ON THE BRITISH EDRIOPHTHALMA. 



61 



fig. 1- 



Fig. 2. 

 Fig. 3. 

 Fig. 4. 



Fig. 5. 



Fig. 6. 

 Fig. 7. 



Fig. 8, 



PL.^TE XV. 



Anterior labium of Gammarus 

 locusfa. 



Posterior labium of ditto. 



First maxilla of ditto. 



First maxilla of Sulcator are- 

 narius. 



Second maxilla of Gammarus lo- 

 cusfa, 



Maxilliped of ditto. 



Two segments from IscBa Mon- 

 tayui, showing their mode of 

 attachment. 



Inside of the coxae from Gam- 

 marus^ showing the manner of 

 their connexion with the legs 

 and to the segments of the body. 



PLATE XVI. 



Diagrams showing the homologies of 

 separate parts. 



Fig, 1. Imaginary AnipMpoda. 



A. Cephalic ring or region. 



a. Anterior portion, or infra 

 antennal segment. 



h. Posterior portion, or man- 

 dibular segment. 



B. Pereion, or portion carrying the 



pereipoda or perambulatory 



legs. Thorax of authors. 

 Bl. Anterior portion, bearing the 



two gnathopoda. 

 B2. Posterior portion, bearing the 



five pereipoda. 



C. Pleon, or portion carrying the 



swimming feet (abdomen of 



authors) . 

 CI. Anterior portion. 

 E2. Posterior portion. 



1. Superior antenna. 



c. Auditory cilia. 



2. Inferior antenna, 



a. Olfactory denticle. 



3. Mandible. 



h. Mandibular filament. 



4. First maxilla. 



5. Second maxilla. 



6. Maxilliped. 



7. 8. Two gnathopoda. 



9, 10. Anterior pereipoda. 

 1 1,12, IS.Posteriorpereipoda. 

 14, 15, 16. Anterior pleopoda. 

 17,18,19. Posterior pleopoda. 

 20. Telson (extremity). 

 Pig. 2. Leg of Macroura, after Edwards. 

 Figs, 3, 4, 5. Legs of Amphipoda. The 

 lines drawn through each joint 

 demonstrate the homologies. 



PLATE XVII. 



Microscopic Sections of the Skin and 

 Hairs. 

 Skin of 



1. Talitrus locusta. 



2. Dexamine bispinosa. 



3. Calliojie Leachii. 



4. Gammarus gracilis. 



5. Gammarus locusta. 



6. Gammarus Othonisl 



7. Galanthis Lubhochiana (leg). 



8. Tetromatus typictts. 



9. Lembos Damnoniensis, 



10. Chelura terebrans. 



11. Amphitoe lillorina. 



12. From thorax of 7, 



Hairs of 



A. Sulcator arenarius. 



1. On legs, &c. 



2. On maxilliped (3rd joint). 



3. On maxilliped (5th joint). 



4. 5. On carpus of gnathopoda. 



6. On propodos of gnathopoda. 



8. On propodos of gnathopoda. 



7. On mandible. 



9. On propodos, 1st gnathopoda. 



10. On antennae, &c. 



11. On superior antenna. 



12. On inferior antenna. 



B. Hair from Talitrus. 



C. Hairs from Tetromatus. 



D. Teeth from maxilliped of species. 



1. Talitrus locusta. 



2. Anonyx denticulatus. 



3. Anonyx HolboUi. 



4. Tetromatus typicus. 



5. Tetromatus Bellianus. 



PLATE XVIII. 

 Organs of Respiration. 



1 . Sulcator arenarius. 



2. Gammarus locusta. 



3. Talitrus locusta. 



4. Neck of 2, showing a tendency 

 to a more leaf-like structure. 

 Caprella. 



a. Anterior. 



b. Posterior. 

 jEgi7ia longispinosa. 

 Internal structure of branchial 

 sac, side near the middle. 

 Ditto, from bottom of sac. 



_. Blood-corpuscles. 



10. Leg and branchia of young De- 

 capod. 



Fig. 11. Diagram showing the arrange- 

 ment of the plates -which form 

 the incubatoi-y pouch and the 

 position of the branchial sacs. 



Fig. 

 Fig. 

 Fig. 

 Fig. 



Fig. 5 



Fig. 

 Fig. 



Fig. 



Fig- 

 Fig. 



9. 



