68 



DISCOVERY REPORTS 



Gnathopod i, palm slightly convex, crenulate. 

 Peraeopod 3, 2nd joint strongly expanded into a rounded lobe. 

 In other respects, including presence of an accessory branchia on segments 5 and 6, 

 like navicula. 



Remarks. Considerably larger than any of the other species (including also pingnides 

 and franklim). The specific name refers to the 2nd joint of peraeopod 3, the carinae on 

 segments 4 and 6, and the distinct lobes of the telson. 



Genus Orchomenella, G. O. Sars. 



Sars, 1891-95, p. 66, and p. 73 (Orchomenopsis). 

 Stebbing, 1906, p. 81, and p. 83 (Orchomenopsis). 



m 



Fig. 27. Dorsal profiles of pleon segments 3 and 4 (also segments 5 and 6 in a) of species of Orchome- 

 nella and Orchomenc. a. Orchomenella acanthurus, Schell. b. abyssorum (Stebb.). c. rolundifrons, n.sp. 

 d. macronyx, Chevr. e. rossi (Wlkr.). /. charcoti (Chevr.). g. cavimanus (Stebb.). /;. zschauii (Pfr.). 

 i. nodimanus (Wlkr.). ;'. pinguides, W\kr. k.franklini, Wlkr. /. chelipes, Wlkr. m. Orchomene goniops, W\kr. 

 (Figs, i-tn are from drawings from the type specimens in the British Museum kindly made by Dr I. Gordon.) 



As Stebbing says in his key (1906, p. n) there are no constant differences between 

 the two genera, and with the discovery that O. zschauii possesses a projecting epistome 

 together with the 2nd antennae considerably longer than the 1st antennae, the differences 

 hitherto relied upon are obliterated. 



