328 Rev. T. R. R. Stebbing on new 



The species was obtained in abundance during the months 

 of July and August of the present year (1891) on Woola- 

 combe and Saunton Sands, in North Devon. It burrows in 

 the sand after the fashion of Talitrus locusta, and occupies a 

 zone of the shore immediately below that in which the Talitri 

 are commonly found. Bright as its colouring is when 

 observed near to the eye, upon the sand it is very easily lost 

 sight of. By the lateral extension of the fourth pereeopods it 

 maintains an upright gait, although there is no dilatation of 

 the middle joints in either the fourth perseopods or the fifth. 

 When pursued its ingenuity in availing itself of the smallest 

 shelter is considerable ; its lioppings also are energetic, but 

 they cease sooner than those of the Talitri^ and the capture 

 is consequently rather easier. It swims in an upright 

 position, and when tired turns over, and so sinks gently to the 

 bottom. In a linger-glass half full of sea-water several speci- 

 mens lived in apparent content for four days. Some Talitri 

 in similar circumstances did the same. At the end of that 

 time they all sickened from a surfeit of boiled lobster supplied 

 by way of experiment ; and from want of time to attend to 

 their possible recovery, euthanasia was administered through 

 the medium of methylated spirit. On another occasion a 

 large male Talorchestia was detected holding a young com- 

 panion in its claw and feeding upon the still quivering little 

 victim. 



The following table may be useful as explaining the fine 

 distinctions which separate four very closely related genera : — 



Gn. 1, c?. Gn. 2, d. Gu. 1, $. Gn. 2, 5 . 



Talitrus, Latreille .... Simple. Feebly chelate. Simple. Feebly chelate. 



Orchestla, Leach . . . Subchelate. Strongly subchelate. Subchelate. Feebly chelate. 



Talorchestia, Dana . . Subchelate. Strongly subchelate. Simple. Feebly chelate. 



OrchestoidecCj'^iQ.QlQt. . Simple. Strongly subchelate. Simple. Feebly chelate. 



Thus in tlie male sex Talorchestia cannot be distinguished 

 from Orchestia^ and in the female neither Talorchestia nor 

 Orchestoidea can be distinguished from Talitrus. 



A new Species o/" Leptognathia. 



Leptognathia LiUjebo: gi^ sp. n., appears to approach Lepto- 

 gnathia longiremis (Lilljeborg) more nearly than any other 

 species of the genus, but at the same time to be very clearly 

 distinguished from it by the antennae, gnathopods, and 

 uropods. 



The body is very slender, more than eight times as long as 

 broad, parallel-sided except at the two exiremities. The 



