no. 1S08. RECENT AFRICAN CRINOIDS— CLARK. 25 



HETEROMETRA JOUBINI, new species. 



Description. — Cirri XXII, 39-43, 30 mm. long; the segments are 

 all subequal, about half again as broad as long; those in the outer 

 half of the cirrus bear short dorsal spines. The cirri as a whole are 

 comparatively long and moderately stout. 



Twenty arms 80 mm. long; ten IIBr 4 (3 + 4) series are present. 

 The arm divisions and the arm structure are as in //. reynaudii of 

 Ceylon. 



P 2 is the longest, half again as long as P x or P 3 , slender, with 21 

 segments, which become squarish on the fourth or fifth, then some- 

 what longer than broad, and elongate terminally; P 3 is about as long 

 as P x ; P 4 and the following pinnules are shorter than P 3 . The lower 

 segments of the proximal pinnules are moderately c annate. 



Compared directly with the type of H. reynaudii, this species is 

 seen to differ in its longer and somewhat more slender cirri, which 

 have slightly longer segments. 



Locality. — Zanzibar; the type, which is in the Paris Museum, was 

 collected by M. Rousseau in 1841. Dr. P. H. Carpenter examined 

 the specimen on his visit to Paris, and noted it as representing a new 

 species, though he never mentioned it in print. 



HETEROMETRA GRAVIERI, new species. 



Description. — Cirri XXVIII, 36-39, 21 mm. long, more slender 

 than those of the preceding species ; first segment short, the following 

 gradually increasing in length to the fifth or sixth, which is from one- 

 third to one-half again as broad as long, and after the eighth or ninth 

 beginning to decrease again, so that those in the outer half are about 

 twice as broad as long; the segments in the outer half of the cirri 

 bear short dorsal spines. 



Nineteen arms 80 mm. long, nine IIBr 4 (3 + 4) series being present ; 

 the arm structure resembles that of the preceding species ; the division 

 series have produced lateral margins; the brachials are only very 

 slightly overlapping. 



P t small and weak ; P 2 half again as long as P 1; slender, and flagel- 

 late distally, with 24 segments, of which the second-fifth are carinate ; 

 P 3 slightly smaller than P 2 , but much larger than P x ; P 4 about as 

 large as P x ; following pinnules slightly shorter than P 4 ; the proximal 

 segments of all the lower pinnules are distinctly carinate. 



As a whole this species is slightly more slender and delicate than 

 the preceding, though of the same size. 



Locality.— Zanzibar; the type, which is in the Paris Museum, was 

 collected by M. Rousseau in 1841. Dr. P. IT. Carpenter also noted 

 this species as new and as different from the preceding. 



