﻿BRITISH FOSSIL CRUSTACEA. 



BODY-RINGS OF THE CRUSTACEA, WITH THEIR APPENDAGES. 



principal antic orities.) 



I. Cephalic Somites (Huxley). 



I. 

 II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 



XVIII. 



XIX. 



XX. 



XXI. 



I. Cephalon. 

 (C. Spence Bate). 1 



1. Somite or Segment, bearing the Eyes. 



2. Ditto, bearing the 1st Antennae. 



3. 



4. 

 5. 



7. 



>> 



2nd Antennae. 





)> 



Mandibles. 





J> 



1st Maxillae, or 

 Siagonopoda. 



1st 



i> 



2nd Maxillae, or 

 Siagonopoda. 



2nd 



1) 



Maxillipeds, or 

 Siagonopoda. 



3rd 



II. 



Pekeion. 





1. Bearing the 1st pair of appendages 



or Gnathopoda, or 4th Siagono- 

 poda. 



2. The 2nd pair of appendages or 



Gnathopoda, or 5th Siagonopoda. 



3. The 3rd pair of legs, or 1 st Pereiopoda. 



4. „ 4th „ 2nd 



5. „ 5th „ 3rd „ 



6. ,, Cth „ 4th „ 



7. ,, 7th „ 5th „ 



III. Pleon. 



1. 1st Natatory legs or 1st Pleopoda. 



2. 2nd „ 2nd 



3. 3rd „ 3rd 



4. IstCaudal appendages, 4th ,, 



or 1st Uropoda 



5. 2nd 



6. 3rd 



5th Pleopoda, 

 or 2nd Uropoda 



6th Pleopoda, 

 or 3rd Uropoda 



7. Telson, Terminal joint, or middle tail- 

 piece. 



I. 

 II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 



XVIII. 



XIX. 



XX. 



(21.2) 



1. Somite, bearing the Eyes. 



2. „ „ ,, Antennules. 



3. 

 4. 

 5. 



6. 



„ Antennae. 



„ Mandibles. 



„ 1st Maxillae. 



„ 2nd „ 



II. Thoracic Somites. 

 1. Somite, bearing 1st Maxillipeds 



2. 



3. 



4A 



5 



» )> 



2nd 



3rd 



4th to 8th Somites, bearing Ambu- 

 latory legs. 



III. Abdomen. 



2 

 3 



4 



Each Somite furnished with a pair 

 of appendages. 



6 J 



"Telson," or median appendage, not 

 furnished with any articulate limbs. 2 



1 See Report on the " British Edriophthalma " (' British 

 Assoc. Report' for 1855, by C. Spence Bate, when these 

 terms were first introduced. See also ' History of British 

 Sessile-eyed Crustacea,' by C. Spence Bate, F.L.S., and 

 J. 0. Westwood, M.A., F.L.S., Part i, p. 3. October, 1861. 

 London : Van Voorst. 



s " The last segment never bears true appendages, and is 

 developed subsequently to the others from the dorsal surface 

 of the body. Hence we are justified in regarding it, not as a 

 somite, but as a peculiar median appendix to which the special 

 name ' telson ' [C. Spence Bate] may be applied." — See 

 Prof. Huxley's Lectures, ' Medical Times and Gazette,' 1857. 



