EXPLANATION OF THE PLATES. 



Plate 1. 



Fig. 1, dorsal view of tlie male of Anthosoma crassum; fig. 2, dorsal view of 

 the female, after T. and A. Scott, showing how the entire body is concealed by 

 the dorsal plates of the head and thorax ; fig. 3, first antenna of male ; fig. 4, 

 second antenna of male, side view ; fig. 5, first maxilla, with palp ; fig. 6, second 

 maxilla ; fig. 7, first swimming leg ; fig. 8, second swimming leg ; fig. 9, dorsal 

 view of the female of LernmUhropus caudatus; fig. 10, first swimming leg of 

 same; fig. 11, second swimming leg. 



Plate 2. 



Fig. 12. side vievv' of the female of Let'nantJiropus caudatus; fig. 13, ventral 

 view of same ; fig. 14, second maxilla ; fig. 15. maxilliped ; fig. 16, ventral view 

 of female of Lcrnanthropus rathhuni, showing rudiments of fifth legs on the 

 sides of the fifth segment ; fig. 17, maxilliped of same ; fig. 18, first swimming leg 

 endopod on the left ; fig. 19, secon<l swimming leg, eiulopod on tiie right. 



Plate 3. 



Fig. 20, dorsal view of the female of Lernanthropus rathhuni; fig. 21, side 

 view of same ; fig. 22, second maxilla ; fig. 23, first antenna of Lernanthropun 

 leidyi; fig. 24, second antenna of same; fig. 25, second maxilla; fig. 26, maxil- 

 liped ; fig. 27, first swimming leg. 



Plate 4. 



Fig. 28, dorsal view of the female of Lernanthropus leidyi; fig. 29, side view 

 of same ; fig. 30, dorsal view of male of same ; fig. 31, first antenna of female of 

 Lernanthropus chlamydotxis ; fig. 32, second antenna of same; fig. 33, mouth tube 

 and first maxillae ; fig. 34, .second maxilla ; fig. 35, maxilliped. 



Plate 5. 



Fig. 36, dorsal view of female of Lernmithropus chlamydotus ; fig. 37, dorsal 

 view of male of same, cleared in oil of wlntergreen, showing the repi'oductive 

 system ; sp, sperm ducts ; sr, spermatophore receptacle ; t, testes ; fig. 38, first 

 swimming leg of male, endopod on the left ; fig. 39, second leg, endopod also on 

 the left. 



Plate 6. 



Fig. 40, side view of female Lernanthropus chlamydotus, showing position of 

 oviducts; fig. 41, dorsal view of female of Lernanthropus paenulatus; fig. 42, 

 side view of same: fig. 43, dorsal view of male of same; fig. 44, first antenna of 

 female; fig. 45, mandible of male; fig. 46, first maxilla of female; fig. 47, 

 maxilliped of female ; fig. 48, first legs of male. 



Plate 7. 



Fig. 49, first legs of female of Lernanthropus paenulatus ; fig. 50, second leg 

 of same; fig. 51, dorsal view of male of Lcrnanthropus hreroortiae ; fig. 52 second 



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