234 AMPHIPODA NORMALIA. 



two-thirds the length of the animal ; peduncle scarcely reaching 

 beyond the extremity of tlic penultimate joint of the peduncle of 

 the inferior pair ; Hagellum long and slender. Inferior antennae 

 not two-thirds the length of the superior ; last two joints of the 

 peduncle subcqual, the last more slender ; flagcUum slender, 

 scarcely longer than the last joint of the peduncle. Gnathopoda 

 subcqual, both pairs having the carpus nearly as long as, and con- 

 tinuous A\-ith, the propodos, together forming an imperfect oval ; 

 palm oblique, not defined, armed with a few hairs ; dactylos about 

 half the length of the inferior margin of the propodos. First two 

 pairs of pcreiopoda robust, basa slightly dilated ; thii'd pair 

 having the bases disk-shaped, scarcely as long as the anterior 

 squamiform dilatation of its coxa is deep ; last three pairs ha'vnng 

 the propoda obliquely truncate, and furnished with two short, 

 strong spines on the flexible margin. Posterior pair of pleo- 

 poda not extending beyond the two anterior pairs, ha^^ng the 

 inner ramus foliaceous, the outer terminating in two small hooks. 

 Tclson short, subtriangular. 

 Length i an inch. 



Hah. Devonshire coast {Montagu); Plymouth Sound (C. S. B.); 

 Strangford Loch {Tliomjpsoa and Hyndman, Ann. Nat, Hist, 1847), 



The colour of the adult animal, to the unassisted eye, is of a bright 

 crimson, spotted with a few large blotches of white ; under the mi- 

 croscope, this colour is observed to be due to a thickly-stellate pig- 

 ment covering a corneous ground. When yoimg, the animal is wholly 

 of this corneous hue, except a few white blotches ; when the animal 

 is somewhat grown, the same general colour prevails, but it is covered 

 with numeroiLS small spots of red, which, on close observation, are 

 seen to possess a more or less stellate character, graduallj' increasing 

 and ultimately spreading over the entire siu-face of the animal, until 

 it appears of a uniform red. 



This species generally builds its nest of small bits of weed, which 

 it binds together by a series of thread-like fibres that it secretes. 

 Its common resting-place is at the roots of Laminai'ioe, or in the 

 crevices between stones, &c. at the bottom of the sea, in a few fathoms 

 of water, 



2. Amphithoe littorina. (Plate XLI, fig. 2.) B.M, 



Amphithoe littorina, Spcnce Bate, Brit. Assoc. Report, 1855. 

 Ampliitlioe punctata, Johnston, Ann. Nat. Hist. xx. p. 243; Zool. 

 Journ. iii. p. 177. (Not Say.) 



Eyes small, ovate, Antennce subequal : superior one-thii-d the 

 length of the animal ; peduncle not so long as the flagellum, third 

 joint shorter than the preceding: inferior having the peduncle 

 longer than the flageUum. Gnathopoda uniform, subcqual : second 



