PARASALENIA POHLII. 369 



Periproct moderately large, its long diameter about | that of the long diameter of 



the abactinal system; each genital plate with at least one well-developed tubercle gratiosa. 



Periproct very small, its long diameter less than J that of the long diameter of the 



abactinal system; genital plates without tubercles Pohlii. 



Parasalenia gratiosa A. Ag. 



Parasalenia gratiosa A. Agassiz, 1863. Bull. M. C. Z., I, p. 22. 



The coloration of adult specimens of this species is very striking for the test 

 and spines are very dark, more or less nearly black, while the milled ring of each 

 primary spine, is pure white, in marked contrast. Half grown specimens are 

 much lighter, usually a sort of reddish brown. In really young specimens, the 

 shade is often very nearly red, and the spines are more or less banded. The only 

 specimen brought home by the "Albatross" has the long axis 11 mm. and the 

 short one, 8 mm. It has a distinctly roseate tinge and the primary spines are 

 banded, though not with red and white. The secondary spines, and the bases 

 and tips of the primaries are dull pink; the remainder of each primary is light 

 greenish brown with three indistinct bands of a much lighter shade; the milled 

 rings are pearly white. The long diameter of the abactinal system is 4 mm. and 

 that of the periproct is almost 2. All of the genital plates are in contact with 

 the periproct but not one of them has even a minute tubercle! Such a specimen 

 renders the distinctness of Pohlii doubtful. 



Makemo, Paumotus, Oct. 21, 1899. 



Parasalenia Pohlii Pfeff. 



Parasalenia Pohlii Pfeffer, 1887. Verhandl. Ver. Naturw. Unterh. Hamburg, VI, p. 110. 



Plate 95, figs. 1-5. 



It has seemed desirable to give a few figures illustrating the pedicellarise of 

 this species, for the purpose of making easy, comparison with those of Echino- 

 metra. Only one tridentate was found (PI. 95, fig. 1} ; it had an exceedingly long 

 neck and slender valves about a millimeter long, and is not essentially different 

 from those of gratiosa and Echinometra. The globiferous are abundant, usually 

 with glands (PL 95, fig. 8} but occasionally without (PL 95, fig. 2) ; they vary 

 much in size, the valves (PL 95, fig. 4) , which lack a lateral tooth on the blade 

 (PL 95, fig. 5), ranging from .30 to .60 mm. The ophicephalous and triphyllous 

 are small but fairly common, and the former have the calcareous matter in the 

 valves distinctly red. In other respects, these pedicellariae cannot be distin- 

 guished from those of gratiosa and Echinometra. 



