Boone, Crustacea, Cruises of ''Eagle" and ''Ara," 1921-28 175 



Material examined: Young, ovigerous female specimen found in 

 loggerhead sponge, Knight's Key, Fla., in 2 fms., March 6, 1925, by 

 the "Ara." 



Technical description: This species is very closely related to 8. 

 hrevicarpus, from which it may be distinguished by the following 

 differences : 



The three frontal teeth are equilateral triangles separated by a shal- 

 low U-shaped sinus; the median tooth is a trifle slenderer than the 

 lateral. The abdomen is stout; the epimera broadly rounded. The 

 eyes are covered, situated behind but near the frontal margin and not 

 raised in convexities, beyond the surface of the lateral tooth. The 

 antennulae have the first peduncular article twice as long as the sec- 

 ond, which in turn is one and one-half times as long as the third 

 article ; the flagellum is two-branched, the external branch bifurcating 

 at the external tenth article. The stylocerite is very acuminate, distally 

 reaching to about midway the second peduncular article of the anten- 

 nulae. The basicerite is very acuminate, the lateral spine constantly 

 longer than its proximal width; the spine extends as far forward as 

 the basal antennular article. The scaphocerite is narrow, the thickened 

 outer lateral spine acuminate, reaching as far forward as the distal 

 margin of the peduncle of the antennulae ; the scale is narrow, with the 

 inner lateral margin tapering distally ; the terminal margin obliquely 

 convex and heavily ciliated. The carpocerite is a little longer than 

 the scaphocerite and extends beyond the antennular peduncle by a 

 distance equal to about three-fifths of the last peduncular article. 



The great cheliped is stout, regularly ovoid, armed with a small, 

 sharp spine on the inner distal upper margin at the base of the hinged 

 finger. The dactyl is broad, the upper margin curved, the tip obtuse, 

 the cutting edge sinuous. The propodal finger is smaller. The smaller 

 chelae is not quite one-third the size of the larger, the palm narrowly 

 elliptical with slender, acute, down-curved fingers, set with several 

 small tufts of setae. 



The third, fourth and fifth legs are slender, the ratios as figured. 

 Synonymy. — Alpheus minus Say, Journ. Acad. Nat. Sci. Phila., vol. 1, 



p. 245, 1818. 

 Synalpheus minus Coutiere, Proc, U. S. Nat. Mus., vol. 36, p. 43, text 

 fig. 23, 1909. — Verrill, Trans. Conn. Acad. Arts and Sci., vol. 26, 

 p. 102, pi. 21, fig. 1, pi. 23, figs. 4, 4a, 5, 5a, pi. 24, figs. 2-2n, pi. 

 26, figs. 1, Id, 2 (variety) ; pi. 31, fig. 4, and pi. 25, fig. 3, pi. 47, 

 figs. 1-lc, fig. 2, pi. 48, figs. 3-3c (with full synonymy). 



