CRUSTACEA. 
11 
4. HYASTENUS, White. 
Thorax suboblongus, ad latera rotundatus, ante et pone oculos directus; parvo, transverso sulco in 
superiore cantho. From duobus cornibus tboracem longitudine sequantibus, primo parallelis, posterius 
divergentibus et paululum deorsum directis ; antennis exterioribus omuibus articulis cylindricis ; inser- 
tione articuli basalis comu frontali occultata. ( , 
Chela graciles, secundo pari pedum majori longitudine, gracillimo ; articulo terminali acie spinosa. 
Carapace rather oblong, rounded on the sides behind, before and behind the edges 
straight ; a slight transverse groove in the upper orbit ; front with two horns as long as the 
carapace, at first parallel, and then diverging, and directed slightly downwards ; outer 
antennae with all the joints cylindrical ; the insertion of the basal joint concealed by the 
frontal horn. 
Fore-legs slender ; second pair of legs the longest, and very slender ; terminal joint tvith 
the edge spined. 
A genus allied to Ilyas and Chorinus, the only species of which was long ago figured in 
the large work of Seba. 
1. HYASTENUS SEB2E, White. 
Superficie superiore subaspersa et pube velata. 
Far. Philippine Islands. 
Upper surface somewhat roughish, and covered with a delicate down. 
Hab. Philippine Islands. 
Hyasterms Seba, White, List of sp. of Crust, in Brit. Museum ; Cancer aranews, cornutus alter, Seba, 
Thes. 3. 4. 5. t. 18. f. 12. 
5. CHORINUS, Leach. 
[ i. CHORINUS ACANTHONOTUS, Adams fy White. Tab. I. Pig. 1. 
Thorace quatuor longis spinis armato duabus anterioribus ad basin sese adpropmquantibus atque 
paululum proiectis, posterioribus bifidis ; furcis anterioris spinarum posteriorum laterahter divergentibus, 
posterioris longitudinal iter ; tribus spinis in utrfique brachiali regione ; anteriorc projects., honzonta ter 
depress!! • media gracili retrorsum, sursum et extrorsum project!! duobus acutis tuberculis ad basin deorsum 
spectautibus: posteriore duabus divaricantibus gracilibus spinis retrorsum et sursum chrectis. 
Rostra cornibus longis depressis, ad basin conjmctis, paulatim divergentibus et deorsum curvatis. Can- 
thorurn marginibus ad partem superiorem long!! bifida spina armatis, ad antenorem brevi bifida spina, et ad 
posteriorem, brevi spin!! prorsum curvatd finitis; cantliorum margine mlenore lere obsolete, angulo 
extemo in acute dentali processu desineute. . . . 
Chdiset supra et infra crista acuta denticulatd armatis; pedibus cylindricis, duobus spinis longis 
praeacutis instructis, uua in utroque latere superioris partis extremitatis articulorum disposita, sursmn et 
extrorsum tertiorum divergente. Tarsis longis curvatis, infra lawibus. Corpore longis tenuibus setis co- 
operto. 
Far . Maria Orientalia ; Borneo (Unsang). 
Carapace armed with four long spines, the two front ones rather close together at their 
