54 U.S. NATIONAL MUSEUM BULLETIN 29 2 



paired hoodlike distomedian projections; stiff marginal strip armed 

 with spinules on distal curve, distomedian tip not projecting from sur- 

 rounding tissue. Thelycum covered by paired membranes meeting in 

 midline but gaping anteriorly; short, longitudinal carina protruding 

 from gape not bifurcate anteriorly. A large species when adult, maxi- 

 mum postorbital carapace length about 55 mm, estuarine specimens 

 considerably smaller. 



Habitat. — Adults marine; juvenile and immature specimens in 

 brackish, exceptionally in fresh water. 



Distribution. — Cuba and British Honduras to Estado do Rio de 

 Janeiro, Brazil (Cuba, Jamaica, Hispaniola, Puerto Rico, Saint 

 Thomas, Saint John, Trinidad). The typical subspecies, P. d. duorarum, 

 occurs in the Bermudas. 



Figure S. — Penaeus duorarum notialis, male (carapace length 22.8 mm) from south of Ja 

 maica {Oregon station 5396). 



4. Penaeus schmitti Burkenroad 



Figure 7d 



Penaeus setiferus. — Some authors prior to 1936 [part]. 



Penaeus schmitti Burkenroad, 1936, p. 315, figs, la, 2, 3 [type-locality: Kingston 

 Harbour, Jamaica]. — Holthuis, 1959, p. 61, fig. 6a. — Boschi, 1963, p. 17, fig. 5. 



Diagnosis. — Lateral rostral grooves not reaching nearly to pos- 

 terior margin of carapace, ending near posterior dorsal tooth. Rostrum 

 shorter than antennal scales, usually with ventral teeth. Antennular 

 flagella shorter than peduncle. Basis of both first and second pereiopods 

 armed with sharp spine. Fourth and fifth pereiopods shorter than third. 

 Petasma open, without hoodlike distomedian projections. Thelycum 

 open, not covered by paired membranes meeting in midline. A large 

 species when adult, maximum postorbital carapace length about 50 

 mm, estuarine specimens considerably smaller. 



Habitat. — Adults marine; juvenile and immature specimens in 

 brackish, exceptionally in fresh water. 



