CRUSTACEA. 55 
at the time in the Annales des Sciences naturelles is a female, answering altogether to the specific 
features in the specimens of the same sex now before us. 
There can be also no doubt as to the specific identity of both d’Orbigny’s and Gay’s figures, 
the originals of which were procured at Valparaiso. They both represent the female. 
Specimens of both sexes were brought home by Lieutenant Gilliss. In the female the 
external maxillipes are equal in length to the distance between the apex of the rostrum and 
the articulation of the caudal region upon the thorax. ‘The first pair of legs extends to nearly 
the serrated portion of the rostrum; the apex of their chela, therefore, does not reach as far as 
the extremity of the latter organ. The tip of the second pair of legs is even with that of the 
first pair, though inserted behind it. The third pair of legs is the longest, projecting beyond 
the second and first pairs, and extending to nearly the apex of the rostrum. The tip of the 
fourth pair is nearly even with the second and the first. Finally, the extremity of the fifth 
pair reaches the base of the last article of the third pair; its tip, therefore, remaining behind 
that of all the others. The rostrum is equal in length to the middle line of the cephalo-tho- 
racic region. Now there can be no doubt as to the identity of these specimens with those 
figured by d’Orbigny and Gay. 
In the male the external maxillipes are nearly as long as the absolute length of the animal, 
since they equal the distance between the apex of the rostrum and the middle of the length of 
the caudal paddles. The first pair of legs is stouter, the hand more elongated, and extending 
beyond the apex of the rostrum for the whole length of the finger. The second pair is very 
slender, hardly reaching with its extremity the middle of the hand, and not quite as far as the 
denticulated portion of the upper edge of the rostrum. The third pair extends to the base of 
the moveable finger or upper portion of the big claw, and consequently a little beyond the apex 
of the rostrum. The tip of the fourth pair is nearly even with, mayhap slightly longer than 
the second. Finally, the fifth pair slightly projects beyond the base of the last article of the 
third pair. The rostrum is somewhat longer than the middle line of the cephalo-thoracic 
region. The antenne are longer than in the preceding instance. In every other particular 
both sets of specimens appear to agree perfectly. Those from which our description is drawn 
belong to the latter group. 
RHYNCHOCINETES TYPUS, Edw. 
Spec. cHAR. Dull greenish, variegated with yellowish red. Locomotory appendages and jaws 
transversally barred or annulated with pinkish. Patches of the latter hue are also observed 
upon the convexity of the caudal region. 
Syn. Lhynchocinetes typus, Epw. Ann. Sc. Nat. 2de Série VII, Zool. 1837, 165, Pl. iv, C.— 
Hist. Nat. Crust. II, 1837, 383. 
Epw. et Lucas, in D’Orb. Voy. Amér. Mérid. VI, 1; Crust. 1843, 36, Pl. xvu, 
fig. 1. 
Nic. in Gay, Hist. de Chile, Zool. III, 1849, 216; Crust. Lam. 1, fig. 7. 
Rhynchocinetes typicus, Dana, U. 8S. Expl. Exped. Crust. XIII, I, 1852, 568, Pl. xxxvi, 
flees Jip 
Descr. The following description is based upon the male: The entire length, from the tip of 
the rostrum to the extremity of the caudal paddles, is four inches and a quarter; the rostrum 
measures one inch and an eighth; the middle line of the cephalothorax one inch and a six- 
teenth. 
The cephalothoracic region is rounded above, compressed, deeper than broad, smooth, with 
the exception of the anterior extremity, which is provided with eight acerated points ; two of 
which being situated upon the middle line, and one immediately above the base of the rostrum : 
