NO. 3538 DECAPOD CRUSTACEANS — CHACE 627 



Distribution: Mediterranean Sea; West Africa as far south as 

 northern Angola; Azores; St. Helena (new record). Commensal in 

 bivalve mollusks of the genus Pinna. 



Family Alpheidae 



Alpheus macrocheles (Hailstone) 



Figure 2 



Hippolyte macrocheles Hailstone, 1835, p. 395. 

 Alpheus macrocheles. — Holthuis, 1951, p. 69. 



Material: Off Rupert's Bay; buoy; 0-2 meters; Feb. 11, 1963; 1 

 ovigerous female. — James Bay; collected by skindiver; Aprd 1964; 

 1 ovigerous female. 



Measurements: Carapace lengths to base of rostrum, 5.1 and 7.2 

 mm. 



Remarks: The smaller specimen bears only two or three eggs, 

 suggesting that it is a very young adult. In the proportions of the 

 antennular peduncle and last three pereiopods and in the length of 

 the distal spine on the attenal scale, the larger specimen resembles 

 two much larger British specimens of A. macrocheles available for 

 comparison more closely than does the smaller one, but the detached 

 minor chela associated with the larger St. Helena specimen is much 

 slenderer and has a more pronounced dorsal notch than noted in the 

 British specimens. Comparison of this appendage with those of 

 typical specimens of A. macrocheles of similar size would be desirable. 



Distribution: The recorded range of A. macrocheles extends from 

 the south coast of England to the Cape Verde Islands and Guinea, 

 including the Mediterranean, usually in depths of from 20 to more 

 than 100 meters. The western Atlantic records of this species in 

 Rathbun (1901) and Schmitt (1935) are based on fragmentary speci- 

 mens and requu-e verification. 



Alpheus paragracilis Contiere 



Alpheus paragracilis Coutifere, 1897, p. 304; 1905, p. 883, pi. 76, figs. 22-22g. 

 Crangon paragracilis. — Banner, 1953, p. 96, fig. 33. 



Material: Off Rupert's Bay; buoy cable; 0-75 meters; Jan. 17, 

 1958; 2 females. — Same; Mar. 18, 1960; 1 female with two major 

 chelae. — Same; Apr. 5, 1962; 1 male. — James Bay; collected by skin- 

 diver; April 1964; 1 ovigerous female. 



Measurement: Carapace length of male to base of rostrum, 4.4 

 mm.; of females without eggs, 4.3-5.2 mm.; of ovigerous female, 

 5.9 mm. 



