﻿PLATE VII. 



DEVONIAN CRUSTACEA. 



Order — Mero stom at a . 



Sub- Order — Eurypterida. 



Appendages of Pterygotm anglicus, Agassiz. Copied (with the exception of fig. 4) from 

 Plates VI and VII of Messrs. Huxley and Salter's Monograph, from the admirable 

 drawings of Mr. C. R. Bone. 



Fig. 



1. One of the chelate antenna, the largest known. Erom Forfarshire. Page 37. 



From Lady Kinnaird's Museum, Rossie Priory, Perthshire. 



2. Another specimen, smaller than fig. 1, but having three of the articulations preserved, 



p. 37. 



3. Chelate termination of an antenna, having the extremities of the chelas preserved, 



p. 37. 

 From the Watt Institution, Dundee. 



4. Antepenultimate joint of antenna, natural size. From Forfarshire, p. 37. 



In the British Museum. 



5. One of the mandibles or maxillas (endognath, Huxley), with the first three joints of 



its palpus, p. 37. 



From the Watt Institution, Dundee. 



6. Another similar appendage from the opposite side of the head, with four joints of the 



palpus preserved. 



From the Museum of Lady Kinnaird, p. 37. 



7. A detached mandible or maxilla, differing somewhat in form from figs. 5 and 6, p. 27. 



From the Watt Institution, Dundee. 



8. The second and third joints of a large palpus, p. 37. 



From Lady Kinnaird's Museum. 

 9 & 10. A maxilliped (ectognath, or swimming-foot), having the several articulations 

 nearly all united to the broad basal joint, which has, however, been broken off 

 at its serrated border, and is restored in outline at <z, p. 38. 

 From the Museum of Lady Kinnaird. 

 11. Part of a very large swimming-foot reduced to three fourths its natural size. The 

 letters refer to the corresponding joints in fig. 10, p. 38. 

 From the Museum of Lady Kinnaird. 



All these specimens are of the natural size except fig. 11. 



