CRUSTACEANS. Itt 



larger and two smaller antenna?, besides two eyes, aim situated in front 

 Tlic last segment terminates in an obtuse proje.-tiuu. and covera some 

 follicles at the extremity below. Of the four antenna? the two external 

 are half an inch lung, rather stout, and pointed, consisting of five articu 

 lations ; an internal pair, nearly in the middle between them, are shorter. 

 Tli. -iv an- fourteen limbs disposed as seven pair, each provided with a 

 irving claw ; fig. 8, a, limb ; fig. 8, 6. Colour dingy yellow, or 

 browni.-h \. llc>\\. with three or four white specks down the centre of the 

 back ; or it is altogether of variegated, mid some arc mottled. 



Thi- creature feeds voraciously, seizing and carrying off prey in it* 

 fore limbs. It also devours the smaller Crustacea and mussel very readily. 

 It swims swiftly, and when at rest it generally clings to some substan 

 admitting of its position supine. 



Kxuviation ensues at different seasons ; the shell has been always 

 cast in t \\.i portions. Perhaps tin- limbs are arranged in two divisions, 

 separated by a slight excess of the usual interval. 



The variegated specimens are beautiful animals, especially when (lot 

 appearing in their new shells. 



I have been induced to conclude that the number of segments is 

 only seven, though nine may appear from some delusion. 



PLATE LXIII. 



Fio. 5. Oniteut (IdtoUa) balihicut. 



6. Last segment of the same, enlarged. 



7. Cast shell, anterior portion, enlarged. 



8. Variegated specimen ; fig. 8, o, limb ; fig. 8, 6, antenue. 



9. Grccniah specimen. 



6. ONISCDS (!DEOTEA) ENTOMON. Plate LXIII. fig. 10, a. 



Several authors name this subject, but few seem to have had it 

 alive. The Boron dc Geer, who treats at large of various crustaceous 

 animals, observe-., that, never having seen a living specimen, he can say 

 nothing of its habits ; Tom. 7, p. 523. 



