sp. nov. 



Plate III. Figs. 58 - 60. 



Special Maries. — Three minute arm-spines, high up. Radial shields rounded, 

 separated by one scale within. One large marginal plate, with small scales 

 about it. Disk high. Basal under arm-plates about as long as broad. Arras 

 high and rounded. 



Description of an Individual (Station 160). — Diameter of disk 11 mm. 

 Length of arm about .30 nmr. Width of arm close to disk 2.3 mm. Mouth- 

 papilUe 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 2.5 : 

 2.5. Side mouth-shields rather short and wide, meeting within, where 

 they are broader than without. First under arm-idate long, wedge-shape, 

 with outer edge curved ; the rest axe-shaped, with outer edge curved, and latertd. 

 sides re-enteringly curved. Side arm-plates regular and scarcely swollen. 

 Upper arm-plates large, broader than long, hexagonal, with outer angles much 

 rounded ; lengtli to breadth 1 : 1.3. Farther out they become nearly semi- 



