86 Carl Bovallius, The Oxycephalids. 



pair; the feebly produced lower corner is set with bristles on the sides, 

 the apical tooth is short and broad, but sharp-pointed; tiie metacarpus 

 is more slender than in the first pair, but armed in the same way. The 

 fifth pair are much longer than the sixth; the femur is more than 

 twice as long as broad, and considerably longer than the three following 

 joints together. The sixth pair (PI. Ill, fig. 10) have the femur 

 irregularly pear-shaped, and longer than all the following joints together; 

 the genu articulates subapically with the femur as in all the species of 

 S tre et sia, which I have examined, and is fixed on the inner side of 

 the femur so that the last five joints of the leg are entirely concealed 

 under the femur when folded up. For this reason the name pronoïdes 

 has been applied to the species, but this feature is not confined to this 

 species but common to all the species of Streetsia, as just men- 

 tioned. The front margin of the tibia is pectinated with longer and 

 shorter teeth, one long one and two short ones alternating; the lower 

 front and hind corners are produced. The seventh pair (PL III, fig. 

 11) are quite as long as the femur of the sixth; the femur is ovate, 

 not fully twice as long as broad, and distinctly longer than all the follow- 

 ing joints together. 



The pleon is somewhat shorter than the first six perseonal seg- 

 ments together. The hind corner of the third segment is not produced 

 but is angular. 



The first pair of uropoda (PI. Ill, fig. 12) reach about to the 

 apex of the last pair; the peduncle is linear, and is about five times as long 

 as broad; the rami are elongate-lanceolate; the inner is serrated on both 

 margins, and is only a little longer than the outer, which is serrated on 

 the inner margin and smooth on the outer. The second pair reach a 

 little beyond the apex of the peduncle of the last pair; the peduncle 

 is shorter than the inner ramus, which is broader, and considerably longer, 

 than the outer, both are serrated as in the first pair. The third pair 

 reach as far as two-thirds of the length of the telson; the peduncle is 

 considerably shorter than the inner ramus, and quite as long as the outer, 

 which is much narrower than the inner ramus ; both are serrated as in 

 the first pair. 



The telsoti has the margins smooth, and only feebly curved. 



Colour. Whitish. 



Length. 8 mm. 



Hab. The tropical region of the Atlantic, the Caribbean Sea. 



