T. W. Kirk. — On a New Species of Alpheus. 196 



Large hand, sometimes right, sometimes left ; three-fourths 

 the length of the animal (from tip of rostrum to end of telsou) ; 

 quadrate, superior inner angle keeled, with a line of hairs on 

 the anterior two- thirds of the length ; outer angle also keeled, 

 but not so prominently, no hairs. A very pronounced keel runs 

 down the centre of the back (outer face) of hand, terminating 

 in a swelling at the insertion of the mobile finger. Inferior 

 outer angle keeled but hairless, keel does not reach to the base 

 of the immobile finger. Inferior inner angle not keeled, but 

 with a row of stout hairs running the whole length, and con- 

 tinued on to the immobile finger, a line of minute tubercles at 

 the base of these hairs. 



Immubile finger stout, with strong and curved claw, rather 

 swollen in the middle, with five or six bristles at equal distances 

 along the outer margin, but inside the line of hairs mentioned 

 as running along the inferior margin of hand. On the inner 

 margin of this finger, and about the centre, is a deep oval pit, 

 on the posterior margin of which is a bunch of stout hairs. A 

 pair of stout hairs placed just at the curve of the claw. 



Mobile finger stout, compressed, with a large oval tubercle 

 corresponding with and fitting into the pit on the immobile 

 finger; upper edge sharp, a line of hairs along the margin ; 

 closes well within the curved hook of the other finger. 



Wrist short, swollen, anterior edge sharp but not toothed ; 

 a short stout spine, directed backwards, at the inner and outer 

 posterior margins. 



Arm triangular ; superior angle with a stout spine directed 

 forwards, situate one-fourth of the distance from the anterior 

 margin, with a few stout hairs in front and behind. Internal 

 margin terminates anteriorly in a spine, with a tubercle close 

 above its base ; four stout spines placed at equal distances along 

 the margin behind, the spines being flanked by a line of hairs ; 

 external margin sharp and very finely serrated along the entire 

 length. 



Smaller hand, fingers long, curved, hairy, meeting at the tips, 

 but not touching at any other part of their margins. Wrist of 

 second pair of legs with first joint longest. Terminal joint of 

 other legs flattened for swimming and shaped like a spear-head. 



Inches, 



Size of largest Specimen. 



From tip of rostrum to end of telson ... 1^ 



Length of carapace .. ... ... -^^y 



Greatest width of carapace ... ... ^% 



Length of largest hand (inclusive of fingers) 1-0 



Width „ „ ^% 



Thickness ,, ... ••• -^ 



Length of immobile finger ... ... 2% 



„ mobile ,, ... ... 1^% 



