1923] Rathbun, Brachyuran Crabs of West Coast of Mexico 621 



Callinectes arcuatus Ordway 

 1863, Boston Journ. Nat. Hist., VII, p. 578. 



San Jose del Cabo; March 26; 2 cf 2 9 (1 immature, 1 soft-shell). 



Callinectes bellicosus (Stimpson) 

 Lupa bellicosa Stimpson, 1859, Ann. Lye. Nat. Hist. N. Y., VII, p. 57 [11]. 



Point San Bartholome: With boat dredge; March 13; 3 cf 2 9 . 

 March 14; 1 cf . In seine; 4 juv. 



Abreojos Point; March 16; 2 9. 



BallenasBay; March 16; 2 cf juv., 1 9 juv. 



S. end of Magdalena Bay; March 20; 10 cf 2 9 . 



Pichilinque Bay: By electric light; March 27; 6 juv. March 29; 

 1 cf juv. 



Agua Verde Bay; April 2; 2 immature 9. 



Mulege, at mouth of river; in 100-foot seine; April 4; 1 cf . 



Ricason Island, Concepcion Bay; April 7; 8 cf 2 9 . 



Cronius ruber (Lamarck) 



Portunus ruber Lamarck, 1818, 'Hist. Nat. Anim. sans Vert.,' V, p. 260. 

 Amphitrite edwardsii Lockington, 1877, Proc. Calif. Acad. Sci., VII, 1876, p. 43 [3]* 



Point San Bartholome; in seine; March 14; 2 cf 2 9. 



ATELECYCLIDjE 



Pliosoma parvifrons Stimpson 

 Plate XXVI 

 1860, Ann. Lye. Nat. Hist. N. Y., VII, p. 228 [100], PL in, fig. 6. 



Cape San Lucas; March 23; 1 cf . Carapace 20 mm. long, 18.8 

 mm. wide. 



The specimen is larger than those collected by Xantus and is better 

 developed. The spines are reduced in size, the gastric, hepatic and two 

 inner branchial prominences being scarcely more than tubercles. The 

 first ambulatory leg is nearly twice as long as the carapace ; the cheliped 

 is stronger than the legs and one and two-thirds times as long as the 

 carapace; surface finely granulate except on distal half of fingers; merus 

 subcylindrical, carpus subspherical; propodus a little compressed, in- 

 creasing in width gradually and regularly almost to the fingers where the 

 lower margin bows outward, giving the fixed finger a sinuous edge and 

 making a considerable gape between the proximal halves of the fingers, 

 into which a very low, broad tooth projects from the dactylus; meeting 

 edges crenulate. 



