272 Bulletin Vanderbilt Marine Museum, Vol. VII 



inner lateral and distal margins of the merus and carpus spi- 

 nose; the propodi, which are about twice the length of the re- 

 lated carpal joints, are spinose along the upper lateral margin 

 with the entire surfaces paved with these sharp squamae as are 

 also the surfaces of the merus and carpus which are more thickly- 

 pilose than are the propodi. The dactyli are one-half as long as 

 the related propodi, curved, laterally compressed, acuminate, 

 with a dual series of long, brown setae along the upper margin. 



The antennal flagella are about as long as the propodi. 



The large eyes are reniform, set on short stalks and protected 

 beneath by the several strong spines arising from the bases of 

 both the antennae and antennulae. 



The external maxillipeds have the second or subdistal article 

 of the palp produced on the outer lateral margin into a moder- 

 ately convex process which bears distally a long tuft of setae. 



Sixty-three specimens which form an excellent series of 

 growth stages of the species, from post-larval forms to very large 

 old adults, were examined. 



Forty-five of these, of various ages, are typical in the number 

 and arrangement of spines on the first three abdominal somites. 

 On the remainder the variation existent in the number of spines 

 occurring on the first, second and third abdominal somites is as 

 follows : the Roman numerals represent the somites I, II and III, 

 the Arabic numerals the number of spines present, the sequence 

 of these numerals represents the somite on which they occur. 

 Large specimens : I, 12 ; II, 4 ; III, 4 ; I, 6 ; II, 6, III, 6 ; I, 4 ; II, 6 ; 

 III, 6; I, 8; II, 8; III, 6; I, 4; II, 6; III, 4; I, 4; II, 4; III, 4. 



Medium size specimens : I, 3 ; II, 5 ; III, 5 ; I, 2 ; II, 5 ; III, 4 ; 

 I, 2; II, 4; III, 3; I, 2; II, 4; III, 5; I, 2; II, 5; III, 4. 



Quite small specimens, with carapace 20 millimeters long; 



I, 2; II, 2; III, 2; I, 0; II, 2; III, 4; yet smaller specimens, with 

 transverse carinae less impressed and nearly devoid of spines 

 everywhere : specimen with carapace 16.5 millimeters long, I, 



II, 0; III, 0; specimens with carapace 14 millimeters long: I, 

 II, 0; III, 0; specimen with carapace 12 millimeters long: I, 

 II, 0; III, 0; specimen with carapace 10 millimeters long: I, 

 II, 0; III, 0. 



References : Munida gregaria, Boone, L., Bull. Vanderbilt Ma- 

 rine Mus., Vol. Ill, 1930, p. 53, pi. with synonymy) . 



