24 AilPUirODA NOKilALIA. 



solitaiy specimen from the British coast, in Dr. Leach's collection 

 in the British iluseinn, enabled Mr. A. White to identify it with 

 Audonin's Kg)ptian species. 



Two specimens in the Collection of the ^Inseum at the PljTnouth 

 Athenanim were taken by the late Dr. Edward Moore, on the rocks 

 under Mount Batten. Professor Kinahan, who says they are local 

 and rare, has taken a few at Carrickfergus. 



We have never seen lining specimens ; bnt, jndging from dead ones, 

 it is of a somewhat lighter colour than the last species. 



14. Orchestia Mediterranea, (Plate IY. fig. 5.) B.M. 



Orchestia Mediterranea, Costa, Rend. clelfAccad. Sc. di Ncipoli, p. 171, 



1853. 

 Orchestia constructa (young ?), Costa, I. c. 



Orchestia la? vis, Spoice Hate, Si/no2)sis of British EdriopJdJiubnoKS Crus- 

 tacea in Ann. Nat. Hist. Feb. 1857. 

 White, Hist. Brit. Crust, p. 163. 

 Orchestia littorea (var.), 'l]lute, Hist. Brit. Crust, pi. 10. f. 1. 

 Orchestia littorea, Rathke, Fauna der Krym, t. 5. i. 1-6. 

 Lucas, jExp6d. dans VAlgerie. 



Upper antennae reaching quite to the extremity of the penultimate 

 articulation of the j^edimcle of the lower. The propodos of the 

 first pair of gnathopoda longer than the carpus. The propodos of 

 the second pair of gnathopoda in the male Avell developed, and 

 tapering towards the extremity, along the palm of which the dac- 

 tylos impinges, bnt not closely, except near the extremity. 



In this species the first segment of the pereion is very short, 

 and the coxa of the first gnathopod is almost enveloped by that of 

 the second. The first pair of gnathopoda have the propodos long 

 and cyUndi'ical, and fiuTiished on the posterior margin with a few 

 short hairs. The second pair of gnatho2:>oda are long and tapering, 

 very broad at the base, and gradually narrowed to the point of arti- 

 culation ^^•ith the dactylos ; the palm is rather concave ; the extre- 

 mity of the impinging ibiger bites into a groove. 



The second pair of gnathopoda in the female resemble the same 

 pair in Talitrus Locusta, in having the dactylos articulating remotely 

 from the apex of the propodos. The larvse resemble the female in 

 general characters, and particularly in the second paii* of gnathopoda. 



The tliii'd pair of perciopoda have the coxte equally divided, as in 

 Talitrus, and the whole organ is shorter than the fourth and fifth, 

 w^hich are subcqual. In the female and young these last two gene- 

 rally resemble each other : but in the adult male tlie posterior is 

 peculiarly developed, the carpus being as broad as it is long ; and 

 the moros triangular, the broadest diameter being connected Avith 

 the carpus, from whence it gradually deci'cases in width to the arti- 

 culation with the ischium, where it is reduced to the ordinary dia- 

 meter of the leg. 



