132 



Cumacea: Genus incertae sedis, 13. Oxyurostylidae, 1. Oxyurostylis 



flagellum 3-joiuted in 9 , 2-jomted in 6 juv.. accessory 3-jointed, P* and 

 3* joints veiT small. Marilliped 3, 2°*^ joint with spine-like process at medial 



apex of 2""* joint, stronger in 9 than in d. 

 Telson in d a little longer than the preceding 

 segment, length scarcely twice the breadth, evenly 

 cylindric, end truncate; in Q shorter than pre- 

 ceding segment, narrowing before the middle to 

 a rounded apex carrying about 4 setules. Peduncle 

 of the uropods much longer than the telson, and 

 in the Q than the rami, but in the 6 only a 

 little longer than the exopod, which is only a 

 little longer than the endopod; P* joint of 

 endopod not so long as the equal 2""^ and 3*^ 

 joints combined, each of the three having a 

 single lateral spine, the '6^ a long apical one. 

 Colour greyish white. L. 9 2*3 mm., d juv. 

 rs mm. 



Fig. 87. 



p. rotundatus (J i"^') Hansen, 



telson and uropods. 



Mouth of R. Tocantins, Brazil. 



13. Fam. Oxyurostylidae 



1912 Oxyurostylidae, T. Stebbing in: Ann. S. Afr. Mus., v. lOv p. 133, 146. 



Telson large, acute, without apical spines. Antenna 1 with accessory 

 flagellum small. Antenna 2 of Q 4- jointed. Palp of maxilla 1 ending in 



2 filaments. Peraeopods 1 — 4 with exopods in both sexes, but those of the 

 3'^ and 4*^ paii's in the female very rudimentary. Only 2 pairs of pleopods 

 in the male. Endopod of uropods 3-jointed. 



1 genus. 



1. Gen. Oxyurostylis Caiman 



1912 Oxyurostylis, Caiman in: P. U. S. Mas., vAl p. 605, 666 | 1912 0., T. Stebbing 

 in: Ann. S. Afr. Mus., v. 10 v p. 146. 



Telson with lateral spines along the narrow distal section. Maxilliped 



3 with 2"^ joint distally widened and produced, 3^ narrowly produced, 4*^ 

 neither expanded nor produced; with exopod in both sexes. 

 Endopod of the uropods longer than the exopod in the male. 



1 species. 



1. O. smithi Calm. 1912 0. s., Caiman in: P. U. S. Mus., 

 V.Al p. 605, 667 tf. 91— 99 | 1912 0. s., T. Stebbing in: Ann. S. 

 Afr. Mus., ulOv p. 146. 



Pseudorostral lobes meeting horizontally in front 

 of the short broad eyelobe, sinus obsolete, antero -lateral 

 corner not produced. Carapace having the frontal lobe 

 crossed by 2 prominent transverse ridges, followed in the 

 9 by 2 others much fainter: these are flanked by a pair 

 of short sinuous ridges, behind which are 2 parallel pairs 

 of large oblique ridges. All 5 pedigerous segments distinct, 

 side-plates of 3^ extended backwards in the 9 , hind 

 corners of S*'^ extended slightly and bluntly in 9 , strongly 

 and acutelv in d. Telson about once and a half the length of the preceding seg- 



Fig. 88. 



0. smithi Calm 

 maxilliped 



an, 



