MUSEUM OF COMPARATIVE ZOOLOGY. 221 



have re-entering curves on their lateral sides, where are tfie tentacle-pores ; 

 beyond these, they are broad, triangular, with the two inner sides curved. 

 Side arm-plates thick and smooth, meeting below, beyond the third under arm- 

 plate, separated above by the large, triangular upper arm-plates, which are 

 obscured by the thick skin, but, on drying, are seen to be cracked in many 

 irregular pieces. Disk thin, with constrictions between the arms, covered 

 with a thick skin which obscures the thin, irregular, angular scaling, to be 

 seen only when partly dry ; on the margin of the interbrachial space there is 

 a semicircular plate. Radial shields large, longer than broad, of an angular 

 oval shape, widely separated by the disk-scaling ; length to breadth 5 : 4. Geni- 

 tal opening extending from the mouth-shield about two thirds of the way to 

 the margin, and bordered on either side by a close-set row of angular granules. 

 Two small, flat, rounded tentacle-scales on the interbrachial side of the tenta- 

 cle-pores of the second and third under arm-plates ; those of the second being 

 the larger. No arm-spines, except at tip of arms, where there are two, low 

 down, and like minute papillae. Color in alcohol, pale yellow. 



Station 49, 118 fathoms, 12 + specimens. 



This curious species is of a brilliant orange-color when alive. It was brought 

 up in large niimbers from a bottom of soft mud. At the first glance it seems 

 an Ophiomyxa, but, when partly dry, the details of external structure appear. 



Ophioconis miliaria sp. nor. 



Plate III. Figs. 49-51. 



Special Marks. — Seven or eight arm-spines, the upper ones as long as three 

 arm-joints. Two tentacle-scales. 



Description of an Individual (off Havana). — Diameter of disk 7.5 mm. 

 Length of arm about 35 mm. Width of arm close to disk, without spines, 

 2.3 mm. There are ten or more short, pointed, close-set papillae on each .side 

 of the mouth-angle, the four outer ones and that at apex of jaw being larger 

 and more rounded. On removing the fine granulation which closely covers 

 the mouth-angle, the mouth-shield can be seen, of a rounded heart-shape, with 

 a sharp angle within. Side mouth-shields small, long and narrow, not quite 

 meeting within. Under arm-plates overlapping, wider without than within, 

 with outer edge curved, and deep re-entering curves on the lateral sides, where 

 are the tentacle-scales. Side arm-plates small and thin, meeting neither above 

 nor below. Upper arm-plates rounded, transverse diamond-shaped, with an ob- 

 tuse angle within, and outer edge irregularly curved ; they are highly arched, 

 forming a longitudinal ridge. Disk round and flat, covered above and below 

 with a close, fine granulation, about 13 grains in the length of a mm. No 

 radial shields to be distinguished beneath the granulation. Genital openings 

 short, extending from the mouth-shield only about half-way to the margin of 

 the disk. Arm-spines near disk seven or eight, long and slender, the three 

 upper ones being about as long as three arm-joints, the four or five lower con- 

 siderably shorter. Two short, flat, bluntly pointed tentacle-scales, of which 



