COPEPODS OF THE WOODS HOLE REGION 597 



123. Exopod of first leg 1- or 2-segmented, endopod 2- or 3-seg- 



mented; exopods of second, third, and fourth legs 4-seg- 



mented, endopods 2- or 3-segmented; gills of fishes. 



d^ 9 Bomolochus (part) Nordmann, 1832 (p. 381) 

 Exopods of first 3 pairs of legs 2-segmented, endopods 1- 



segmented; fourth and fifth legs lacking; first antenna 6- 



segmented; second antenna 4-segmented; on annelids. 



9 Pherma Wilson, 1923 

 Rami of first and second legs aUke, of third and fourth legs 



different 124 



Rami all varying, some of them usually lacking 130 



124. Rami of first and second legs 1-segmented 125 



Rami of first and second legs 2- or 3-segmented 128 



Exopods of first and second legs 3-segmented, endopods 2- 



segmented 129 



125. Exopod of third legs 1-segmented, endopod and fourth legs 



lacking 126 



Both rami of third and fourth legs lacking 127 



126. Fifth leg 1-segmented, with 2 setae in female, 5 in male; second 



antenna with a stout apical claw; first antenna 6-segmented 



and sparsely setose; on brittle stars cf 9 Cancerilla Dalyell, 1851 



Fifth and genital segments fused; fifth leg a stout spine; 

 sec.ond antenna with 2 apical setae; first antenna 4-seg- 

 mented, densely setose (Antarctic Ocean). 9 Selenodiscus Brady, 1910 



127. First and second exopods each with 4 spines serrate on both 



margins, endopods with 3 such spines; second segment with 



pointed corners; pelagic, 260 fathoms 9 Saphirella T. Scott, 1894 



First and second exopods each with 5 spines serrate on one 

 margin, endopods with setae only; second segment with 

 rounded corners; surface (New Zealand) 9 Paurocope Brady, 1899 



128. Rami of first and second legs 3-segmented; third, fourth, and 



fifth legs lacking; first antenna 10-segmented; second an- 

 tenna 3-segmented, with a 1-segmented exopod; mud, 5 



fathoms cf Entomolepis Brady, 1899 



Rami of first and second legs 2-segmented; exopods of third 

 and fourth legs 2-segmented, endopods 1-segmented; second 

 antenna 4-segmented, without an exopod; fins of fishes. 



cf 9 Tucca Kr0yer, 1837 (p. 379) 



129. Exopod of third leg 2-segmented, endopod, both rami of 



fourth leg, and fifth leg lacking; a sucking disk in front of 



mouth of female; on annelids cf 9 Eunicicola Kurz, 1877 



Both rami of third leg and exopod of fourth leg 1-segmented; 

 endopod of fourth leg and fifth leg lacking; no sucking disk 

 in female; on annelids 9 Clausia Clapar^de, 1863 



130. One or both rami present in each of first 4 pairs of legs 131 



Both rami lacking in one or more of first 4 pairs of legs 132 



131. Rami of first legs 1-segmented, of second and third legs 



2-segmented; exopod of fourth leg 2-segmented, endopod 

 lacking; fifth leg lamellar and unarmed; invertebrate 



washings cf 9 Stephopontius Thompson and Scott, 1903 



Rami of first leg and endopod of third leg 2-segmented; rami 

 of second leg and exopod of third leg 3-segmented; fourth 

 exopod 1-segmented, endopod lacking; dredged, 40 fathoms. 



cf 9 Parartotrogus T. and A. Scott, 1893 



