842 I'ROCKEDINGS OF THE NATIONAL MUSEUM. 



Pamily VIII. SEliOLIDiE. 



16..SEROLIS Leach. 

 34. SEROLIS CARINATA Lockington. 



Serolis carivata Lockinoton, Proo. Cal. Acad. Sci., VII, 1877, Pt. 1, p. 36 

 Habitat. — San Diego, California. 



Fig. 19.— Serolis cabinata Lockinoton. y 8. 



III. VALVIFERA. 



ANALYTICAL KEY TO TIIK FAMILIE.S OF VALVIFKRA. 



a. Body more or less broad, depressed. Legs usually nearly alike, but first three 

 pairs sometimes with propodus dilated and dactylus rellexed. 



Family IX. Idoteid^e (p. 842). 



a'. Body narrow, scarcely depressed. Four anterior pairs of legs unlike three pos- 

 terior pairs, and not ambulatorj^, nor strictly prehensile, directed forward, 

 slender, ciliated, with terniinal joint minute; last three pairs are stouter, 

 ambulatory, with terminal joint bifid Family X. Akcturid^ (p.853). 



Family IX. IDOTEID J^. 



ANALYTICAL KEY TO THE GENERA OF lOOTEID^C.' 



a. Sides of head emarginate or cleft and laterally produced beyond eyes, which are 

 situated upon its dorsal surface. Three anterior pairs of legs, with pe- 

 nultimate joint or propodus dilated and forming, with reflexible dactylus, 

 a prehensile hand 17. Glyptonotus. 



a'. Sidi's of head in a dorsal view entire and not laterally produced. Eyes lateral. 

 Legs all ambulatory; three anterior pairs with penultimate joint not or 

 not much dilated. 

 b. Flagellum of second pair of antennai well developed and multiarticulate. 

 c. Palpus of maxillipeds four-jointed. Epimera of all the segments well 

 developed and evident in a dorsal view. Abdomen^ consisting of three' 

 segments with lateral sutures, indicative of another partially coalescent 

 segment 18. Idotea. 



' See Miers on the Idoteidai, Journ. Linn. Soc. London, XVI, 1883, pp. 9, 19, 20. 

 ''Including terminal segment. 



^Dollfus, Feuille des Jeunes Naturalistes, 3d ser., 1895, p. 4; Sars, Crust, of Nor- 

 way, 1897, Pts. 3, 4, p. 79. 



