P E N M I D E A. 



603 



above level of back, above seven or eight-toothed, below three- 

 toothed. Flagella of inner antennas not longer than two preceding 

 joints. Posterior thoracic legs not notably more slender than those 

 of preceding pair. 



Plate 40, fig. 2, outline of carapax, natural size. 



Singapore. 



Length to extremity of beak, seven inches ; of abdomen alone, four 

 and a half inches. This species has the long eyes, carinate back of 

 carapax, and most other characters of the setiferus, a West India 

 species. It differs, in having three teeth on the under side of the beak, 

 instead of two. 



Pen^eus avirostris. 



Rostrum rectum, extremitate anguste styliforme et non dentatum, non recur- 

 vatum, basi supra prominenter dilatatum et Q-dentatum, infra rectissi- 

 mum, integrum, squamam antennalem longitudine non superans. 

 Carapax dorso postico non carinatus nee sulcatus. Flagella anten- 

 narum internarum articulis duobus precedentibus non longiora. Oculi 

 breves. Pedes 5ti ktis multo graciliores. 



Beak straight, extremity narrow styliform and toothless, not recurved, 

 at base on upper side prominently dilated and six-toothed, below 

 quite straight and entire, whole length not exceeding that of basal 

 scale of outer antenna. Carapax in posterior part not carinate nor 

 sulcate. Flagella of inner antennae not longer than two preceding 

 joints. Eyes short. Two posterior feet much more slender than 

 those of the preceding pair. 



Plate 40, fig. 3, outline of carapax, with leg of third pair, natural 

 size. 



Singapore. 



Length of body, five inches. The beak is without teeth on either 





