OCR Text |
Show 1867.] MR. J. Y. JOHNSON ON NEW CRUSTACEANS. 897 plate, is shorter than either the sixth segment or the lateral swimming- plates. It is narrow and pointed, furnished with a deep longitudinal groove on its upper surface and a small marginal tooth at each edge, nearer the base than the posterior extremity. The lateral swimming-plates are narrowly oval, and those of the inner pair are marked on their upper surfaces by two longitudinal ridges, those of the outer pair by four similar ridges. There is a tooth at the outer side of the latter pair of plates, not far from the posterior extremity. The imperfect condition of the single individual obtained prevents me describing the rostrum, the eyes, and the filaments of both pairs of antennae. It may be stated, however, that the rostrum appears to have carried a crest at each side, that the longer filament of the superior antennae is thickened at the base and setiform above, whilst the shorter filament of these antennae is setiform throughout, and that the filament of the inferior antennae is compressed below. It may be further stated that the median carapacial crest appears to have carried a small tooth at a point distant about three-tenths of the length of the carapace from the anterior border. The species is named in compliment to m y friend Mr. Henry Woodward of the British Museum, well known for his labours amongst fossil Crustacea. The following are the dimensions of the specimen, which is now in the British Museum : - inches. Total length from anterior border of carapace to end of caudal plates 65 Carapace, length of side 2\ • *, height 1 --, thickness f Lamellar palp of inferior antennae Ii Jaw-feet, length of external pair lg Ambulatory legs, length of fourth pair 1\ , length of third pair 1% _ , length of first pair 1 g False feet, length of second, third, and fourth pairs .. If PENEEUS EDWARDSIANUS, sp. n., $ . Colour a brilliant crimson, with an obscure fuscous cross band on the hinder part of the carapace and on each abdominal segment. Carapace somewhat compressed, shining, hairless, its surface unarmed, with a low obtuse median crest commencing near the posterior border. This crest rises gradually, and projects in front as the rostrum, which is long, pointed, compressed, rather slender, and curved obliquely upwards for its anterior half. At each side of its basal portion there is a rounded crest. It extends beyond the peduncles of both pairs of antennae, and beyond the lamellar palp of the superior antennae; but it is considerably shorter than the carapace. It carries two small teeth-one a little in advance of its base, and a second further in front, separated from the first by a distance equal to one-fourth of the length of the rostrum. About the same |