PLATE I. 



Figs. 1-7. Lophogaster typictis, M. Sars. 



Fig. 1. Adult male, from left side ; magnified about five times. 



Fig. 2. Female, from above. 



Fig. 3. Anterior part of carapace of male, along with eyes, antennulse and antennae, 

 viewed from above. 



Fig. 4. Basal part of a female antenna, with antenna! scale and proximal section of 

 flagellum, from below. 



Fig. 5. Leg of last pair. 



Fig. 6. Posterior extremity of tail, with caudal fan, from above. 



Fig. 7. Extremity of telsou ; more highly magnified. 



Figs. 8-17. Ceratolepis hamata, G. 0. Sars. 



Fig. 8. Female, from left side ; magnified about ten times. 



Fig. 9. Same, from aliove. 



Fig. 10. Anterior part of carapace, with eyes, from above ; somewhat more magnified. 



Fig. 11. Anterior part of body, viewed from the ventral face, showing antennulse («'), 

 antennae («-), antennal scale (sq), anterior lip (i), mandibles (if), mandibular 

 palps (p), second pair of maxillae {ni'), maxillipeds {mp'), with their rudi- 

 mentary exopodite {x). 



Fig. ] 2. Base of an antenna, with antennal scale. 



Fig. 13. One of the gnathopods. 



Fig. 14. One of the legs. 



Fig. 15. Posterior pair of legs, with the corresponding pair of incubatory lamellae and 

 the rudimentary exopods. 



Fig. 16. A caudal epimeron, lateral aspect. 



Fig. 1 7. Extremity of tail, with caudal fan, from above. 



Note. — The figures on all the plates have been drawn by the author with the aid of the camera lucida. 



