400 REV. T. E. K. STEBBING ON AMPHIPODA FEOM 



Uropods. These all have marginal spines on tlie peduncles and rami. 



Third it7'opods. The ramus is slender, shorter than the peduncle. 



Telson. This is peculiar, much longer than broad, composed of separate halves, wliich 

 appear to fold closely together, each carrying two apical spinules and two well-separated 

 marginal spines. 



Colour. Dusky in spirit. 



Length. About two-fifths of an inch, 10 mm. 



Hah. Australia, Manly Beach. Two specimens were forwarded to mc by Mr. Thomas 

 Whitelegge, of the Australian Museum, with the label, " Talorcheslla novoi-hollandicc. 

 H. Manly Beach." The specimens wore c? and ? . 



Talorchestia Deshatesii (Audouin). (Plate 30 A.) 



1825. Orchestia Deshayesii Audouin, Explication des Planches de Savigny, Atlas, j)l. ] I. fig. 8. 

 1893. Talorchestia Deshaye.n Clievreux, Bulletin de la Societe Zoologique dc France, vol. xviii. p. 127, 

 fig. in text. 



Por the remaindei' of the synonymy of tliis well-known species reference may be made 

 to the 'Challenger' Amphipoda and Delia Valla's Gammarini. The specimen here 

 figured is a young male. It exliibits a form of the second gnathopod closely agreeing 

 with that which Barrois lias figured as lielonging to an individual with eighteen joints 

 in the flagellum of the second antennae. The individual here" figured has tliat precise 

 number of joints in the flagellum. Professor Th. Barrois Avas the first to call attention 

 to the transformations througii which the second gnathopod passes in the male of this 

 species. It begins with a feebly chelate form. Gradually the palm becomes transversely 

 excavate and defined by a blunt double tooth. The tooth becomes single, the palm 

 becomes oblique, and finally in the adult stage there is an acute tooth, which, so far from 

 chelately overlapping a small finger, has shrunk back to the very base of the hand, and 

 a very long finger curves to meet it over a long straight extremely oblique palm. 



The specimen was obtained for the Copenhagen Museum from Constantin, in Algeria, 

 by Dr. Meinert. 



I have a specimen with the adult form of the gnathopod on one side, and on tlie 

 other the juvenile, the latter no doubt representing a limb that has been lost by some 

 accident. 



M. Ed. Chevreux Avas the first to show that in the female the fii-st gnathopod is simj)le, 

 so that the species is more properly referred to Talorchestia than to Orchestia. 



The species is frequently to be met with on the sandy shores of North Devon. Its 

 European distribution is very extended. 



Orchestia Stjlensoni, n. sp. (Plate 30 C.) 



The integument, as preserved in spirit, is membranaceous and iridescent. The third 

 and fourth pairs of side-plates are little deeper than the fifth and sixth. The third 

 pleon-segment has the postero-lateral corners quadrate, the point scarcely produced. 



Eyes not very large. 



