. Bulletin - United States National Museum. Science. 302 BULLETIN 54, UNITED STArp:S NATIONAL MUSEUM. Type.—C^t. No. 22571, Both sexes of this species are known, the two forms resembling- each other in every respect, with the exception that in the male there is a stylet on the inner branch of the second pair of pleopods. Prof. S. J. Holmes writes that the sexes do not show an^^ marked dimorphism. He also admits the following:" "An examination of several specimens of the species showed that the males present no appreciable external ditl'erences from the females except that, a
. Bulletin - United States National Museum. Science. 302 BULLETIN 54, UNITED STArp:S NATIONAL MUSEUM. Type.—C^t. No. 22571, Both sexes of this species are known, the two forms resembling- each other in every respect, with the exception that in the male there is a stylet on the inner branch of the second pair of pleopods. Prof. S. J. Holmes writes that the sexes do not show an^^ marked dimorphism. He also admits the following:" "An examination of several specimens of the species showed that the males present no appreciable external ditl'erences from the females except that, as a rule, they are of somewhat larger ; Specimens of both sexes are in the collection of the U. S. National Museum. The inner branch of the second pleopod of the male is figured. DYNAMENE ANGULATA Richardson. Di/nainene aiujtdnta Richardson, Proc. U. 8. Nat. Mus., XXIll, 1901, pp. 534-535. Locality.—No Name Key, Florida. Found among alga^ at low tide. Surface of body smooth; color yellow. Head large, with small median point on its anterior margin. First pair of antenna^ reach the posterior margin of the second thoracic segment; flagellum composed of nine joints. Second pair of antennae reach the posterior mar- gin of the fourth thoracic segment; flagellum composed of thirteen joints. The thoracic segments are subequal in length, the first ])eing a little longer than any of the others. The epimera are broad and short, with acute lateral angulations. The first abdominal segment bears suture lines indicative of coalesced seg- ments. There are three small tubercles in a transverse row, one median and one on either side. The terminal segment is subtriangular, with the extremity produced and deeply excavate, the excavation l)eing like an inverted V. At the base of this segment arc three large tubercles in a transverse row, the median one being long and very acute, the lateral ones rounded. The branches of the uropoda are similar in shape, the outer one being somewhat lo
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