PENEUS BALBOiE. 181 



with light and darlv color, and there are traces of color on the margins of the 

 rostrum, on the dorsal carinte and on the appendages. 



This species resembles ^S'. Iwms Bate, from the region north of New 

 Guinea, but may be easily distinguished from that species by the teeth 

 on the margins of the abdominal pleurce. Other differences are apparent on 

 comparing Bate's figure of *S'. Iwiis with the figure of S. inda on Plate 

 XLVI. 



PENEUS Fabr. 



Suppl. Eut. Syst., pp. 385, 40S, 1708 \_Penmi!<\ 



Peneus balbose Fax. 



Plate XL VII., Fig. l-V. 



Bull. Mus. Comp. Zool., XXIV. 211, 1893. 



Integument thin and membranaceous, its surface, when viewed through 

 a lens, thickly beset with minute squamiform tubercles. The rostrum of the 

 unique type specimen is broken off a little short of the anterior limit of the 

 eye ; on the upper margin of the part remaining, and on the median line of 

 the gastric region, there is a series of eight slender, acute teeth, three of which 

 lie behind the orbit ; the intei'vals between the teeth are ciliated, and the 

 lower margin of the rostrum is also furnished with long cilia. The rostrum 

 is continuous posteriorly with a sharp, non-sulcated carina, which becomes 

 obsolete before reaching the posterior margin; the anterior, dentate moiety 

 of the dorsal carina is very thin, and sharply defined below. The antero- 

 lateral border of the carapace is ciliated ; the suborbital angle is prominent, 

 but not armed with a spine ; a small brachiostegal spine projects from the 

 margin, on a level with the second antenna3. Neither the cervical nor any 

 other groove of the carapace is apparent. A faintly marked longitudinal 

 ridge runs along the side of the carapace, on a level with the orbit; this 

 carina is most consjncuous on the gastric region, becoming obsolete before 

 attaining either the anterior or posterior margin of the carapace. Another 

 longitudinal ridge runs from the suborbital angle, dividing into two branches 

 near the middle of the carapace ; the upper branch defines the upper limit 

 of the branchial area, the lower branch trends diagonally, and then horizon- 

 tally backward, fading out before attaining the posterior border of the carnpace. 

 A third ridge extends from the branchiostegal spine to the lower branch 

 of the ridge last described. The fourth, fifth, and sixth abdominal segments 



