g22 CRUSTACEA. 



Genus iEGINA, Krbyer. 



The character of this genus of Kroner's, derived from the length of 

 the abdomen, appears to have comparatively small importance ; a 

 strict adherence to the distinction " abdomen 2-articulatum," is not, 

 therefore, considered necessary or convenient. 



iEGINA? TENELLA. 



Corpus gracillimum. Caput fronte subacutum, sed instar rostri non 

 productum, segmento proximo paulo longius. tegmentum thoracis 

 secundum Ztio Ato 6tove brevius, aculeis mediano et postico dorso 

 armatum, tertium postice aculeatum tantum, reliqua inermia. Antennae 

 lmce tenues, dimidio corporis onulto longiores, articulo lmo dimidii 

 2di longitudine, flagello articidato, patdo breviore quam basis. An- 

 tennoe 2dce basi lmarum parce longiores. Manus 2da angusta, apwe 

 obliqud truncata, palmd non arcuatd, medio obliqud profunde excavatd 

 sparsim brevissime pubescente. Branchial par vulo3, oblongm. 



Body very slender. Head subacute in front, but not produced into a 

 beak, longer than next segment. Second segment of thorax shorter 

 than either of the three following, armed with spines on the middle 

 and posterior margin of the back ; the third aculeate at posterior 

 margin only ; remaining segments unarmed. Superior antennae 

 slender, much longer than half the body, first joint half as long as 

 second, liagellum jointed, a little shorter than base. Inferior pair 

 hardly longer than base of superior. Hand of second pair narrow 

 oblong, with a broad obliquely truncate apex ; palm not arcuate, 

 near middle obliquely excavate, a few minute tufts of pubescence. 

 Branchiae quite small, oblong. 



Plate 55, fig. 4, animal, enlarged. 



Coral reef, Sooloo Sea ; from the shores of a small island off the 

 harbour of Soung, in the large island Xolo. 



Length, half an inch. Colourless, or yellowish. Our doubt about 



