8 CARL BOVALLIUS, NEW ISOPODA. III. 



The second pair (Pl. I, fig. 13) reach a little beyond half 

 the tirst pereional segment; tliey are a little longer tlian the 

 lirst pair, and, except the basal joint, more slender. The 

 iirst joint is thick ovate, as long as the second, the succeed- 

 ing live joints are subcqual, the last feebly hent forwards, 

 without liairs. 



Tlie labrum is thick, semicircular. 



The mandibles (Pl. I, fig. 14) are comparatively narrow, 

 the free end thicker, hent in an obtuse angle, the inner side 

 excavated, endiug in a goiige-like tooth, with two small pro- 

 minences below. The palp is short hut very robust, the lirst 

 joint very thick and broad, longer than the two succeeding 

 together, the second joint is not half as broad as the hrst, 

 bnt twice as long as the last, which is rounded at the tip, with- 

 ont hairs. 



T\\G first pair of maxillce (Pl. I, fig. 15) are styliform, simple, 

 armed at the apex with three spine-like teeth, feebly cnrved at 

 the tips. 



The second pair (Pl. I, fig. 16) are thick, robust, a little 

 fiattened at the anterior side; the free end forming a small 

 head excavated at the inne side, and armed with two short, 

 hook-like teeth; in the excavation is inserted, a rounded, pillow- 

 like joint armed with a hook-like tooth. 



The ma.villipeds (Pl. T, fig. 17) are robust, the last joint 

 conical, armed with two small, hook-like teeth. 



The pereion is very dilated, almost totally fiat, the posterior 

 corncrs of the segments are strongly produced. The first segment 

 is the lonöest, almost as lono^ as the last two ones together, 

 the anterior margin is distinctly tri-sinuated, the median sinus 

 deeper than the lateral; the hinder margin is semicircular, 

 the produced corners are very long, fiat, feebly bent back- 

 wards, almost roaching to the ends of the corners of the second 

 segment. The second to fifth segments are sube(|ual in length, 

 the sixth and seventh a little shorter, suboqual. Tlie posterior 

 produced corners of the second and third segments are the 

 shortest, the following increasing in length backwards, the 

 ones of the seventh segment are the longest, reacliing beyond 

 the superior corners of the last plconal segment. The colour 

 of the pereion is ycllowish brown with dark brown spöts borde- 

 ring the hinder margins of the segments, and two parallel, obscure, 

 black bands from the fifth segment down the sides of the 



