304 THE VOYAGE OF H.M.S. CHALLENGER. 



This type has normally one and sometimes two post-distichal axillaries ; while there 

 are three in an undescribed species (Actinometra nigra) which was brought by Professor 

 Semper from the Philippines. On the other hand there are none in Actinometra 

 maculata (PI. LV. fig. 2), and this is usually also the case in Actinometra pulchella, 

 though palmars may be occasionally present (PI. LII. fig. 1). This remarkable type 

 occurs on both sides of the Atlantic, and possibly also in the Eastern Archipelago ; but 

 all the remaining members of the group are limited to the latter region and to the 

 Western Pacific. Two of them, Actinometra maculata and Actinometra stelligera, were 

 obtained by the Challenger, but the group is not represented in the " Alert " collection, 

 though Dr. Coppinger dredged in two localities, Bowen and Torres Strait, where 

 examples of it had previously been obtained. 



The following scheme shows the mutual relations of the four species belonging to the 

 Stelligera-giovLY> : — 



A Arm-joiuts triangular and of moderate length, . . . .1. pulchella, Pourtales, sp. 



B. Arm-joints relatively short, becoming rather saucer-shaped. 

 I. The first, and parts of the second radials concealed. 



a. No post-distichal axillaries. The later cirrus-joints bluntly 



spinous, . . . . . . .2. maculata, n. sp. 



6. One or two post-distichal axillaries. The cirri scarcely 



spinous, . . . . . . .3. stelligera, n. sp. 



II. The first radials partly visible, and the second entirely so. Three 



post-distichal axillaries, ...... nigra, Semper, MS. 



1. Actinometra pulchella, Pourtales, sp. (PI. IV. figs. 5, a-c; PI. LII. figs. 1, 2). 



Specific formulas — a.y.; and — a.2.(2)."2.-,-. 



1878. Antedon alata, Pourtales, Bull. Mus. Comp. Zool., 187S, vol. v. No. 9, p. 215. 



1878. Antedon pulchella, Pourtales, Ibid., p. 216. 



1881. Actinometra pulchella, P. H. Carpenter, Ibid., 18S1, vol. ix. No. 4, p. 10. 



1882. Antedon alata, Bell, Proc. Zool. Soc. Lond., 1882, p. 532. 

 1882. Actinometra pulchella, Bell., Ibid., p. 535. 



1882. Actinometra -pulchella, P. H. Carpenter, Ibid., p. 717. 



1884. Actinometra pulchella, P. H. Carpenter, Proc. Roy. Soc. Edin., 1884, vol. xii. p. 369. 



Localities. — H.M.S. " Porcupine " : Station 25, July 27, 1870 ; near Cape St. Vincent ; 

 lat. 37° 11' N., long. 9° 7' W.; 374 fathoms; rock; bottom temperature, 53°-5 F. One 

 mutilated specimen. 



Station 31, August 1870; lat. 35° 56' N., 7° 6' \V.; 477 fathoms; clay; bottom 

 temperature, 50° "5 F. One mutilated specimen. 



H.M.S. Challenger: August 1873, St. Paul's Rocks. One specimen. 



Station 192, September 26, 1874; near the Ki Islands; lat. 5° 49' 15" S, long. 

 132° 14' 15" E.; 140 fathoms ; blue mud. One doubtful specimen. 



