APPENDIX. 375 



1. Pereionotus Testudo. B.M. 



Pereiouolus Testudo, Spmce Bate 4" Westwoud, Hist. Brit. Sessile-eyed 



i •rust. p. 228. 

 Ouiscus ti'Studo, Monttujtt, Linn. Trans, ix. p. 102. pi. 5. f. 5. 

 Leach, JEdiii. Encyc. vii. p. 405 (not Gosse 1^- White). 



All the segments of the peroion and the fii-st of the pleon elevated 

 into a strong dorsal carina ; each segment of the percion flat at 

 the top ; fii-st of the pleon produced posteriorly and terminating 

 in a rounded point ; three posterior segments of the pleon small 

 and feeble, inflexed against the inferior surface of the pereion. 

 Superior antennae short and robust, inferior small and feeble. 

 Four anterior pairs of appendages belonging to the pereion having 

 the coxae as deep as the segments to which they arc respectively 

 attached, and projecting outwardly inferiorly. Gnathopoda sub- 

 equal ; propoda not dilated, long and narrow ; palm short ; dactylos 

 reaching beyond the inferior margin of the palm. Pereiopoda 

 short and stout. Antepenultimate pair of pleopoda having the 

 peduncle rudimentaiy and the rami very long and foliaceous ; pe- 

 nultimate having the peduncle long and the rami long and styli- 

 form ; ultimate short, terminating in a very shoi't single ramus. 



Length ^ths of an inch. 



Hah. South Devon {Montagu). 



I was not aware of the preservation of this species in the collec- 

 tion of the British Museum imtil after the completion of this Cata- 

 logue. The specimen is a diied one, hence it has been mistaken by 

 Mr. Gosse for Owen's genus AcantJionotm, and I mifortunately fol- 

 lowed him. As soon as I became acquainted with its preservation, 

 the officers of the British ^luseum, with their usual liberality, gave me 

 permission to have this unique specimen at home for close examina- 

 tion. This, therefore, has enabled the author and Professor West- 

 wood, in their 'History of the British Sessile-eyed Crustacea,' to 

 give a carefully drawn figure and details, to which I would refer the 

 student. 



In consequence of this discovery, Acanthonotiis Testudo must lose 

 its sjjecific name. In the ' British Sessile-eyed Crustacea ' it is 

 named A. Owenii. 



Page 128. Add another species : — 



4. Acanthonotus parasiticus. 



Amphithoe parasitica, <SV/;-,s-, Orersiyt den Norsk-Arctiske Region fore- 

 konniteude Krvbsdyr.\). 11). 



" Resembles A. serratvs, but may be known by a carina in the dorsal 

 median line, commencing at the fifth segment of the pereion and 



