PLATE I. 



Figs. 1, 2. Lepas anatifera, Linn. 



Fig. 1. Body, with the left baud scutum and tergum taken away; natural .size-. 



ec, right hand scutum ; t., right hand tergum ; ca., carina ; x., membrane ; 



ma., part of the membrane which has been attached to left hand scutum; m., 



parts of the mouth ; c 1 , first cirrus. 

 Fig. 2. Mouth and first cirrus of the left side; magnified 5 diameters, ma., m., c l as 



in fig. 1; /i and f'\ filamentary appendages; p., penia; ovd., oviduct; ga., 



female genital aperture. 



Fig. 3. Lepas hillii, Leach, sp. 



Fig. 3. Mouth and basal articulations of the first three cirri; magnified 6 diameters. 

 m., mouth; /', / 2 , and/3, filamentary appendages; c 1 , &, and &, first, second, 

 and third cirrus. 



Fig. 4. Lejxts anserifera, Linn. 



Fig. 4. Basal articulation of the first cirrus; magnified 6 diameters. /', / 2 ,/ 3 , and /', 

 filamentary appendages. 



Figs. 5-7. Lepas fascicularis, Ellis and Sol. 



Fig. 5. Mandible; magnified 41 diameters. 

 Fig. 6. Maxilla; magnified 41 diameters. 



Fig. 7. Basal articulation of the first cirrus; magnified 6 diameters, f 1 ,/ 2 ,/ 3 ,/*, and 

 /•'', filamentary appendages. 



Figs. 8-10. Pcecilasma carinatum, n. sp. 



Fig. 8. Animal, lateral view; magnified 2 diameters. 



Fig. 9. Mandible; magnified 41 diameters. 



Fig. 9*. Inferior angle of the mandible; magnified 270 diameters. 



Fig. 10. Maxilla; magnified 41 diameters. 



