72 EXPLANATION OF PLATE 45. 



Eyes in front of the shield. See V. I. p. 393. (Ori- 

 ginal.) 



Fig. 2. View of the under surface of Fig. 1, shewing the 

 crustaceous legs beneath the shield (a), and the 

 swimming feet, bearing the Branchiae (e), beneath 

 the body (c). Scale, one seventh of nat. size. 



Fig. 2. e'. Swimming feet, (see Fig. 2 e,) enlarged to 

 the scale of Fig. 1. 



Fig. 2. e". Posterior surface of one of the swimming feet, 

 bearing the fibres of the Branchise. (Original.) 



Fig. 3. Front view of magnified figure of Branchipus 

 stagnalis. 3. Z>. The left eye mounted on a peduncle. 

 3. b'. The right eye still more magnified. (Original.) 



Fig. 4. Side view of Branchipus stagnalis, nat. size. 



Fig. 5. Magnified view of the back of Branchipus stag- 

 nahs. See V. I. p. 394. (Original.) 



Fig. 6. View of the back of a Serolis from Senegal, 

 given by M. Dufresne to Dr. Leach. See V. I. p. 

 392. (Original.) 



Fig. 7. View of the under surface of Fig. 6, shewing the 

 union of crustaceous legs with the membranous 

 branchiae, e.* (Original.) 



Fig. 8. Magnified view of the Branchiae at Fig. 7, e. 



Fig. 9. Back of Asaphus caudatus, from Dudley, in the 

 collection of Mr. Stokes. (Original.) 



Fig. 10. Side view of the left Eye of Fig. 9, magnified. 



Fig. 10'. Another Eye of Asaphus caudatus, in the col- 

 lection of Mr. Bright, from the W. side of Malvern 

 Hill. In the front of this fossil are circular depres- 

 sions on the stone, from which the petrified lenses 

 have fallen out; on each side, the lenses remain in 

 their natural place. (Original.) 



* Figs. 3, 6, 6 and 7, are from original drawings by Mr. Curtis in 

 the collection of Mr. C. Stokes. 



