I D O T JE I D E A. 699 



Eyes prominent, situated on the angles of the head. Inner an- 

 tennae hardly half as long as base of outer, last joint as long as two 

 preceding, very minutely setulose on the outer side. Outer an- 

 tennae nearly half as long as the body, flagellum seven-jointed and 

 shorter than the base, setae minute and rather few. 



Plate 46, fig. 1 a, animal, enlarged ; b, c, antennae more enlarged j 

 d, under view of mouth ; e, one of the legs ; /, abdominal plates. 



Taken from a Porpita, July 27, 1839; latitude 16° 50' south, lon- 

 gitude 107° 45' east. 



Length, five lines. Colour, silvery, with a bluish shade, which is 

 deeper towards the sides. 



The body is broadest at the fourth thoracic segment, which seg- 

 ment is the longest in the thorax. The outline is long elliptical, as 

 far as the abdomen ; but from the abdomen, the curving line is less 

 convergent, though the narrowing of the body continues slightly. 

 The lateral margins of the thoracic segments bear a few very short 

 hairs, visible under a high magnifier, and there are also others on the 

 last joint of the abdomen. The abdomen is rather longer than half 

 the rest of the body, and the last segment is nearly one-third the 

 length of the whole body. The facets of the eyes are square. The 

 inner antennae are a little longer than first three basal joints of outer 

 pair, the first and second joints are very short, the third is longer 

 than the second. The outer antennae have the first three joints quite 

 short, and the fourth oblong, but shorter than the fifth; the last two 

 joints of the flagellum are minute. Anterior legs shortest ; the pairs 

 gradually increase backward. The seventh pair is much more slen- 

 der than the preceding. The claw of each has a few spinules espe- 

 cially on the inner side, and the preceding joint has spinules on the 

 sides and at apex ; these spinules are bearded. 



The maxillipeds have a granulose surface; last joint subovate; 

 basal joint and lamella attached to its outer side of nearly equal size. 



Fig. 1 g, represents a young individual, probably of this species. It 

 was found on a Porpita, at the same time with the above. Length, one- 





