MYSIDEA. g 3 g 



G. 3. Myto.*— Pedes thoracis quatuordeeim, primi secundi tertii quartique pal- 

 pigeri, quinti sexti septimi simplices. Appendices caudales segmentoque caudali 

 connati, ideoque cauda late triangulata, margine postico longo. Flagella anten- 

 narum internarum non articulata. 



Fam. III. LUCIFERLD^. 



G. Lucifer, Thompson.— Antennae interna simplices, esterase squama basali in- 

 structs. Pedes thoracis quatuor postici (ad segmenta normalia pertinentes xiii. 

 xiv.), obsoleti; octo precedentes (ix. x. xi. xii.), elongati, setigeri; deinde duo 

 antici (vm.), instar maxillipedum flexi. Maxillipedes duo (vii.); maxillae quatuor 

 (v. vi.) ; mandibular (iv.) duae non palpigerae. 



APPENDIX TO THE MYSIDEA. 



The following genera are retained provisionally for certain imma- 

 ture forms, which may be young of Macroura : — 



a. Podopsis, Thompson (Zoological Researches, i. 59, tab. 59, fig. 1). Oculi lon- 

 gissimi. Antennae internae fere obsoletae; secundae lamina instruct®. Pedes duo 

 longissimi, articulo tenui annulato confecti; reliqui breves. Pedes abdominis 

 natatorii. 



G-. Furcilia, Dana. — Carapax plus minusve rostratus. Oculi aperti. Pedes abdo- 

 minis bene natatorii. Antennae internae furcatae, ramis (immaturis ?) subaequis 

 1-2 articulatae"; segmentum abdominis posticum truncatum, extremitate saepius 

 spinulosum. Animalia in mari alto lecta. 



Gr. Calyptopis, Dana. — Carapax non rostratus, oculos omnino tegens. Antennse 

 internae birameae, ramis (immaturis?) subaequis, 1-2 articulatis. Segmentum ab- 

 dominis posticum truncatum, extremitate saepius spinuloso. 



Family I. EUPHAUSHLE. 



Genus EUPHAUSIA, Dana. 



Oculi breves, orbiculatl Antennce internee flagellis duobus confectce, 

 externce squama basali instructs. Pedes tlioracici numero duodecim 

 quatuor posticis obsoletis branchiis eorum exceptis, 6-articulati, tenues 



* Krbyer, Tids. N. R., i. 470. 



