20 ZOOLOGY OP THE VOYAGE OE H.M.S. SAMAEANG. 



Carapace subtrigonal, sides with two large, flattened, angular teeth before the lateral 

 spine, which is obtuse ; cardiac and ventricular region with two tubercles anteriorly, one on 

 each side of the middle line ; a vertical crest with a minute tubercle ; and behind that, a very 

 prominent, rounded tubercle, with another, rather smaller, behind it ; posterior edge of cara- 

 pace with two erect angular teeth. 



Front with three spines arising from the same plane, the middle one long, slender, bent 

 down, and grooved in the middle; lateral spines rather elevated, strong, triangular, with 

 two small tubercles between them. 



Hab. Mauritius. 



M. tuberculatus, Leach, MSS. 



4. MENiETHIUS INCISUS, Be Haan. 



Fronte bicomuta, cornibus divergentibus acutis ; regionibus ventriculi et cordis medio acute unispi- 

 nosis ; lateribus ante medium in laciniam truncatam dilatatis. 

 Hab. Japoniam. 



Front with two horns ; horns sharp, diverging, a single sharp spine in the ventricular 

 and cardiac regions, the sides anteriorly dilated into a truncated border. 

 Hab. Japan. 

 Pisa (Meneethius) incisus, De Haan, F. J. p. 98. t. 24. f. 3. (femina). 



5. MEN.ETHIUS QUADBLDENS, Be Haan. 



Fronte bicomuta, cornibus divergentibus acutis ; regionibus ventriculi et cordis convexis ; thoracis 

 lateribus bispinosis, spinis anterioribus ab spinulis canthorum posticis sinu separatis. 

 Hab. Japoniam. 



Front with two horns : horns sharp, diverging, ventricular and cardiac regions convex ; 

 sides of the carapace with two spines, the anterior spines separated from the posterior spines 

 of the orbits by a sinus. 



Hab. Japan. 



Pisa {Mencethim) auaclrklens, De Haan, F. J. p. 97. t. 24. f. 2. (mas.) 



15. HUENIA, Be Haan. 



1. HUENIA FRONTALIS, Adams 8f White. Tab. IV. Fig. 3. 



Thorace seque lato atque longo, subquadrilateraH, laevi, sine tuberculis in media linea, producto 

 et postice rotundato ; lateribus acutis, uno lato lobo, postice paululum emarginato, horizontaliter undulato, 

 antice arcuato, in medio depresso et postice elevato. 



Fronte latissima, laterabter dilatata, obtusa et antice rotundata, admodum depressfi, supra plana et infra 

 in media linea alte sulcata. 



Chelis minimis, thoracem fere longitudine adsequantibus, pedibus posterioribus non crassioribus ; brachio 

 trigonali, apice in parte superiore valida conica spina et postice duabus minoribus, verticalibus, conicis 

 spinis in carina ; carpo supra carinato, spina tuberculari in superficie superiore et minore ; manu supra 

 carinata ; carina una in medio spina et infra in valido angulari dente desinente ; tertio et quarto paribus 



