ORCUKSTIDJS. 23 



M. Cuu'rin, mistaking this species for u Talitms, pliicefl it in his 

 tliird division of that genns, or those which have the first pair of k^gs 

 smaller than the second. 



Oiu- tigiirc and description are taken from tlie figiire given in 

 Savigny's work. 



12. Oi-chestia Capensis. (Plate IV. fig. 2.) B.M. 



Orchestia Capensis, Dana, U.S. Explor. Expcd p. 866, pi. 58. f. 3. 



MaU. — Eyes rather lai'ge. Upper antenna! reaching to the extremity 

 of the penultimate joint of the peduncle of the lower. Lower 

 antenna? half as long as the animal ; the flagcllum is not longer 

 than the last joint of the peduncle, which joint is nearly as long 

 again as the penultimate. Fii'st pair of g-nathopoda with the palm 

 indented or concave, and no tubercle on the carpus ; dactylos longer 

 than the palm and incurved. Propodos of second pair of gnatho- 

 poda well developed, and the palm deeply concave. Third pair of 

 pereiopoda shorter than the fourth, robust. The bases of the three 

 posterior pereiopoda disk-shaped. 



Length ^ths of an Inch. 



Hah. AustraKa. Dana found it at the Cape of Good Hope. 



13. Orchestia Deshayesii. (Plate IY. fig. 3.) B.M. 



Orchestia Deshavesii, Audouin, Saviqnij, Eq^ipte, Crust, pi. 11. f. 8. 

 ^V^ute, Cat Brit. Crust. B.3I.{ Hist.' Brit. Crust, p. 163. 

 Spence Bate, Report Brit. Amph. Brit. Assoc, 1855 ; Synojjsis of 



A}7iph. Ann. Nat. Hist. Feb. 1857. 

 Gosse, Marine Zool. p. 142. 



The last joint of the peduncle of the inferior antenna) longer than 

 the preceding. Propodos of the second pair of gnathopoda having 

 the posterior extremity of the palm armed with a strong tooth. 



Length -tf ths of an inch. 



This is a smaller and less common European species than either 

 0. littorea or 0. Mediterrmua, which latter it much resembles in 

 genertd appearance. The upper antenna; are rather shorter, scarcely 

 reaching to half the penultimate joint of the peduncle of the lower 

 antenna), whereas in 0. Mediterranea they reach quite to its extre- 

 mity. The last joint of the podimclc of the lower antenna) is con- 

 siderably longer than the preceding, whereas in 0. Mediterranea they 

 are subequal. But the great distinction lies in the second paii* ot 

 gnathopoda, the i)ropodos being furnished Avith a tliumb in tlie form 

 of a strong tooth at the posterior extremity of the palm. Tlie third 

 pair of pereiopoda arc shorter than the fourth and fifth ; the last pair 

 rcscmbh; the i)receding. 



We are not aware of many of this species haN-ing been taken. A 



