CHAP, v.j THE GULF-STREAM. 371 



Only one specimen occurred of a species of Amphiura which 

 has not yet been determined ; but there were seven or eight 

 examples of the handsome Ophioglypha figured in wood -cuts 

 104 and 105. Ophioglypha hullata belongs to the small sub- 

 section of the genus, with short, knotted arms, slit -like foot- 

 pores, and marked grooves between the joints of the arms ; 

 which already contains two arctic species, O. nodosa and 0. Stu- 

 witziij it is most nearly allied to the former of these, but there 

 are many points of distinction. 



The diameter of the disk in a full-grown specimen is 10 mm., 

 and the length of the arm is about twice and a half the diame- 

 ter of the disk. The dorsal surface of the disk is covered with 

 rather prominent granular scales of different forms and sizes; 

 six of the larger of these form a rosette in the centre of the 

 disk, but they are separated from one another by bands of the 

 scaly perisom, and not in contact as in O. nodosa. The radial 

 shields are prominent, slightly longer than broad, and they also 

 are separated throughout their entire length by wedges of peri- 

 som. The mouth-shields are egg-shaped, very large and prom- 

 inent, occupying nearly the wliole space between the arms, and 

 running out quite to the edge of the disk. These inflated 

 mouth-shields give a very marked character to the species. The 

 mouth-papillffi are short and blunt, about twelve on each angle 

 of the mouth ; the teetJi are six or eight in number on each an- 

 gle, and rather long and pointed. The under arm -plates are 

 square and prominent, apposed to one another in series near the 

 bases of the arms, but rapidly separating and becoming smaller 

 and rounder distally. The upper arm-plates are small and like- 

 wise prominent. The lateral arm-plates are large and rounded, 

 and project laterally, which gives its peculiar knotted or beaded 

 appearance to the arm. The arm -spines are very small, in a. 

 row of five or six on each lateral plate ; on the distal arm-joints 

 they become somewhat longer. The large elliptical foot-pores 

 are fringed all round with closely set flat papillae. Ophioglypha 



