PSEUDOCYCLOPS COPEPODS—-BOWMAN AND GONZALEZ 49 
seta arising from bulge at base; 2—3 rows of surface spinules present, 
each row with 1—4 spinules. 
Mate: Length 0.37-0.43 mm. Habitus as in female. Prosome 
3-3.5 times as long as urosome. Rostrum not articulated at base. 
Posterior margins of urosome segments 1-4 serrate; serrations of 
segment 4 much coarser than others. Caudal setae as in female. 
Right antenna 1 with 14 segments; anterior margin of antepenultimate 
segment produced distally into acute triangular process. Leg 5 with 
basic plan the same as that of P. cokeri. Exopod of right leg with 
heavier outer distal spine; longer inner spine less curved distally. 
Endopod a rounded lobe about twice as long as wide. Left basipod 
without surface spinules. Outer distal seta on left exopod segment 1 
linear, without flange, slightly broadened at apex; membranous lobes 
of segment 2 narrower than in P. cokert. Left endopod bearing 5 
jointed setae on distal margin. Seta adjacent to endopod rounded 
at apex. 
Cotor: We did not distinguish P. paulus from P. cokeri when we 
we studied live material. Preserved specimens are colorless, and if 
living specimens have any pigment the species probably would have 
been detected during the examination of freshly collected material. 
Typrs: Holotype, female, USNM 104389; allotype, male, USNM 
104390; and 42 paratypes (37 females, 5 males) from Thalassia meadow, 
Canal de Magtieyes, La Parguera, Puerto Rico, collected Feb. 23, 1959. 
The specific name paulus (Latin “paulus,”’ meaning little) refers to 
the minute size of this species. It is one of the smallest species of 
Calanoida yet discovered; only Pseudocyclopia minor T. Scott (1892) 
with a length of 0.43 mm. and Paracalanus crasstrostris Dahl, the 
male of which is reported to measure 0.34 mm. (Gurney, 1927), 
rival it in smallness. 
P. paulus is very similar to P. wmbricatus Giesbrecht (1893), known 
from the Gulf of Naples and the Suez Canal. P. wmbricatus is larger 
(0.60-0.65 mm.); the forehead is less convex; the rostrum is relatively 
shorter and straighter; the endopod of female leg 5 is 2-segmented, 
without surface spinules; and the left endopod of the male leg 5 has 4 
rather than 5 setae. 
Pseudocyclops rostratus, new species 
Figures 6-8, 9g 
Frmaue: Length, excluding caudal setae, 0.72-0.76 mm. Prosome, 
viewed dorsally, slightly more than twice as long as wide. Head fused 
with first pedigerous segment except in ventrolateral region, where 
weak partial suture is present. Rostrum huge, curving slightly 
