76 U.S. NATIONAL IMUSEUM BULLETIN 2 92 



capture indicate that the young hatch as a zoea (fig. 13). It seems 

 unhkely that such early stages could avoid being carried down to 

 the lower reaches of the streams inhabitated by Micratija, and many 

 of the larvae must be swept out to sea. 



Genus Potimirim 



11. Potimirim americana (Guerin-Meneville) 



Figure 19a 



Caridina americana Gu^rin-M^neville, 1855, pi. 2: figs. 13, 13a [type-locality: 



Cuba]. 

 Orlmannia americana. — Bouvier, 1904, p. 136; 1925, p. 282, figs. 655-659. 

 Potimirim americana. — Holthuis, 1954, p. 3 [by implication]. — Smalley, 1963, 



pp. 178-179, fig. 2. 



Diagnosis. — Orbital margin unarmed. Rostrum without dorsal 

 teeth, dorsal margin slightly convex in distal half, ventral margin 

 dentate but not finely serrate. Ventral margins of abdominal pleura 

 unarmed. Eyes not reduced. Basal segment of antennular peduncle 

 without dorsal spines proximal to series bordering distal margin. 

 Pereiopods without exopods. Fingers of chelae of first and second 

 pereiopods bearing terminal tufts of long hair. Carpus of second 

 pereiopod much longer than broad. Last three pereiopods without 

 prominent horny scales or tubercles. Merus of third pereiopod not 

 noticeably broader than that of fourth. Appendix mascuUna on 

 second pleopod of male roughly disc shaped, nearly three-fourths as 

 broad as long. A small species, maximum postorbital carapace length 

 about 5 mm. 



Habitat. — Freshwater streams. 



DiSTKiBUTioN. — Cuba, Jamaica, Trinidad. 



Remarks. — See "Remarks" under P. glabra (p. 79) regarding the 

 record of Caridina americana from Dominica in Pocock (1889). 



12. Potimirim glabra (Kingsley) 

 Figures 15, 196, c 



Atyoida glabra Kingsley, 1878b, p. 93 [type-locality: west coast of Republic of 



Nicaragua]. 

 1 Caridina americana? Pocock, 1889, p. 16. 



Potimirim glabra.— Holthuis, 1954, p. 3, fig. 1.— Smalley, 1963, pp. 177-182, fig. 1. 

 Potimirim brasiliana Villalobos, 1960, p. 275, pis. 1-5 [type-localtiy: Rfo Arir6, 



Angra dos Reia, Estado do Rio de Janeiro, Brazil]. 



Diagnosis. — Orbital margin unarmed. Rostrum without dorsal 

 teeth, dorsal margin convex distally, ventral margin obscurely dentate, 

 not finely serrate. Ventral margins of abdominal pleura unarmed. 

 Eyes not reduced. Basal segment of antennular peduncle without 

 dorsal spines proximal to series bordering distal margin. Pereiopods 



