| OCR Text |
Show 302 MR. E. J. MIERS ON THE PEN^EID^E. [Mar. 5, (1850), under the name of Solenocera philippii. Besides P. sipho-nocerus the Peneeus distinctus of De Haan (Faun. Japon. Crust. p. 194, 1849) evidently belongs to this genus, and must be designated Solenocera distincta. Of it I have seen no specimens. Perhaps also the Peneeus crassicornis of Milne-Edwards (Hist. Nat. Crust, ii. p. 418, 1837) from India should be referred here. PENEEUS DOBSONI, sp. n. (Plate XVII. fig. 2.) Cephalothorax smooth, not hairy or scabrous, with the cervical, gastro-frontal, and cardiaco-branchial sutures faintly indicated. Antennal and hepatic spines present, but no pterygostomian spine at the antero-inferior angle of the cephalothorax. Rostrum slender, not quite reaching to the apex of the antennal scale, 7-9-dentate above, about four of the teeth being posterior to the frontal margin, the posterior tooth separated by a greater interval than the others, which are equidistant from one another; there are no teeth on the anterior third of the upper margin, nor on the inferior margin; the apex, in the only specimen which appears perfect, is acute. Posteriorly the rostrum is prolonged into a short median dorsal crest, which terminates at some distance from the posterior margin. There are no longitudinal median dorsal sulci. The first five postabdominal segments are rounded at their postero-lateral angles ; the posterior margins of the first, second, fourth, and fifth have a semicircular notch on each side of the body ; there is a longitudinal median dorsal carina on the third to sixth segments, which is but faintly indicated on the third segment, and a faintly indicated lateral carina on each side of the fifth and sixth segments; the terminal segment is longitudinally sulcate above, the extremity very slender and acuminate, the lateral margins ciliated, but without mobile spines; the appendages of the sixth segment somewhat oblong-oval, and narrowed at the distal extremities. The eyes are very large ; the antennules with the joints of the peduncle flattened on their inferior surfaces, and with two flagella, of which the inner is nearly twice as long as the outer, but not as long as the cephalothorax. Antennae with the flagella very long. The crowns of the mandibles are slightly concave on their inner surfaces, the cutting-edges thin, and with a tooth near the apex; the palpus tomentose and 2-articulate, the terminal joint foliate, triangular and acute. The second maxillipedes are densely hairy ; the outer maxil-lipedes are very slender, almost styliform, aud their exognathi reach almost to the extremity of the penultimate joint. The three anterior pairs of legs are small and very slender, successively slightly increasing in length, but the third pair not more robust than the preceding ; they are very feebly didactyle, and the fingers are much shorter than the palmar portion of the hand ; the fourth pair of legs are very feeble, and much shorter than the preceding; the fifth pair are obsolete, thickened, and two-jointed, the terminal joint constituting an indurated corneous lobe ; there is also a small lobate prolongation at base of each of the fourth legs; and the lobe between the bases of fifth pair of legs (which resembles in form that usual |
