E.rplanation of the Plates^ 



PLATE I. 



ARTEMIS SALINUS.— Fip. 1. Of the natural size. 

 Fig. 2. Male, magnified, from beneath. 



3. Do. fore parts, from above. 



4. Do. Head with the Horn-like appendages forced forwards, out of 



their natural position. 



5. The labrum, more magnified. 6. The left Maxilla. 



7. One of the Mandibles, still more amplified. 



8. The second pair of Maxilla. 



9. One of the limbs ; a, basil joint ; b, cili.ited paddle ; c, pectinated 



scale ; d, digitated lobuli ; e, branchial sac ; /, ciliated scale. 

 10. Do. in a different position : the same letters mark the correspond- 

 ing parts. In this \-ie\v the branchial sac is better seen. 

 ARTEMIS GUILDINGI.— Fig. 11. Female magnified. 



Fig. 12. Under side of the abdominal portion, showing the biarticulate o\i- 

 ferous sac. 



PLATE II. 



ARTEMIS SALINUS.— Fig. l. Head of the female, magnified, from beneath. 

 Fig. 2. One of the Horn-like appendages more magnified. 



."5. The oviferous sac, attached to the upper part of the abdominal portion. 



4. End of the tail in the female. 



5. Tail part, of a younger individual, showing distinctly, its joints; 



which appear preternaturally contracted. 



6. o. Ovum greatly magnified ; b, giving birth to the Embryo. 



7. Larva when fully expanded, stiU more magnified. 

 S. Do. . after some days' growth. 



9. Do. . showing a greater approximation to the perfect animal. 



^ PLATE III. 



BRANCHIPUS SCHCEFFERI CStagnalisJ .—Fig. 1. Male of the natural size. 



Fig. 2. Magnified, with the horn-like appendages thrown forwards, to 



show the labrum and mandibles. — Fig. 3. Front view of the head. 



CHIEROCEPHALUS PREVOSTII.— Fig. 5. Male of the natural size, from beneath. 



Fig. 4. The curious and complicated apparatus, extended, which is situated 



between the roots of the Horn-like appendages, greatly magnified. 



ARTEMIS FABRICII (Branchipus PaludosisJ .—Fig. 6. Female, magnified. 



'plate IV. 



CHIEROCEPHALUS PREVOSTII.— Fig. 1. Female of the natural size. 

 Fig. .5. Ova. 6. Much magnified. 



7. Lar Yd in its first stage, magnified. 8. Do. second stage. 

 9. Do. . approximating to the perfect animal, of seven days' growth, 

 BRANCHIPUS SCHCEFFERI.— Fig. 2. Headof female magnified. 

 Fig. 3. Ova of do. 4. Do. more magnified. 



plate v. 



BUCEPHALITHUS.— Fig. 1. B. Tessini. 



Fig. 2. Head of Entomostracites Buchephalus of Wallenberg, probably the 

 female of the former. 

 3. B. Spinulosns, of medium size. 

 PARADOXIDES.— Fig. i. Gibbosus. 5. Scarabseus. 



/ 



plate VI. 



OGYGIA.— Fig. 1. O. Guettardi. 



Fig. 2. Part of the head and fore part of the body of Ogygia Desmaresti, of 

 large dimensions, probably the male of the former. 

 APUS. — Fig, 3. A. GuHdingi, xnaguificd licarly three times. 



