50 CARL BOVALLIUS, THE OXYCEPHALIDS. 



carpus of the second pair is about twice as long as it is broad at the 

 lower end; the free part of the under margin is quite half as long as 

 the hind margin of the metacarpus; the lower hind corner is angular; 

 the dactylus is about half as long as the metacarpus. The fifth pair are 

 a little longer than the whole perseon ; the femur is more than twice as 

 long as broad, as long as the three following joints together, and about 

 twice as long as the metacarpus. The femur of the sixth pair is ovate, 

 nearly twice as long as broad, and about as long as the three follow- 

 ing joints together; the carpus is more than half as long as the ti- 

 bia, and only a little shorter than the metacarpus. The seventh pair 

 reach to the under margin of the genu of the sixth pair. 



The first two pleonal segments together are shorter than the last 

 five perseonal segments together. The lateral parts of all the pleonal 

 segments are rounded below and behind. 



The first segment of the urus is shorter than the last coalesced, 

 which is shorter than the telson. 



The rami of the first and second pairs of uropoda are elon- 

 gate-ovate; the inner ramus of the third pair is falci-form, and the 

 outer narrowly elongate. 



COLOUR. Faintly red, almost hyaline, with black or very deep red spots 



all over. 

 LENGTH. My largest specimen measured 7 mm, the smallest 5 mm, all were 



males; GLAUS gives 7 mm for his specimens. 

 HAB. GLAUS records the animal from Zanzibar, and from the Pacific; I 



have taken it in the Bay of Panama* in 1882. 



2. Siniorhynchotus StefoMngi, n. sp. 



The name is given in honour of the Rev. THOMAS R. R. STEBBING. 



Diagn. The head, with the rostral prolongation, is a little longer than 

 the first five personal segments together. The rostral part 

 is somewhat narrowed, and rounded at the apex. 

 The lower front corner of the first flagellar joint of the first 

 pair of antennae in the male is produced into a process, which 

 is less than half as long as the breadth of the joint. 

 The perceon is scarcely longer than the first two pleonal seg- 

 ments together. 



