140 Canon A. M. Norman on British Amphipoda. 



1808. Orvhcstia Ih'shmicm, Delia ^"alk^ (lo'.M p. .")()7, pi. ii. iv^. A, 



pi. XV. lig!?. lo-30, pi. Ivii. figs. 70-73. 

 1893. Talorchestin De-^hai/esii, Chevreux, Bull, ile la Soc. Zool. ile 



France, vol. xviii. p. 1-7, fig. in text. 

 ISnU. Talorchcdia Dcshaycsii, Stebbing, " Ainpliip. from Copenbagon 

 Mns. and other sources, I't. 2," Traus. Linu. Soc , 2nd scr. Zool. 

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

 l>avroii!, in his paper rcfeiTetl to, gives very useful illus- 

 trations of the change of form in the second gnathopods of 

 the male during successive stages of growth ; and Stebbing, 

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

 young male. 



Ilab. Ryhope, Co. Durham [A. M. N.) : Miis. Nor. Mount 

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

 Distrib. Adriatic [Prof.' HeJltr) ; Naples {Delia Valle) : 

 Mas. Nor. Denmark {Meinert) ; Holland {Iloek) ; Western 

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

 Black Sea {Gzerniavsky). East coast of Africa {Hilyendorf). 



16. Orchestoidea brito (Stebbing). 

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

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



JIab. Woolacombe Sands, near Ilfracombe, North Devon 

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

 bing). 



JJistrib. Mouth of the Gironde, France {Chevreux). 



Undoubtedly the two preceding species belong to the same 

 genus. That described by Stebbing was placed by him in 

 the genus Talorchestia. Chevreux linding the gnathopods 

 of Orchestia Deshat/esii 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 titkc 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 male. 



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 the 

 finger can close. \\ here 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- 



