1'?" AMPnirODA JfORMAIJA. 



and slightly cunvd. Second piiir sliglitly larger than the first. 

 Pcrciopoda short, subccjual, fringed with a few short spines along 

 the flexible margin of the propoda. Posterior pair of pleopoda 

 longer than the preceding, stylifbrm, naked. Telson deeply di- 

 \dded, each division terminating in an acute point. 



Female. — Cephalon ha\ing a crest in the form of a high longitudi- 

 nally narrow tubercle, cmarginatc at the apex. Pereion and the 

 first three segments of the pleon having dorsal tubercles, only 

 just apparent on the anterior segments, and, though gradually in- 

 creasing, but moderately elevated upon the posterior. The rest as 

 in the male. Eyes round. Superior antenna) longer than the 

 inferior; the fij'st joint of the peduncle not armed with teeth. 

 Second pair of gnathopoda having the propodos ^\'ith a palm rather 

 longer than the inferior margin. Posterior pair of pleopoda b\it 

 little longer than the preceding. 



Length of the male -^ths, of the female -^ths of an inch. 

 Hah. (Arctic Asia ?) Voyage de Middendorff. 



The figures and descriptions are taken, from specimens sent by 

 Professor Brandt to the Museum at Paris, where I had an oppor- 

 tunity of examining and drawing them. M. Gucrin-Meneville also 

 has this species in his collection. 



38. DEXAMINE. 

 Dexamiue, Leach, Edinb. Encyc. vii. p. 43.3. 

 Antenna) long, subequal, slender : superior not aj)pendiculated ; pe- 

 duncle consisting of only two joints, the third not being distinguish- 

 able from the fii'st of the flagellum. Mandibles wdthout an append- 

 age. Gnathopoda subequal, feeble, subchelate. Coxa) of the third 

 pair of pereiopoda about half as deep as the preceding ; dactyla of 

 all the pereiopoda generally directed posteriorly. Posterior pair of 

 pleopoda biramous. Telson simple, divided, squamiform. 



1. Dexamine spinosa. (Plate XXIV. fig. 1.) B.M. 



Cancer (Gamniarus) spinosus, Montayu, Linn. Trans, xi. p. 3. t. 2. f. 1. 

 Dexamiue .^ipinosa, Leach, Edinh. Encyc. vii. p. 433 ; Zool. Misc. ii. 

 p. 23 ; Linn. Trans, xi. p. 358. 



Thompson, Nat. Hist, of Lreland, iv. p. 395. 



Dcstnarcst, Consid. stir fes Crust, p. 263. pi. 45. f. 6. 



White, Cat. Crust. B. M. 1847 ; Cat. Brit. Crust. B. M. 1850 ; 



Hist. Brit. Crust, p. 178. 

 Spence Bate, Brit. Assoc. Report, 1855 ; Si/nopsis, i^-c, Ann. Nat. 

 Hist. Feb. 1857. 

 Ampliitoe spinosa, Gosse, Ilarine Zool. p. 141. f. 200. 

 Anipliitoe Marionis, Edicards, Hist, des Crust, iii. p. 40 ; Ami. dcs Sc. 

 Nat. XX. p. 375 ; in Cuv. Riyjie Anim. pi. GO. f. 0. 



Cephalon produced anteriorly into a sliort, narrow, flat rostrum. 



