PLATE VII. 
DEVONIAN CRUSTACEA. 
Order—MEROSTOMATA. 
Sub- Order —EuRYPTERIDA. 
Appendages of Pterygotus anglicus, Agassiz, Copied (with the exception of fig. 4) from 
Plates VI and VII of Messrs. Huxley and Salter’s Monograph, from the admirable 
x 
drawings of Mr. C. R. Bone. 
Fig. 
1. One of the chelate antenna, the largest known. From 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, 
Pasir 
3. Chelate termination of an antenna, having the extremities of the chele preserved, 
po. 
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 maxillz (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 a, 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. 
