512 APPENDIX. 



Eyes not recognizable in specimens that have reached us. 

 Superior antennae longer than the inferior, having a small tri- 

 articulate secondary appendage ; inferior antennae having the 

 peduncle longer than the peduncle of the superior. Gnatho- 

 poda subequal and similar, having the inferior margin and 

 palm furnished with long cilia. Dactylos long and slender. 

 First two pairs of pereiopoda subequal and of moderate 

 length ; third pair not longer than the preceding ; fourth pair 

 about one-third as long again; fifth pair longer than the fourth; 

 posterior pair of the pleopoda subfoliaceous and ciliated. 

 Telson single, but cleft deeply, so as to appear double. 



We have received one or two specimens from Mr. Jeffreys, 

 who dredged them off the Shetlands. 



