J06 MODERN SYSTEM, 
Cancer Phasma. Montagu, Trans. Linn. Soc. vii. 66. t. 6./. 3. Leach , 
Supp. to Fficycl. Bril. i. 426. 
Inhabits the southern coast of Devon. , 
Astacus. alamos of Pennant and Squilla lohata of Muller belong to tri 
genus Caprella, of which in the British Museum there are several 
undescribed species. 
Sr LRrs 2. Body broad. 
Genus 16. LAKUNDA. Leach. Cyamus. Latr., Bose. PanopE- 
Leach. 
Antenna four-jointed, upper ones longest: fegs compressed, with strong 
claws; the third and fourth pairs elongate, spurious, cylmdric, with- 
out claws; the two anterior pairs monodactyle. 
External uterus, or pouch of die female, composed ol four valves. 
Sp 1 Lor. Cell. Bases of the third and fourth pairs of legs with pro- 
cesses resembling the figure 6; the hands of the second pair oi legs 
anteriorly, with three obtuse teeth. , 
Oniscus Ceti. Linn. Syst. Nat. i. 1060. Pall. Spec. *ool. ix. 4. f. l*- 
Snuille de la Baleiue. lie Geer, Mini, air let Tnsa-t. vii.pl. 42-/6, <• 
Pycrogonum Ced. Fabr. Supp. But. Sysl. 570. Cyamus Ceti. Latr- 
Gen. Crust, et Insect, i. 60. Pariope Ceti. Leach, Edin. Encycl. vh- 
404. Larunda Ceti. Leach, Trans. Linn. Soc. xi. 364. — Supp. to 
cycl. Brit A. -t26.pl. 21. 
Inhabits whales, and according to Latreille it is also found on som« 
species of the genus Scomber. 
By the Greenland fishermen it is termed the Whale-louse. 
Fam. IV. Idoteadaj. Leach. 
Boihi with all the segments not bearing legs: ( ventral appendages co- 
vered by two longitudinal plates.) 
Genus IT. IDOTEA. Fabr., Latr., Bose, Leach. Asellus. OhV> 
Lamarck. Entomon. Klein. , 
External antenna half the length of the body, or less; the third aO 
fourth joints ettoal : body ovate. _ 
Sp 1- Id.pelagka. Body linear-oval : tail rounded, the middle with 
very obsolete tooth : antenna: one third of the length of the hot J ^ 
Idotea pclagica. Leach, Truiis. Linn. Soc. xi. 365. — Supp. to Encycl. hi t ■ 
426. 
Inhabits the Scottish seas. . r c0 - 
Colour when alive ash-gray or fuscous, speckled with dark 
lour, and often variegated or mottled with white spots : legs pa «• ^ 
The female seems to be very rare, as amongst 400 specimens 
the animal, one only of that sex was found. 
Length one inch and a quarter. 
