84 Addison E. Verr'ill, 



same way, on the inner and distal margins with long hairs, but 

 the spinules between are larger at the outer part of the edge and 

 decrease to near the middle of the inner edge where they disappear. 

 The basal spines are short. Some hairs on the surface of the 

 inner lamella. 



The telson (fig. I, t) is rather long, width to length about I : 4, 

 widest near the base, tapering evenly to the end, with slightly 

 convex margins ; distal margin, between the lateral spines, evenly 

 rounded, and bearing about 16 long plumose hairs or setae, with 

 the same number of small acute spinules and a number of long 

 smooth hairs. Postero-lateral spines unequal, slender, acute, the 

 inner one about twice as long as the outer one. Anal tubercles 

 conspicuous. The three specimens obtained were all females 

 carrying eggs nearly ready to hatch. 



This species is so nearly allied to A. packardii that it might at 

 first be thought a dwarf deep-water form of that species. It can- 

 not be the young, as the specimens taken all have large clusters of 

 eggs. But there are some very characteristic differences, besides 

 the color. 



The antennae are much longer, exceeding the body. The eyes 

 are much larger and more prominent; the ocular hood has no 

 frontal obtuse lobe, like that of packardii, but is evenly rounded ; 

 the large chela is more tapered, the marginal notch is narrower ; 

 the groove on the outer surface runs farther back and there is no 

 distal constriction of the lower margin; the dactyl is relatively 

 smaller and shorter and articulates more obliquely. The smaller 

 chela also differs in form and armature of hairs. The second 

 legs are longer. The dactyls of third legs are different, etc. The 

 rostrum and antennal scales are similar in the two species. Taken 

 on the Challenger Bank, in 24 fathoms, on a nullipore bottom, by 

 the Field Natural History Museum party, in Oct., 1905 (No. 

 901). 



It is named in honor of the director of the party, the late Dr. 

 Tarlton H. Bean, the eminent ichthyologist. 



Alpheus formosus Gibbes or Crangon formosus. Striped Snapping 

 Shrimp. 



Alpheus formosus Gibbes, Proc. Amer. Asso. Adv. Sci., iii, p. 196 (32), 



1851. 

 Alpheus poeyi Guerin, in La Sagra's Hist. Cuba, second part, Zool., vol. 



vii, Crust., p. xix, vol. viii, pi. ii, fig. 10, ioa, 1857. 



