CRUSTACEA. 13 



branchial regions, cylindrical and greatly elongated, with the apex thickened, femora with 

 one spine at the end, tarsi entire at the apex. 

 Hab. Eastern Seas. 



3. CHOEINUS ACULEATUS, Edwards. 



Thorace quinque admodum longis spinis in mediana linea armato, et duabus ad utramque regionem 

 branchialem. 



Hab. Maria Orientalia. 



Carapace armed with five very long spines on the median line, and with two on each 

 branchial region. 



Chormus aculeata, Milne-Edwards, Crust, vol. i. p. 316. 

 Hab. Indian Seas. 



4. CHOEINUS "VEEEUCOS1PES, Adams fy White. Tab. II. Fig. 3. 



Thorace sex, acutis elevatis tubereulis, quinto permagno et conspicuo, parva spina ad basin utroque 

 latere ; duobus tubereulis eminentibus et angularibus in utraque regione laterali, uno minore in medio 

 alteroque in parte inferiore atque exteriore ; thoracis superficie minutis, depressis, punctis et curvatis setis 

 sparsim aggregatis obsita ; lateribus pone oculos quinque rotundatis tubereulis. 



Fronte desinente in duabus, crassis, divergentibus spinis setis curvatis obsitis superiore canthorum parte 

 tribus spinosis processibus armata ; anteriore obtuso, sursum et prorsum directo ; medio reliquis minore, a 

 posteriore profunda incisione separato, posteriore longo, dente in margine posteriore. 



CAelis lsevibuSj longitudine thoracem fere exsequantibus ; secundo pari pedum longissimo ; pedibus tenu- 

 ibus, cylindricis, tubereulis verrucosiformibus et setis crassis atque sparsis obsitis. 



Hab. Maria Orientalia. 



Carapace with six, sharp, elevated tubercles, the fifth being very large and conspicuous, 

 with a small spine at each side at the base ; two prominent angular tubercles on each lateral 

 region, with a smaller one between them, and another on the lower and outer part ; surface 

 of carapace covered with minute, depressed dots, and scattered tufts of curved setae ; sides, 

 behind the eyes, with five rounded tubercles. 



Front terminating in two stout diverging spines beset with curved setee ; upper part of 

 orbit armed with three spiny processes, the anterior obtuse, directed upwards and forwards, 

 the middle smaller than the others, and separated from the posterior by a deep incision, the 

 posterior process long, with a tooth on the hind edge. 



Fore-legs smooth, nearly equal in length to the carapace ; the second pair of legs the 

 longest ; legs thin, cylindrical, covered with wart-like tubercles, and coarse scattered setee. 



Hab. Eastern Seas. 



6. MITHRAX, Leach. 



1. MITHEAX DICHOTOMUS Latreille. 



Thorace granuloso, sine spinis in superficie superiore ; cornibus rostri admodum divergentibus paullo 

 lonuioribus quam latioribus, desinentibus in duobus dentibus qui fere sequales sunt. 

 Hab. Insulas Philippinas. 



E 



