56 DISCOVERY REPORTS 



Maxillipede 3 very long, reaching beyond base of rostrum. Pleopods large, simple. 

 Exopod of uropods about ten times as long as wide, the setose part 17 times as long as 

 bare part. Mandibular palp absent. 



Fig. 47. S. vigilax. Acanthosoma 3. 



Fig. 48. S. vigilax. Mastigopus i. 



Mastigopus I (Fig. 48). Length 4-0 mm. 



Rostrum as long as segment i of antennular peduncle. Carapace with small supra- 

 orbital and hepatic spines. The lateral spines may be entirely lost, or represented by 

 minute vestiges. Posterior dorsal spine rather large. 



