PLATE XIV. [Ptate 25.] 
SECTION 2.—PTER YGOTUS. 
Plerygotus ludensis, 
Fig. 1. Posterior portion of the body, reduced to two-thirds. 1a, the sculpture magnified. 
Fig. 2. A fragment of a large segment of the body. (Mr. Lightkody’s cabinet.) 
3. The anterior portion of a segment of the body. (Museum of Practical Geology.) 
Fig. 4. The left half of a penultimate segment. (Mr. Lighthody’s cabinet.) 
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. An endognath with its palpus. Fig. 6. The distal end of the third or fourth joint of 
the palpus. (Museum of Practical Geology.) 
Fig. 7. An endognath, probably of a second pair. (Mr. Lightbody’s cabinet.) 
Fig. 8. The basal joint of an ectognath, with short serrations. (Same cabinet.) 
Fig. 9. Part of the inner serrated lobe of a larger specimen. (Same cabinet.) 
Fig. 10. The fixed ramus of an antennary chela, with a toothed base. (Same cabinet.) 
From the Basement Beds of the Old Red Sandstone. Figs. 1 to 10 are from the Lud- 
low Railway. Figs. 11 to 13 are from Trimpley, N. of Bewdley, in Mr. G. E. Roberts’ 
collection. 
Fig. 11. A portion of a body segment, with prominent plicz. 
Fig. 12. Part of a telson, showing the central ridge, and the radiating lateral lines. 
Fig. 13. Parka decipiens, Fleming (ovisacs of Prery'gotus ?) ; the ova remote. 
Fig. 13*. Parka decipiens in a different state, the ova mutually compressed (see p. 243). 
Figs. 14 to 17 are from the Ludlow Railway. Fig. 18 from near the same Passage Beds, 
the Paper Mill, Ludlow. 
Fig. 14. Plerygotus problematicus? A segment of the body; the plice are few and 
minute. 
Fig. 15. A penultimate segment of the same species, showing the short anal (?) ridge on the 
sternal side. (Mr. Lightbody’s cabinet.) Perhaps both Figs. 14 and 15 represent 
only varieties of P. Zudens?s. 
Fig. 16. P. problematicus. Part of a large segment of the body. 16a. The sculpture 
magnified. 
Fig. 17. A portion of the carapace. 17a. The sculpture magnified. 
Fig. 18. An undetermined fragment, perhaps a portion of an ectognath. The sculpture is 
different in different parts of its surface. (Collection of Mr. H. Salwey.) 
