548 THE VOYAGE OF H.M.S. CHALLENGER. 



Second pair of antennae having a scaphocerite that is a little longer than the 

 peduncle of the first pair. 



First pair of pereiopoda having the larger hand broad and long, obliquely attached 

 and laterally compressed, the upper margin indented a little behind the dactylar hinge, 

 from which indentation a longitudinal groove runs back on the inner and outer sides and 

 gradually dies out towards the posterior or carpal extremity. The hand upon the left side 

 is broken off in all the specimens in the collection. The four following pairs are also want- 

 ing in our type specimen, but in the others they exhibit no specially noticeable feature. 



The telson is short, broad and ovate at its posterior extremity, which is fringed with 

 hairs. 



Habited. — Bermuda, shallow water. Three specimens ; one male and two females 

 of which one bears mature ova. 



St Thomas, West Indies. A damaged female, laden with ova, which appears to 

 belong to this species. 



Observations. — I cannot identify this form with any species known from the 

 western shores of the Atlantic, or with any in Kingsley's Synopsis of the North 

 American Species, but it corresponds with Alpheus avarus of Fabricius more nearly 

 than with any other form. The female specimen, which is laden with ova, has lost both 

 its chelae ; it is longer and stouter than the others. 



Alpheus crinitus, Dana (PL XCvTII. fig. 2). 



Alpheus crinitus, Dana, U.S. Explor. Esped., Crust., p. 548, pi. xxxiv. fig. 8, a-f. 



Eostrum short, scarcely reaching beyond the orbital lobes, which are prominent but 

 without frontal teeth. 



First pair of antennae having the three joints of the peduncle subequally short, 

 upper flagellum not longer than the peduncle, the lower being a little longer and more 

 slender than the upper. 



Second pair of antennae having the peduncle a little longer than that of the first, 

 and the outer tooth of the scaphocerite quite as long. 



Second pair of gnathopoda reaching as far as the distal extremity of the peduncle 

 of the second pair of antennae. 



