242 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



part of the shelf. Offshore species that occasionally are carried into 

 the inner shelf and bays are not included. 



In the descriptions that follow we use the terms employed by 

 Gooding (1957) for regions of the copepod body and the following 

 abbreviations : 



PedSeg 1-PedSeg 5 pedigerous segments 1-5 



For most species the synonomies given are limited to those record- 

 ing occurrences along the Atlantic coasts of North and South America. 

 For a few species we have thought it useful to give full synonomies 

 and more complete descriptions. Only western Atlantic distribution 

 records are given in detail for widely distributed species. 



This study was initiated by Dr. Robert E. Coker, and his advice 

 and encouragement have been most helpful. Dr. Friedrick Kiefer 

 kindly examined specimens of Oithona hehes for us and compared 

 them with Brazilian specimens that he had earlier described, and Dr. 

 Harry Yeatman read the section on Longipedia helgolandica and has 

 permitted us to cite his records for this species. 



Order Calanoida 

 Family Paracalanidae 



Head and PedSeg 1, PedSegs 4 and 5 fused. Male head with small 

 middorsal protuberance. Rostrum with 2 usually filiform appendages. 

 Anal segment long. Al 23-25-segmented in female, with fewer seg- 

 ments in male. Ri of A2 longer than Re. Mouthparts reduced in 

 male. Re of P1-P4 3-segmented, Ri of Pi 2-segmented, Ri of P2-P4 

 3-segmented. Ri of P1-P4 often with spinules on posterior surfaces. 

 Re3 of P1-P4 with 2 outer spines and 5 inner setae; terminal spine not 

 serrate. Female P5 very small, sometimes absent, uniramose, com- 

 posed of 2 short segments; left P5 of male 5-segmented, much longer 

 than right. 



Bernard (1958) removed Calocalanus from the Paracalanidae to 



