658 CLASS x. 



Primno GUISRIN. 

 Themisto 



See GU^RIN Mm. de la Soc. d'Hist. not. de Paris, iv. pp. 379386, 

 PI. 23 ; KROEYER Qrcenl. Amfip. pp. 63 68, Tab. iv. figs. 16, 17. 



Phrosma Bisso, Dactylocera LATR. 

 Anchylomera EDW. 

 Eieraconyx GUERIN. 



Hyperia LATR. Antennae four. Feet slender, terminated by 

 an incurved hook. Trunk broad, gibbous above ; tail attenuated. 



Lestrigonus EDW., Tyro EDW., Phorcus EDW., Hyperia EDW., 

 Metoecus KROEYER. 



Sp. Hyperia Latreillii EDW., Ann. des Sc. not. xx. PI. n, figs, i 7, 

 GU^RIN Iconogr., Crust. PI. 25, fig. 5 ; Hiella Orlignii STBAUS-DURCK- 

 HEIM, M6m. du Mus. xvm. 1829, PI. 4. 



Note. Genus Daira EDW., is distinguished by having only two 

 short antennae, and by the second pair of feet being didactylous. 

 Metoecus KROEYER, furnished with four short subulate antennae, 

 differs from the other Hyperice by the first and second pairs of feet 

 being shorter and terminated by a didactylous chela. Grcenl. 

 Amfip. pp. 6063, Tab. iv. fig. 15. 



Family XXIII. Gammarina. Foot-jaws large, conjoined at 

 the base, forming an accessory inferior labium, covering the ciba- 

 rious organs; cloven anteriorly into two laminae, and on the outside 

 sustaining an articulate palp. Last caudal feet terminated by 

 appendages styliform, more rarely foliaceous, not resembling a fin. 

 Head congruous. 



Comp. H. KROEYER Nye nordiske Slcegter og Arter, henhorende til Fami- 

 lien Gammarina. Tidsskrift. iv. 1842, pp. 141 166. 



A. Lateral parts of segments of trunk (epimera) moderate, not 

 covering the bases of feet. Abdominal feet six ; the last terminated 

 by two small oval laminae. 



Vibilia EDW. 



Corophmm LATR. Two inferior antennae large, thick, pediform. 



Sp. Corophium longicorne, Cancer grossipes L., Oniscus volutator PALL., 

 Miscell. Zool. Tab. iv. fig. 20, Spic. Zool. ix. Tab. 4, fig. 9, GRONOV. 

 Zoophylac. Tab. xvn. fig. 7, GURIN Iconogr., Crust. PI. 27, fig. i. 



