140 Canon A. M. Nonnan on B)\tish Ampliipoda. 



1893. Orchestia Deshayesii, Delia Valle, (139) p. 507, pi. ii. lig. 5, 



pi. XV. figs. 15-30, pi. Ivii. figs. 70-73. 

 1893. Talorchestia Dea/mt/esii, Chevreu.x, Bull, de la Soc. Zool. de 



France, vol. xviii. p. 127, fig. in text. 

 1899. Talorchestia Deshayesii, Stebbing, " Ampliip. from Copenhagen 

 Mns. and other sources. Ft. 2," Trans. Linn. Soc , 2nd ser. Zool. 

 vol. vii. p. 400, pi. xxs. a. 

 Bavrois, in liis paper referred to, gives very useful illus- 

 trations of the change of form in the second gnathopods of 

 the raale during successive stages of growth ; and Stebbing, 

 also in the last-quoted memoir, figures the gnathopod of a 

 young male. 



Hah. Ryhope, Co. Durham [A. M. N.) : Mus. Nor. Mount 

 Batten, Devon (Par/«),sandy shores of North Devon {Stebbing). 

 Distrih. Adriatic {Prof. Heller) ; Naples {Delia Valte) : 

 Mus. Nor. Denmark {Meinert) ; Holland {Hoek) ; Western 

 France {various authors) ; Mediterranean {various authors) , 

 Black Sea {Czerniavsky). East coast of Africa {Hdgendorf). 



16. Orchestoidea hrito (Stebbing). 

 1891. Talorchestia brito, T. R. R. "Stebbing, Sessile-eyed Crustacea," 

 Ann. & Mag. Nat. Hist. ser. 6, vol. viii. p. 327, pi. xv. 



Hah. Woolacombe Sands, near Ilfracombe, North Devon 

 {Stebbing) : Mus. Nor. Saunter Sands, North Devon (Steb- 

 bing). 



JJistrib. Mouth of the Gironde, France (Ghevreux). 



Undoubtedly the two preceding species belong to the same 

 genus. That described by Stebbing was placed by him in 

 the genus Talorchestia. Chevreux tinding the gnathopods 

 of Orchestia Deshayesii in their general character corresponded 

 with those of 0. brito, removed the former species to Talor- 

 chestia, and in this he has been confirmed by Stebbing. 

 This allocation of the forms I cannot but regard as mistaken. 

 To tiikc Stebbing's characters of two closely-allied genera : — 



Talorchestia. First gnathopods subchelate in the male, 

 simple in the female; second gnathopods strongly 

 subchelate in the male. 



Orchestoidea. First gnathopods simple in the male and 

 female ; second gnathopods strongly subchelate in raale. 



I am at a loss to understand how the first gnathopod male 

 of Talorchestia brito and Orchestia Deshayesii can be called 

 subchelate. This expression implies a palm against which tbe 

 finger can close. Where is such a palm in these gnathopods ? 

 There is a tubercle near the extremity of the hand, but if the 

 gnathopod possesses any grasping power I take it that it 

 would be by the approximation of this tubercle with another 

 which is situated on the wrist ; but if this is so it would make 

 the limb not subchelate but complexly subchelate. Exa- 



