COPBPODS OP THE WOODS HOLE REGION 611 



62. First 3 pairs of legs uniramose, fourth pair biramose, all 1-seg- 



mented; first antenna 9-segmented; caudal rami cylindrical, 



setose; gills of fishes 9 Eassettithia Wilson, 1922 



First 2 pairs of legs biramose, last 2 uniramose, all rami 2-seg- 



mented 63 



First and second legs not segmented alike, third and fourth 



pairs 1-segmented 64 



63. Carapace nearly as wide as long, with lateral and posterior 



lobes; genital segment with rounded lobes at posterior cor- 

 ners; gills of cephalopods cf Pennella Oken, 1816 (p. 489) 



Carapace without lobes, one-half longer than wide; genital 

 segment also without lobes at its posterior corners, longer 

 than wide; gills of fishes cf Lernaeocera Blainville, 1822 (p. 485) 



64. First, third, and fourth legs uniramose, second legs biramose, 



all rami 1-segmented; first antennae 3-segmented; caudal 

 rami lanceolate and setose; gills of fishes. 



cf ? Pseudocycnus Heller, 1865 (p. 474) 

 First endopods 1-segmented, exopods and both rami of second 

 legs 2-segmented, third and fourth legs uniramose, 1-seg- 

 mented; caudal rami laminate; gills of fishes. 



9 Pseudoclavella Bassett-Smith, 1898 



65. First 2 pairs of legs biramose, exopods 3-, endopods 2-seg- 



mented; third legs uniramose, 2-segmented; fourth and fifth 



legs lacking; in surface tow 9 Eurynotopsyllus T. Scott, 1901 



First 2 pairs of legs biramose, third pair uniramose, all rami 

 2-segmented; fourth and fifth legs lacking; genital segment 

 and abdomen fused; fins of fishes, cf Sarcotretes Jungersen, 1911 (p. 484) 



First 2 pairs of legs biramose, third, fourth, and fifth pairs 



uniramose, replaced by setae or lacking 66 



First legs only biramose, second and third uniramose, fourth 



and fifth lacking ^_ 67 



66. Rami of first 2 pairs of legs 2-segmented; third and fourth pairs 



replaced by setae or lacking; second antenna with a stout 



terminal claw; gills of fishes c?" 9 Hatschekia Foche, 1902 (p. 476) 



Rami of first 2 pairs of legs 1-segmented; third pair uniramose, 

 lamellar, fourth pair lacking; second antenna with a terminal 

 chela; gills of fishes cf 9 Dichelesthium Hermann, 1804 (p. 478) 



67. Rami of first legs 2-segmented, of second and third legs 1-seg- 



mented; first antenna 4-segmented; second antenna 3-seg- 

 mented, tipped with plumose setae; on sipunculids. 



9 Ventriculina Bassett-Smith, 1903 

 Rami of first legs 1-segmented, of second and third legs also 

 1-segmented; first antenna 6-segmented; second antenna 

 2-segmented, with apical claw; gills of fishes. 



9 Cybicola Bassett-Smith, 1898 



68. Trunk straight; legs close together near head; ovisacs filiform, 



eggs uniseriate; abdomen with featherUke processes; flesh 



of mammals and fishes 9 Pennella Oken, 1816 (p. 489) 



Trunk straight; legs widely separated on head, neck, and 



trunk; egg cases sacklike, eggs multiseriate 69 



Trunk straight; first 2 pairs of legs close to head, the others 



at short intervals; ovisacs filiform, eggs uniseriate 73 



Trunk with sigmoid curve; legs close together near head; ovisacs 



filiform, convolute, or coiled in tight spirals 78 



