CRUSTACEA. 
61 
oblong, and a sharp elongated trigonal claw ; the third tibia subtriangular, the tarsus short, 
flattened, trigonal, with a falcate claw ; the fifth tibia triangular, very short, flattened ; tarsus 
transversely ovate, with a small narrow claw. 
Abdomen (of male) seven-jointed, the joints from the first to the sixth nearly of the same 
width as in Not opus, the last joint trigonal. 
Hab. Borneo (Unsang). 
Cosmonotus differs from Notopus, De Haan, in wanting the post-frontal, elevated denti- 
culated ridge; in the dorsal keel ending abruptly in front, instead of terminating in a 
central frontal spine ; in the front being notched, with a single spine on each side ; in the 
carapace being much compressed, more especially in front, and in the produced and angular 
form, while in Notopus it is almost straight across the front ; and in the sides being entire, 
with a short sharp spine at the antero-lateral angle. The species is named in compliment to 
J. E. Gray, Esq., F.U.S., Keeper of the Zoological department in the British Museum. 
XII. PENiEIDiE. 
A new species of Sicyonia, Edwards, of a scarlet colour, finely variegated with orange 
and yellow, with a greyish pubescence on the dorsal surface near the crest, was obtained in 
the Sooloo Sea together with a few Zorece. The Stenopus, Sicyonia, and PencBiis, usually 
swim in a slow and deliberate manner forwards, and occasionally with a sudden jerk propel 
themselves backwards. They keep at a considerable distance from the shore and seem 
to love deep still water, never appearing when the surface of the sea is ruffled. 
1. STENOPUS, Latreille. 
1. STENOPUS HISPIDUS, Latreille. (Tab. Nil. Pig. 6.) 
Thorace spinis multis parvis pilisque sparsis obsito. 
Fronie acuminata gracili sursum directa, non ultra articulmn basali antennarum superiorum pertinente ; 
antennis perlongis filiformibus. 
Chelis brevioribus quam paria pedum secunda, longe ultra appendicem lamellarem antennarum infe- 
riorum porrectis. Pari tertio pedum longiore quam totum corpus multis seriebus longitudinalibus dentium 
acutarum, tarsis duorum parium ultimorum pedum bifidis. 
Abdomine lamina media pinnae caudalis in centro sulcato, supra seriebus duabus spinarum. 
IIab. Insulas Philippinas. 
Stenopus hispidus, Latr. E. A. vol. iv. p. 93. Cuv. E. N. (Crock), t. 50. f. 2. Edw. Crust, vol. ii. 
p. 407. t. 25. f. 1. Salomon hispidus , Oliv. Enc. vol. viii. p. 666. Seba, vol. iii. t. 21. f. 617. 
Carapace covered with numerous small spines and scattered hairs. 
Front pointed, slender, elevated, not extending beyond the basal joint of the upper 
antennae ; antennae very long and filiform. 
R 
