^6 



.sliglitU' reaching heydiid the latter; terminal joint imperfectly developed, 

 knob-like. Anterior gnatliopoda slender, propodos narrow, tajiering, witliont 

 any distinctly defined jialniar edge. Posterior gnatliopoda »i' the nsnal strnc- 

 tnre, propodos oval, very sliglitlv produced l)eneatli the minute dactylus. 

 Pereiopoda com])aratively shoi-t, dactylus very small, basal joint of the ?> 

 posterior pairs lai-ge and laminar. Pleopoda normal. Last pair of nrojjoda 

 comparatively short, scarcely reaching beyond the preceding pair, inner rannis 

 nnich smaller than outer. Telson of moderate size, deeply cleft. 



llemarl's. — The present genus agrees with the o jtreceding ones iu 

 the structure of the anterior gnatliopoda, but differs materially Ijy tlie devia- 

 ting form of the epistome, as also in the structure of the oral parts. From 

 Lysianassa it is further distinguished by the deeply cleft telson, and from 

 both that and the other two genera by the ]ioor development of tlie last pair 

 of uropoda. It may be that the 2 Mediterranean sjiccies, Anony.v Siiiardo' and 

 f/licornis, described by Heller, belong to this genus, as suggested by Boeck, 

 but, on the other hand, I cannot coincide with the Pev. Mr. Stebbing in 

 referring to this genus tlie form he deseriljcs from the ('luillenger Expedition 

 as Amlab-ia integriccmda. For the latter foi-m \\-ould seem to ditfer very ma- 

 terially from the typical species in several characters usually regarded as of 

 generic value, for instance in the form of the telson and especially in the 

 very anomalous structure of the pleopoda. 



'.I. Ambasia Danielsseni, P>()eck. 



(PI. 17, fig. 1). 

 Ambasia Danielsseni, Boeck, Crust. amiih. bor. & arctica, p. 17. 



Body moderately slender, with the Ijack evenly rounded. Cephalon 

 rather deep, lateral corners produced and almost rectangular. First pair of 

 coxal plates much smaller than the succeeding ones and partially covered by 

 the same, the latter nearly three times deeper tlian the body; 4th jiair con- 

 sideral)ly dilated inferiorly and exhibiting behind a sharp angular corner; 

 5th pair about as deej) as l)i-oad. Tliird pair of epimeral plates of metasome 

 rounded posteriorly, with a very small upturned dentiform projection at the 

 inferior corners. Fir.st segment of urosome provided dorsally with a high 

 compressed triangular expansion. Eyes narrow, subsigmoid, occupying nearly 

 the entire height of the ceplialon, pigment a beautiful red. Sa])erior antenna? 

 witli the 1st joint of the ]ieduncle vcr_y large and liulging out ant(>riorl\-, the 

 2 succeeding ones extremeh' small; Hagellur.i composed of 7 juints, the 1st 

 of which is ver}- large, nearlj- twice the length of the others cond)ined; 

 accessory a])pendage scarcely exceeding the 1st joint of the flagellum, 



