OCR Text |
Show 1879.] THE C O R E A N A N D J A P A N E S E SEAS. 25 nearly half as long as the carapace, the spines of which it is composed divergent near their extremities, and armed on their undersides with two or three spinules. Anterior legs with the arm and wrist covered with small spines ; arm with a strong conical curved spine on the upper margin at its distal extremity ; palm robust, about as long as the arm, with fewer spinules arranged in longitudinal series ; fingers naked. Ambulatory legs with numerous small spinules; the terminal joints, and in the last pair the two preceding joints are without spines and hairy. Length of carapace to base of rostrum f inch, breadth about A$ inch; length of anterior leg 3^ inches. This species was obtained at a depth of 63 fathoms, in October 1874, in lat. 34° I' N., long. 136° 20' E. A single male individual was collected. As it is certainly one of the most striking novelties in the collection, I have much pleasure in dedicating it to its indefatigable discoverer, Capt. H. C. St. John, R.N. ACHCEUS SPINOSUS, sp. n. Carapace triangular, narrowed behind the orbits, as in Achceus (Lnachus) lorina, and armed with six spines above, viz. one on the gastric, one (which is bilobate) on the cardiac, and two on each branchial region; there are also two or three small spines or tubercles on the sides of the body, beneath the hepatic and branchial regions. The rostrum, as in all the species of the genus, is very small and bilobate. Eye-peduncles robust, laterally projecting and armed with a strong tubercle in front. Anterior legs (in the male) robust; arm and wrist with a few scattered granules above; palm swollen, with about six spinules on the upper margin and a few small granules on the lower margin, near its base; fingers acute, with a wide hiatus at base when closed, both the fingers with a strong tooth on their inner margins near the base ; both are faintly cristated on their outer margins. Ambulatory legs very slender, the terminal joint of the last pair strongly falcated. Terminal postabdominal segment subtriangular. Length + inch, breadth | inch. A single specimen (male) was collected at a depth of 30 fathoms, in lat. 34° 10' N., long. 136° 47' E. The nearest ally of this species seems to be the Achceus lorina (Lnachus lorina, Ad. & White, Zool. Samarang, Crust, p. 3, pi. ii. fig. 2, 1848), from Mindanao, from which it differs in the number and disposition of the spines of the carapace. Both of these species externally resemble lnachus, but differ in the absence of defined orbits and in the falcated posterior legs, on account of which they must be referred to Achceus. ACHCEUS TURERCULATUS, sp. n. There are several specimens of a species of Achceus in the collection, which are all unfortunately in an imperfect condition, the anterior and most of the ambulatory legs being absent. The carapace is triangular and broader than in the preceding species, without spines, not constricted behind the interocular region ; the regions are con- |