532 W. DE MORGAN. 



Station I. 75 fathoms. 1 specimen. 



Station II. 7-5 fathoms. 15 specmiens. 



Station V. 109 fathoms. 14 specimens. 



Station XL 146 fathoms. 4 specimens. 



Station XII. 246 fathoms, 2 specimens. 



The diameters of the discs measured dry were as follows : — 



Station I. 1 (6 mm.). 



Station II. 3 (2 mm.), 1 (2-5), 1 (3), 2 (5), 2 (5-5), 4 (6), 1 (6-5) mm. 



Station V. 1 (2), 1 (4), 2 (6-5), 4 (7), 3 (7-5), 2 (8), 1 (8-5), 1 (9) mm. 



Station XI. 2 (3), 2 (4-5) mm. 



Station XII. 1 (5), 1 (6) mm. 



One specimen is recorded from Plymouth {Journal M.B. A., Vol. V, 

 N.S., 1897-9). This was from Bolt Head shell gravel ground. It 

 agrees in all respects with the Huxley specimens. Diameter of 

 disc, 4*5 mm. 



Four specimens were also obtained from a collection made in the 

 English Channel by Mr. Crawshay, at Station V, 20 miles S. 19° W. of 

 the Eddystone {Jour. Mar. Bio. Assoc, IX, p. 336). The discs of 

 these measure 7, 6, 6, and 3'5 mm. in diameter, and in other respects 

 tliey are similar to the Huxley specimens. 



In all the above specimens the number of lateral spines is constant, 

 namely three. The uppermost spine is the longest, and reaches half- 

 way up the next dorsal plate of the ray. This exactly agrees with 

 Liitken's description. Heller also states that there are three lateral 

 spines. 



Hodge (5), however, states that there are five lateral spines, and 

 Jeffrey Bell (1) " about five." 



Jeffrey Bell (1) describes as a " very small species." 



Hodge (5) says that the disc " in well-grown individuals measures 

 about I inch." 



Liitken says that it is 5 to 6 mm. in diameter. 



The Hiixley specimens show that it grows to a much larger size. 

 The largest dried specimen from Station V, 109 fathoms, was 9 mm. 

 diameter. 



In descriptions of Ojyhiura affinis emphasis is laid on the regular 

 rosulation of the primary plates. Judging from the Huxley specimens 

 this is true only of the smaller and presumably younger individuals. 

 In these there is a distinct rosette, consisting of a central and five sur- 

 rounding plates, separated by smaller scales. As the animals increase 

 in size the arrangement of the plates is not so regular, and they 



