Explanation of the Plates. 



PL I. 



Streptoceplialtts dichotomus, Baird. 



Fig. 1. Adult ovigerous female, viewed from right side, and ex- 

 hibited in the normal attitude of the animal, the belly turned 

 upwards ; magnified 9 diameters. 



« 2. Adult male in the same attitude, viewed from left side; 

 same amplification. 



« 3. Same, frontal protuberance. 



« 4. Same, left antenna viewed from the outer face; magnified 

 13 diameters. 



« 5. Same, terminal part of right antenna, viewed from the inner 

 face; magnified 19 diameters. 



<t 6. Same, one of the digitiform appendages of the basal part 

 isolated. 



« 7. Leg of 1st pair, magnified 19 diameters. 



« 8. Leg of 6th pair; same amplification. 



« 8a. Part of terminal lobe of endopodite from same leg, more 

 highly magnified. 



« 9. Leg of last pair. 



« 10. Extremity of tail with the caudal rami, from a male spe- 

 cimen, dorsal view. 



PI. IL 



Leptestlieria nobilis, G. 0. Sårs. 



Fig. 1. Adult male specimen, viewed from left side ; magnified 9 dia- 

 meters, 



« 2. Same, dorsal view. 



« 3. Same, head with part of the cervical segment, seen from 

 left side (antennæ removed); magnified 19 diameters. 



« 4. Same, leg of 1st pair, viewed from the anterior face ; magni- 

 fied 26 diameters. 



