250 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



1932b, pp. 106-107, fig. 71.— Sutcliffe, 1948, p. 235.— Davis, 1950, p. 94 

 (table).— King, 1950, p. 128 (table).— Deevey, 1952a, p. 90; 1952b, p. 131 

 (table); 1960, p. 16 (table).— Grice, 1956, pp. 66-67; 1960a, p. 223.— Grice 

 and Hart, 1962b.— L6gar6, 1961, table 5.— Zoppi, 1961, table 4.— Breuer, 

 1962, p. 167.— Cervig6n, 1962, p. 184.— Reeve, 1964, passim. 



Female. — Length 1.1-1.3 mm. Posterior corners of PedSeg 5 

 rounded. Anal segment shorter than precedmg segment, slightly 

 asymmetrical. Right caudal ramus slightly longer than left, next-to- 

 innermost caudal setae swollen at base, especially the right seta. 

 P5 as in figure 5d. 



Male. — Length 1.0-1.2 mm. Anal segment asymmetrical, longer 

 on left side. P5 as in figure 5e. 



Distribution. — On the east coast of the United States north of 

 Cape Hatteras it is uncommon and is listed usually as a stray from 

 the south. The most northern record appears to be that of Bigelow 

 (1926, p. 293) from the Gulf of Maine. It is common in coastal 

 waters south of Cape Hatteras (unpublished observations) and in the 

 Gulf of Mexico. 



On Smithsonian-Bredin Expeditions it was collected at Castries 

 Harbor, Saint Lucia, and at Mujeres Harbor, Quintana Roo, Yucatan, 

 Mexico. In the|Puerto Rico collections, T. turbinata was found only 

 rarely in the bays but was fairly common in the shelf area, where 

 it was taken much more frequently than T. stylifera. 



Remarks. — T. longicornis , which replaces T. turbinata north of 

 Cape Hatteras, is similar but can be distinguished easily by the 

 long anal segment and symmetrical caudal rami. 



Family Pseudodiaptomidae 



Head and PedSeg 1 fused or separate. Urosome of 3-4 segments 

 in female, 5 segments in male; female caudal ramus at least 2.5 

 times as long as broad. Female Al 20-22-segmented; right male Al 

 prehensible, with reduced number of segments. Re and Ri of P1-P4 

 3-segmented. Female P5 non-natatory, without Ri, Re 2-segmented. 

 Right male P5 without Ri, Re 2-3-segmented with terminal hook; 

 Ri of left P5 present or absent. Re 2-3-segmented. 



Genus Pseudodiaptomus Herrick 



Female P5 without spines or processes on inner margin of Rel. 

 B2 of left male P5 without long curved process on inner margin. 



Pseudodiaptomus cokeri, new species 



Figures 6-9 



Female. — Length 1.35-1.50 mm. In dorsal view prosome (0.97- 

 1.02) 1.7-1.9 times as long as urosome (0.52-0.59). Head fused with 



