DECAPO DA (mACRDRA). 
Crust. 32 
Oropho [r] rhijnchus, g. n. Rostrum triangular, covering partly the 
eyes ; maxillipeds very small ; first pair of legs thick and short. 0. 
aries, spinosus, squamosus, sharreri, nitidus, and spinoculatus, spp. nn., id. 
1. c. pp. 58 & 69, West Indies, 191-1591 fath. 
Elasmonqtus^ g. n. Cephalothorax nearly flat, without spines, orbito- 
antennal region very narrow; first abdominal segments keeled above. 
E. longimanus. brevimanus, armatus, and abdominalis, spp. nn., id. 1. c. 
J3p. 60 & 61, West Indies, 200-625 fath. 
Dip>tychus^ g. n. Rostrum simple, external antennae very small, maxilli- 
peds long and slender ; the caudal fin can be completely folded under the 
last abdominal segments. D. nitidus, uncifer, armatus, riujosus, and inter- 
medins, spp. nn., id. 1. 6. pp. 62 & 63, West Indies, 88-734 fath. 
Ptychogaster, g. n. Distinct from the former by the narrower cephalo- 
thorax, longer antennae, and very long legs. P. spinifer, sp. n., id. 1. c. 
p. 64, West Indies, 123-180 fath. 
Palinurid^. 
A stage of development of ralinurus, ScyUarus, and Parihacus, inter- 
mediate between Phyllosoma and the adult form, described by Boas, 1. c. 
pp. 83 & 182, pi. V. fig. 184. It is of the general appearance of the adult, 
but exopodites are present, and the lateral parts of the cephalothorax are 
separated from the dorsal by a low crest, the same as in Palinurellus and 
ScyUarus, but which disappears in the adult Palinurus ; he calls it 
“ Natant-stage.” Phyllamphion elegans (Reiuh.) is again an intermediate 
stage between this and Phyllosoma. 
Palinurus. Generic characters discussed, and some specific distinctions 
(for instance, the relative length of the thoracic legs), pointed out by 
Boas, 1. c. pp. 78-82 & 90-92, pi. i. fig. 7, pi. iii. figs. 84 & 108, pi. iv. 
fig. 135, pi. V. figs. 148, 149, & 171 ; recapitulated, pp. 179-181. Among 
all species observed by the author, P. lalandii (M.-E.) approaches nearest 
to ScyUarus, pp. 89-93. 
Notes on several Malayan species ; Miers, Ann. N. H. (5) v. pp. 378 & 
379. 
Palinurus penicillatus (Oliv.) = ehrenbergi (Heller), tubercles not pili- 
ferous ; De Man, Notes Leyd. Mus. ii. p. 185. 
Palinurus tumidus, sp. n., Kirk, Tr. N. Z. Inst. xii. pp. 313 & 314, pi. xi., 
and Ann. N. H. (6) vi. p. 14 ; 24 inches long, the common crayfish at the 
Sydney market. 
Palinustus, g. n. Distinct from Palinurus by the ophthalmic ring 
being quite uncovered, by the long internal antemiro with small mulM- 
articulated flagellum, and by the flattened horizontal frontal horns. P. 
truncatus, sp. n., A. Milne-Edwards, Bull. Mus. 0. Z. viii. p. 66, Cariacou, • 
W. Indies, 163 fath. 
Palinurellus. Generic characters discussed by Boas, 1. c. p. 183. It is, 
according to him, the most primitive form of the Palinuridm, and there- 
fore nearer than any other to Ilomarus. 
