Decapod Crustacea of Bermuda, Part II. 85 



Alphcus formosus Rathbun, M. J., Proc. Wash. Acad. Science, vol. ii, 

 p. 152, 1900; Brachyura and Macrura of Porto Rico, p. 106, 1901. 



Alfihcus websteri Kingsley, op. cit., 1879, p. 416; Carcin. Notes, No. v, 

 op. cit., p. in (7), pi. ii, fig. 5, 1883. Rankin, op. cit, vol. xi, p. 249, 

 vol. xii, p. 543, 1900 (Bermuda). 



Crangon formosus Hay and Shore, op. cit., p. 384, pi. 26, fig. 5, 1918. 



TEXT FIGURES sd, 6a. PLATE XIX, FIGURES i, 2. PLATE XX, FIGURE 3. 

 PLATE XXIII, FIGURES 5, a, b. PLATE XXIX, FIGURES 4, a-u. PLATE 

 XXV, FIGURES 6-6a (type of A. poeyi). 



In life the color is conspicuous and characteristic. The body 

 llowish or greenish brown, with a conspicuous dorsal stripe 

 of pale yellowish or white, extending to the telson, and a more or 

 less interrupted stripe of the same color on each side ; margins of 

 abdomen bright blue. The ground-color, between the stripes, is 

 finely speckled with orange. Uropods white at base, tipped with 

 orange or yellow. Large chela, on the inner side, yellowish brown, 

 or nearly like the carapace ; tip and dactyl bright orange, with a 

 whitish spot at the base of the thumb. Ambulatory legs and 

 flagella of the antennules and antennae, bright blue. 



The large chela (pi. 19, fig. 2 ; pi. 23, fig. 5a) is notable for the 

 absence of notches and longitudinal grooves, present in all other 

 Bermuda species of true Alpheus (or Crangon}, being in this 

 respect like the chela in Synalpheus. It is long-ovate, swollen 

 proximally, fixed finger is short, acute, incurved at the tip, shorter 

 than the dactylus, which is stout, arched gradually, blunt at end. 

 The smaller chela (pi. 23, fig. 5b) is long and slender, smooth, 

 simple. The merus is triquetral, with an acute tooth on the distal 

 superior and outer angles; carpus short, convex above, with a 

 distal tooth; palm of chela about equal in length to the dactyl; 

 its distal articular margin lias a spiniform tooth at each angle, 

 the outer one longer and sharper; the superior proximal area is 

 bounded by an impressed faint line, extending back on the dorsal 

 and inner surfaces, and enclosing an ovate area. Fixed finger 

 nearly straight, slender, a little turned up close to the tip; dactyl 

 nearly straight to about the middle, then gently arched to the tip. 



Fingers are nearly equal in size; shutting closely, compressed 

 laterally, both hooked at the acute tips, which overlap when closed ; 

 both sides slightly hairy; the hairs of the dactyl arise from a 

 nearly straight groove below a sharp ridge on both sides. The 



