ASTEROIDEA DREDGED DURING CRUISE OF H.M.S. " TRITON." 159 



The length of the ray is much less in the new species, the radial proportions 

 being for R. Murrayi, R, = 1'3?*, and for R. tumidus R = 19r, in specimens of 

 the same size. The rays are consequently much less defined, and are more 

 widely expanded at the base. In R. Murrayi the marginal contour is dis- 

 tinctly festooned by the infero-marginal plates, and each of these bears a group 

 of enlarged spinelets, neither of the characters being present in R. tumidus. 

 The ambulacral spines appear to be more numerous in the new form, the arma- 

 ture of the mouth-plates somewhat different, the distribution of papulae more 

 numerous on the dorsal surface, and the character of the spinelets, both on 

 the abactinal and actinal areas, more simple. 



I have great pleasure in associating this interesting species with the name 

 of Mr John Mukray, whose zealous labours in connection with deep-sea 

 dredging are well known. 



8. Mimasier Tizardi, Sladen. 



Station 10. August 24, 1882. Lat. 59° 40' N., long. 7° 21' W. 

 Depth, 516 fathoms ; bottom temperature, 46° Fahr. 



Station 11. August 28, 1882. Lat. 59° 29' K, long. 7° 13' W. 

 Depth, 555 fathoms ; bottom temperature, 45°5 Fahr. 



9. Hippasteria plana (Linck), Gray. 



Station 3. August 8, 1882. Lat. 60° 39' 30" N., long. 9° 6' W. 

 Depth, 87 fathoms; bottom temperature, 49° 5 Fahr. 



10. CribreUa oculata (Linck), Forbes. (Plate XXVI. fig. 8.) 



Station 1. August 4, 1882. Lat. 59° 51' 30" N., long. 6° 21' W. 

 Depth, 240 fathoms ; bottom temperature, 47° "6 Fahr. 



Station 10. August 24, 1882. Lat. 59° 40' N., long. 7° 21' W. 

 Depth, 516 fathoms ; bottom temperature, 46° Fahr. 



Station 11. August 28, 1882. Lat. 59° 29' N., long. 7° 13' W. 

 Depth, 555 fathoms ; bottom temperature, 45°*5 Fahr. 



The specimens from Stations 10 and 11 have an abnormal appearance, even 

 for this variable species, probably, consequent on their deep-water habitat. 

 The variation is characterised by the comparative smallness of the disk and the 

 greater length and narrowness of the rays, which are subcylindrical and almost 

 uniform in breadth throughout, especially in the small examples where the 

 expansion at the base is very slight. The single example from Station 11 

 measures R = 39 mm., r = 5 mm., breadth of ray at the base 575 mm. The 

 spinelets of the abactinal area are very small, and rather more widely spaced 

 than in the normal form. They are conically pointed, and have the appearance 



