244 
PROCEEDINGS OF THE ACADEMY OP 
margini approximata. Frons horizontalis, lamiaata, valde prominens, tridentata, 
dentibus acutis, dente mediano majore et magis prominente. Antennae cara- 
pace pilus duplo longiores ; articulo primo intus acuto prominente. Epimera 
oblique striato. Chelipedes sat graciles, crassi, obtusi, laeves, glabri, albi, caeru- 
leo-maculati ; angulis anticis meri ischiique productis acutis ; carpo parvo, 
marginibus laevi ; manu elongata, basi contracta, intus linea tomentosa longi- 
tudinal! ornata, intra digitos oriente ; digitis gracilibus minuentibus, quasi dis- 
tortis ; dactjlo manus majoris quara digitus immobilis raulto breviore. Pedes 
ambulatorii parvi lasves, glabri, vix setosi ; dactjlo intus quadri-unguiculato„ 
iinguiculis medianis majoribus. Abdominis segmenti ultimi pars mediana tri- 
angularis parva, paries laterales grandes. % Carap. long. 0-425 ; lat. 0-34 ; maaus 
maj. long. 0-59; lat. 0-20 poll. 
Ifab. — In portu " Hong Kong *' ; inter laminas Pcnnatularum e fundo argillaceo 
prof, sex org. acceptarum. 
302. PoLYONYX SINENSIS, nov, sp. Carapax convexus, subquadratns, angulis 
rotundatus, pallide griseus, obscuro-maculatus. Frons sat lata, leviter convexa. 
Chelipedes valde ingequales, laeves, crassi ; chelipedis majoris mero climidiam 
carpi superante, antice non dilato ; carpo quara manu vix breviore, margine 
antico dilatato : manu crassa, extus breviter ciliata, intus ad medium sparsim 
pilosa ; dactjlo quam digitus immobilis breviore ; digitis brevibus, intus leviter 
unidentatis, apicibus hamatis. Pedes ambulatorii nudi ; articulo penultimo 
subtus 1-2 spinuloso ; dactjlo tri-unguiculato, unguiculo terminali multo 
majore. Carap. long. 0-15; lat. 0-20 ; chelipedis maj. long. 0-52 poll. 
Hah. — In mari Sinensi, lat. bor. 23° ; e fundo conchoso-arenoso prof. 26 org« 
acceptus. 
HiPPIDEA. 
303. Remipes testudinarius, Latreille ; Gen. Crust, et Ins., v. i. p. 45, M,. 
Edw. ; R. Anim. Crust, pi. xlii. f. 1. — Ad oras insulae " Ousima " ; sublitto- 
ralis. 
304. Mastigopus gracilis, nov. sp. Carapax perconvexus, squalls, lineolis 
brevibus, transversis, crenulatis, breviter setosis exasperatus ; antrorsum quam 
retrorsum magis asper. Frons tridentata, dentibus acutis, mediano triangular], 
lateralibus gracilibus quam medianus longioribus. Margo antero-lateralis sex- 
dentatus, dentibus spiniformibus, retrorsum minuentibus. Oculi graciles et 
dimidiara antennularum loogitudine superantes. Antennulae tertiam partem 
carapacis longitudine adequantes. Maxillipedes externi oblongi, fere rectangu- 
lares, dimidia parte longiores quam latiores, superficie plani glabri, sparsim 
punctati. Chelipedum articuli penultimus et antepenultimus cjlindrici, laeves, 
fere nudi ; dactjlus carapace longior, setosus, 12-articulatus, articulis elongatis. 
Pedes 2di 4ti modice hirsuti, dactjlis eis Remipedis similibus. Abdominis seg- 
mentum ultimum lanceolatum, crassum, medio longitudinaliter sulcatum et 
versus basin bi-carinatum ; extremitate acuminatum. Carapax olivaceiis pos- 
tice transversim albo-fasciatus. Carap. long. 0-52; lat. 0-36; chelipedis 
long. 1-05 poll. 
Hah. — In mari Sinensi, lat. bor. 23° ; in fundo conchoso ad prof. 20 org,, 
vulgaris. 
305. HiPPA ANALOGA, Stm. ; Crust, et Echin. Pacific Coast of N. Am., p. 46; 
H. talpoidea, Dana ; Proc. Acad. Nat. Sci., Philad. vii. 175. — California. 
LiTHODIDEA. 
306. EcHiDNOCERDS ciBAUius, White ; Proc. Zool. Soc , 1848, p. 47. Annn- 
losa, pi. ii. iii. — In portu " Sitka." 
307. EcHiDNOCERUs SETiMANus, Stm. ; Crust, et Echin., etc. p. 37. Ctenor- 
hinus setimanus, Gibbons. —California. 
[Dec. 
