M Y S I D E A. 679 



antennae; d, outer antennae; e, second pair of thoracic legs observed; 

 /, third pair ; g, fourth pair ; h, fifth pair. 



Atlantic, latitude 4 north, longitude 20 west. Collected, October 

 26, 1838, only one individual. 



Length, one-seventh of an inch. Colourless ; a little reddish near 

 extremity of last abdominal segment. Body slender, narrow. Last 

 abdominal segment rather longer than sixth, linear, narrowed for a 

 short distance from the apex; the longer spiuules, instead of being 

 situated at angles of apex, are at the angle where the narrowing takes 

 place, about as far from the apex as the breadth of the segment. 



The branches of the inner antennae appeared to consist of two equal 

 joints ; whole length of these antennae about three-fourths as great as 

 that of the carapax. Only six legs were seen, and these were not 

 mature. For forms, see figures e, f, g, Ti, and the drawing of the 

 animal, fig. a. The abdominal appendages were all mature, being 

 perfect natatories, with short setae. 



FURCILIA GRACILIS. 



F. microphthalmae affinis. Antennae, internes, carapace valde breviores, 

 proccssu articuli primi longiore quam articulus proximus. Segmentum 

 abdominis posticum truncatum, et ad angulos etiam paidulo truncatum, 

 spinulis apicalibus minutis cequis et ad angulos utrinque und longiore, 

 quoque remotiusculis aliis duabus. 



Near F. microphthalma. Inner antennae much shorter than carapax ; 

 process of first joint longer than next joint. Last abdominal segment 

 truncate, and angles also slightly truncate ; minute spinules at apex, 

 and at angles either side a longer spinule, also, a little distant, two 

 others. 



Plate 45, fig. 7 a, animal, enlarged; b, caudal extremity; c, inner 

 antennae; d, outer antennae; e, /, g, h, thoracic legs, in succession. 



Atlantic, latitude 30' north, longitude 17 30' west. Collected, 

 November 1, 1838, at 5 A. M. 



