46 



slightly reaching beyond the latter; terminal joint imperfectly developed, 

 knob-like. Anterior gnathopoda slender, propodos narrow, tapering, without 

 any distinctly defined palmar edge. Posterior gnathopoda of the usual struc- 

 ture, propodos oval, very slightly produced beneath the minute dactylus. 

 Pereiopoda comparatively short, dactylus very small, basal joint of the 3 

 posterior pairs large and laminar. Pleopoda normal. Last pair of uropoda 

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

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



ItcwarliS. - The present genus agrees with the 3 preceding ones in 

 the structure of the anterior gnathopoda, but differs materially by the devia- 

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

 Li/x/(tiHi**a it is further distinguished by the deeply cleft telson, and from 

 both that and the other two genera by the poor development of the last pair 

 of uropoda, It may be that the 2 Mediterranean species, Anonyx S-mardce and 

 filicot')iis. described by Heller, belong to this genus, as suggested by Boeck, 

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

 referring to this genus the form he describes from the Challenger Expedition 

 as Anilxtxia hitfyricfnida. For the latter form would seem to differ 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, 



'.. Ambasia Danielsseni, Boeck. 



(PI. 17, fig. 1). 

 Ihniielsseiii, Boeck, Crust, amph. bov. iS: aretica, p. 17. 



Body moderately slender, with the back evenly rounded. Cephalon 

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

 ''ixal plates much smaller than the succeeding ones and partially covered by 

 the same, the latter nearly three times deeper than the body; 4th pair con- 

 siderably dilated interiorly and exhibiting behind a sharp angular corner; 

 f>t li pair about as deep as broad. Third pair of epimeral plates of metasome 

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

 inferior corners. First segment of nrosonie provided dorsally with a high 

 compressed triangular expansion. Kyes narrow, subsigmoid, occupying nearly 

 ilic entire bright ol' the crphalon, pigment a beautiful red. Superior antennae 

 \vith the 1st joint of the peduncle very large and bulging out anteriorly, the 

 succeeding ours extremely small; tlagrlluni composed of 7 joints, the 1st 

 of which is very large, nearly twice the length of the others combined; 

 accessory appendage scarcely exceeding the 1st joint of the flagellum, 



