286 



AMPinPOn.V XORMALIA, 



tooth. Eyes small, round, distant. Superior antennae scarcely longer 

 than the peduncle of the inferior ; peduncle having the joints sub- 

 equal; flagcllum shorter than the peduncle, stout, having sLx articuli; 

 secondary appendage slender, minute. Inferior antenna) about half 

 the length of the pcrcion, each succeeding joint of the peduncle 

 increasing in length and diameter, furnished \vith long hairs; 

 flagcllum long-elliptic, laterally compressed, thickly fringed with 

 long hairs. First pair of g-nathopoda chelate, having the carpus 

 shorter than the propodos ; propodos oblongo-quadi-ate, margins 

 almost parallel, infero-antcrior angle produced anteriorly to less 

 than a right angle, pahn straight ; dactylos capable of impinging 

 at the apex only. Second pah' of gnathopoda having the cai-pus 

 longer than the propodos ; propodos not broader than the cai-pus, 

 having the antero-inferior angle produced anteriorly to an acute 

 angle, vrhich, with the short ciu'vcd dactylos, forms a perfect 

 ctela. Three posterior pairs of pereiopoda having the basa not 

 broadly developed ; the mera broadly developed posteriorly ; pro- 

 poda armed with short, strong spines on the anterior margin. 

 First thi-ee pairs of pleopoda short, having their basal joints 

 squamosely developed, and furnished with two hooked spines and 

 a few plumose cilia ; antepenultimate pair ha\-uig the peduncle 

 long and the rami short ; penultimate pah' having the peduncle 

 developed into a broad squamose plate, the rami short, equal hi 

 length, but unequally broad ; ultimate parr having the peduncle 

 short and the ramus long. Telson pedunculated and broadly 

 lanceolate. 



Female. — The large dorsal tooth upon the thh-d segment of the pleon 

 is much shorter than in the male, and straight. The peduncle of 

 the penultimate pah' of pleopoda has the squamose plate more 

 quadrate, and the ramus of the posterior pair of pleopoda much 

 shorter. 



Length of male -^(jihs, of female -^ths of an inch. 



Hah. In submarine timber, being one of its most destructive agents. 

 It is found associated with Lbnnoria Ugnorum, probably aU. round 

 Europe. Plymouth (C. S. B.) ; Polperro {Mr. Lonr/Jirin) ; Falmouth 

 (Bev. A. M. Nonnan); DubKn Bay (Messrs. MuUins',BaU, and Thomp- 

 son) ; Ayrshh-e (Ardrossan) {Major Martin andiRcv. A. M. Norman); 

 Britain {Dr. Leach); Trieste {Prof. Philipjpi). 



