14 BOVALLIUS. NEW ISOPODA. 



The head is triangulär, tlie front rounded at the tip with 

 straiglit, not excavated sides. The head is only a little broader 

 than long (8 : 7), the surface is smooth. 



The eyes are small but very distinct, triangulär, situa- 

 ted uncommonly near the middle line of the head (Pl. III. 

 lig. 26). 



The first pair of antennce. are very stout aud thick, without 

 any distinction between peduncle and ilagellum, seven-jointed, 

 the third joint being very broad and swollen, the fourth to 

 the seventh tapering towards the end, but very robust. The 

 whole antenna is somewhat compressed from the sides. When 

 extended backwards, they do not reach över the anterior mar- 

 gin of the first segment of the pereion (Pl. III. fig. 26). 



The second pair of antennce are a little more slender than 

 the first, of the same length, nine-jointed; the fourth and fifth 

 joints are the longest, equal; the three last ones are the smallest, 

 slender, tapering towards the end. Both pairs of antennse want 

 hairs or bristles. 



The mandihles are small, curved, with a short robust three- 

 jointed palp. 



The maxillce are provided with broad, thin, laminar ex- 

 tensions. 



The maxillipeds consist each of a strong thick peduncle 

 provided with a broad convex lamina, fringed with short hairs 

 at the anterior margin. These lamina? protect the mouth as a 

 large lid. On the tip of the peduncle is a short three-jointed 

 palp. (Pl. III. fig. 27). 



The pereion. The first segment is quadrangular, a little 

 broader than long (15 : 13), somewhat compressed, convex. The 

 anterior margin is rounded, the posterior a little protruding in 

 the middle. The sides are nearly straight with the anterior 

 corners extended, flattened, ear-shaped. The posterior corners 

 are rounded. The second, third, and fourth segments are equal in 

 length, increasing in breadth. The hinder corners of the second 

 and third are truucated, those of the fourth nearly angulated. The 

 fourth segment is not twice as broad as the first (22: 13). The 

 fifth segment is the broadest, twice as broad as the first (26: 13), a 

 little shorter than the preceding, and as long as the sixth and se- 

 venth together; its upper side is more flattened, the posterior cor- 

 ners are truncated and emarginated. The sixth seo;ment is but a 

 little narrower than the preceding, with the posterior corners 



