34 AMPHirODA NOBMALIA. 



consists of about eighteen articulations. First pair of gnathopoda 

 having the propodos dilated into a broad palm, and a tubercle upon 

 the inferior margin of the carpus ; the dactylos armed with two 

 spinides on the interior margin. Second pair of gnathopoda having 

 the propodos oval ; palm convex, fringed with eqvudistant solitary 

 cilia, and defined at the inferior angle by a small tooth. Posterior 

 pair of pereiopoda having the carpxis dilated. Telson emarginate. 



Female. — First pair of gnathopoda having the inferior margin of the 

 propodos parallel with the superior ; palm short, shorter than the 

 dactylos. 



Length five lines. 



Hah. Isknd of Riigen, on the stony beach between Sassnitz and 

 the Stubenkammer, in great quantities {Fr. Miiller). 



30. Orchestia Gryphus. (Plate V. fig. 10.) 



Orchestia Gryphus, Ft: 3Ii(ller, Wiegm. Archiv fiir Naturq. p. 62, pi. 4. 

 f. 18, 1848^ 



MaJe. — Eyes round. Superior antennje shorter than the cephalon. 

 Inferior antennae about half the length of the animal; penulti- 

 mate joint of the peduncle about half the length of the xdtimate ; 

 flagellum consisting of about twenty articulations. First pair 

 of gnathopoda having the inferior margin of the propodos parallel 

 with the superior ; the palm defined by a tubercle ; dactylos armed 

 with a single spinule upon the interior margin ; carpus with a 

 tubercle upon the antero-inferior margin. Second pair of gna- 

 thopoda ha%-ing the propodos long, tapering ; palm almost parallel 

 with the upi^er margin, fringed mth cilia, the inferior angle pro- 

 duced anteriorly into an immense tooth about half as long as the 

 propodos ; dactylos fringed upon the inner margin with equi- 

 distant, short, solitary hairs. Posterior pair of pereiopoda having 

 the carpus not dilated. Telson emarginate. 



Length four lines. Smooth and shining. 



Hah. Island of Riigen, on the sandy shores between the Peerd 

 (near Monchgut) and the Kiekower, associated with TaJitms Locust a. 

 A single specimen only was found {Fr. Midler). 



5. ALLORCHESTES. 



AUorchestes, Dana, U.S. Explor. Exped. p. 883. 



Superior antennae as long as the peduncle of the inferior. The 

 basal articulations imperfectly fused into the facial wall of the 

 cephalon. Olfactory spine nidimentaiy. Mandibles without an 

 appendage. Maxillipeds furnished with pointed dactylos. Both 

 pairs of gnathopoda subcheliform 



