132 Bulletin Vanderbilt Marine Museum, Vol. VI 



branch one and one-half times as long as the peduncle, quite thick 

 for the proximal three-fourths of the length, the distal fourth be- 

 ing thread-like; the longer branch is two and one-half times as 

 long as the shorter one and very fine. 



The antennae have the basal article strong, supporting a slen- 

 der stylet-like stylocerite that extends 45 per centum of the scapho- 

 cerite; the scaphocerite is as long, but nowhere so wide as the 

 cylindrical carpocerite with which it is subequal in length. The 

 scaphocerite is principally a strong stylus, with the outer lateral 

 margin concavely excavate ; the tip very acuminate, the outer side 

 of the scaphocerite is much thickened; the inner side is greatly 

 reduced, scarcely three-fifths as long as the outer portion, less 

 wide proximally than the outer thickened half, tapering distally, 

 sloping narrowly to the margin of the thickened outer half ; this 

 inner side is fringed along the distal half of the outer margin 

 with very long, web-like setae, projecting distally a little beyond 

 the apical spine; these web-like setae, unless most critically ex- 

 amined, give the illusion of being the oval inner half of the blade 

 usually present in Apheids, but which is conspicuously absent 

 in the present species. The flagellum is quite fine, slightly longer 

 than the entire body. 



The abdominal terga are moderately compressed, the lateral 

 margins not greatly produced, the twelve eggs being arranged in 

 series of three, one behind the other, between the pleopoda. The 

 telson is 1.2 times as long as the sixth abdominal segment, much 

 tapered, with truncate distal margin, the dorsal margin is armed 

 with two pairs of submedian, articulated spines and has a slight 

 median depression proximally; the distal margin is fringed with 

 long setae. The uropoda have each blade a third longer than the 



Text figure 10 — Alpheus braschi Boone, outer lateral view of 



great cheliped, X 8. 



