STALK-EYED CRUSTACEA 77 



3. Macrocceloma diplacantha. 



Macrocoelouia diplaccDithax ^ . 



„ . ,. , , • • Stimpson. 



Fencer a aipiacantlia I 



Body pubescent and provided with curled hairs above. 

 Carapace subtrigonal, narrow ; back protuberant. Lateral 

 spines rather long, and double, seeming to consist of two 

 spines, one above the other, connected nearly to their 

 tips by a web-like expansion, concave anteriorly, convex 

 posteriorly. Antero - lateral margin concave, unarmed 

 except with a small hepatic tubercle. There are five 

 conical tubercles on the posterior half of the back, and a 

 few minute ones interspersed. Gastric region strongly 

 inclined anteriorly with the frontal region ; praeorbital 

 tooth obtuse and not prominent. 



Orbital tubes moderately protuberant. 



Rostrum forms nearly one-third the length of the 

 carapace ; horns very long, slender, cylindrical, acute, 

 diverging, but at base connected by a web-like expansion 

 for one -fifth their length. Spine on base of external 

 antenna; minute. 



Range. — St. Thomas. 



B. Lateral epibrancJual spine small or none : — 



4. Macrocceloma laevigata. 



Macrocceloma Icevigata . Stimpson, Miers. 

 Pericera curvicorna . . Desbonne and Schramm. 

 Pericera laroigata . . . Stimpson. 



Carapace elongated ; surface pubescent and partly 

 hairy ; hairs crispate ; back and sides smoothly rounded, 

 with no spines or tubercles except a minute one on the 



