(i.\.\niAitii>.i';. o.» 



arc stylitbrm, unibranchcfl. the ramus biarticuliilc. The iclson is 

 simple and squamifurni. 



TJie ■jomis is luimod after Colonel Montagu, the indefatigable natu- 

 ralist who discovered the first species of the genus. 



1. Montagua monoculoides. (Plate VIII. fig. 4.) B.M. 



Moutagua monoculoides, MunUiyu, Trans. Linn, Soc. vol. xi.'p. 4, pi. 2. 



Spouc Bafc, Brit. Assoc. Report, 1855; Synop. Brit. Amph., Ann. 

 Nat. Hist. Feb. 1857. 



White, Hist. Brit. Crust, p. IGG, pi. 10. f. 2. 

 Typhis monoculoides, White, Cut. of Brit. Crust, in B.3L 1850. 



G\me, Mar. Zool. p. 140. fig. 2u2. 



Cephalon produced into a minute rostrum. Eyes roimd. Superior 

 antennae gradually lessening to the apex of the flagellum. Inferior 

 antenna; stouter than the superior ; the peduncle longer and the 

 flagellxmi shorter than the peduncle of the superior. Mandibles 

 baring the incisive edge serrated. Maxillipeds baring the jiro- 

 podos longer than the two preceding joints. First pair of. gna- 

 thopoda having the inferior angle of the carpus and meros not 

 much produced ; the inferior margin of the propodos parallel with 

 the upper ; palm oblique, short. Second pair of gnathopoda larger 

 than the first, but similar in form, having the palm shghtly convex, 

 and armed with two small spines at the inferior angle, where the 

 apex of the dactylos impinges. Pereiopoda subequal, each having 

 a sharp, strong, hooked dactylos ; the propodos slightly curved, and 

 furni.shed with two short strong spines upon the lower extremity 

 on the flexible side ; the coxa) of the three posterior paii*s are small, 

 of the two anterior very large, and, with one similarly developed 

 belonging to the second pair of gnathopoda, form a large lateral 

 shield upon each side, which protects the inferior and posterior 

 a])pcndages of the animal when rolled up. A row of equidistant 

 solitary hairs, placed within the extreme edge, fringc^s the margin 

 of the two posterior monstrous coxa). The bases of the ante- 

 penultimate pail' of pereiopoda is not squamiformly developed ; the 

 two posterior pairs have the basos S(juamiformly developed and 

 slightly crenated on the posterior margin. Kami of the penultimate- 

 pleopoda unequal. Telson ovate, scpiamiform, dorsally concave. 



L<.'ngth ^jths of an inch. 



The colour of this species is pink, \rith a large blotch of dee|)cr 

 colour upon the centre of the back. 



It a])]»ears to be not uncommon on our shores; it is u sublittoral 

 species probably all over Europe, being found beneath stones in pools 

 near low-water at spring tides. 



Thr first specimen was disco\ en-il bv Colonel Montagu on the Devon- 



