Rev. T. R. R. Stebbing on AmpMpodous Crustaceans. 345 



and specially of Ampliipodous, Crustaceaus. It is much to be 

 wished that his Museum Catalogue of Amphipodous Crusta- 

 ceans were supplemented by a similar volume on the Isopods 

 of the world at large. 



In ProhoUum Spence-Batei the upper antennae are very 

 slightly the shorter, the middle articulation being the longest 

 of the three that form the peduncle, the last articulation of the 

 peduncle being rather shorter than the first of the flagellum. 

 In the lower antennae the last articulation of the peduncle is 

 the longest, narrowing rather sharply towards the distal end ; 

 its predecessor is somewhat shorter and thicker. The flagella 

 of these, as of the upper antenna?, are slight, with about five 

 articulations. The eyes are black, of moderate size. With 

 some difficulty the incised edges of the first coxte may be seen 

 through the partially transparent second coxse that overlie them. 

 The first and second gnathopods are alike, except that the 

 second pair have the advantage in point of size. Of these 

 limbs, the hands are, roughly speaking, oblong, with a ten-' 

 dency towards an ovate shape at the base ; the front margin 

 is gently curved, the hinder margin very sliglitly sinuous. 

 The palm is at right angles to these margins, having a very 

 slight curve, but wdth the angle well rounded off" where it 

 meets the hinder margin, and surmounted by two short spines ; 

 along a line which runs quite straight from these spines to the 

 insertion of the finger are set at intervals some four or five 

 very delicate spines ; the exceedingly delicate arc, of which 

 this line forms the chord, is finely serrated or pectinate, the 

 appearance presented being that of finely engraved lines 

 parallel to one another, of which four or five occupy each of 

 the spaces between the spines just mentioned at the edge of 

 the circumference, but do not reach to the chord. The wrist 

 is produced along the lower margins, and surmounted at the 

 blunt apex by two or three cilia. 



The telson is boat-shaped, the margin rising highest near 

 the middle of each side. The rami of the last pleopoda were 

 missing ; their peduncles seemed rather peculiar in not being 

 completely tubular, but open above at the distal end. The 

 penultimate pleopoda have the branches slight, the inner being 

 the longer of the two. In the antepenultimate pleopoda the 

 peduncles are very long ; the rami long and slender, equal to 

 one another, not so long as the peduncle, the inner branch 

 bearing three very small spines. 



In colour there is nothing to notice but some orange-red 

 dots scantily sprinkled on the third cox^,, and rather thickly 

 on the fourth and broadest ; a few small and faint ones could 

 also be discerned on the thighs of the third pair of pereiopoda. 



