106 ALPHEUS LAEVIS. 



whether our three other specimens ') , which , according to 

 that author, on account of the shape of the smaller hand 

 should be referred to the strenuus Dana, are male or fe- 

 male, hut they are not provided with eggs. Except in 

 the shape of the smaller hand and of the second joint of the 

 abdomen (Hilgendorf , 1. c. p. 831) , these specimens however 

 xoholly agree in all respects with the four other specimens of 

 the true edwardsii in our collection , as regards the relative 

 length of the legs of the second and third pair and the relative 

 proportions of the joints of the carpus. Might it there- 

 fore not be possible that the described differences in the 

 shape of the smaller hand and of the second joint of the 

 abdomen must be regarded as sexual ones? This is how- 

 ever only a mere supposition. I however will add still 

 this: according to the diagnose of the Alpheus stre- 

 nuus by Dana, the second joint of the peduncle of the 

 internal antennae should be almost twice as long as the 

 first , and- the first and the second joint of the carpus should 

 be nearly equal : in our three specimens however , fwhoUy 

 agreeing in these points with the four ediüardsii-s])ecivienfi), 

 the second joint of the peduncle of the internal antennae 

 is but little longer than the first joint, and the first joint 

 of the carpus is distinctly much longer than the second 

 joint. I therefore am inclined to presume the true stre- 

 nuus Dana to be a species different from our form , and 

 the latter to be the male of the Alph. edwardsii Aud. 



Alpheus laevis Randall. 



More than 60 fine specimens , of which the half females , 

 were collected. This species is therefore very common 

 on the Djeddah shores, but it is recorded from the 

 whole Indo-Pacific region. In nearly all our specimens , 



1) These specimens entirely agree with an Alpheus, presented by Mr. Koss- 

 mann to our Museum under the name of Alpheus crassimanus Heller. But 

 I think the Alpheus crass'unanus Heller to be a quite different, though allied 

 species. 



^otGH from the Leytlen Museum, Vol. III. 



