106 



MODERN SYSTEM, 



Cancer Phasma. Montagu, Trans. Linn. Soc. vii. 66. t. 6.f. 3. Leacli, 



Supp. to Encijcl. Brit. i. 4'2(3. 

 Inhabits the southern coast of Devon. 

 Asfacns atomos of Pennant and Squilln lohata of IMiiller belong to the 



genus Caprella, of which in the British Musemn there areseveral 



imdescribed species. 



Stiri'S 2. Bodij broad. 



Genus 16. LARUNDA. Leach. Cyamus. Lutr., Bosc. Panope. 



Leach. 

 Antenna four-jointed, upper ones longest: /fg.5 compressed, with strong 

 claws ; the third and fourth pairs elongate, spurious, cylindric, withr 

 out claws; the two anterior pairs nionodactyle. 

 External uterus, or pouch of the fenialr, composed of four valves. 



Sp. 1. Lar. Ceti. Bases of the third and fourth pairs of legs with pro- 

 cesses resemliling the figure 6 ; the hands of tiie second pair of legs 

 anteriorly, with three obtuse teeth. 



Oniscus Ceti. Linn. S^st. Nat. i. loGO. PaU. Spec. Zool. ix. 4. /, 14. 

 Squille de la Baleine. De Geer, Man. surles Insect, \n.pl. 42./. 6, 7. 

 Pycrogonum Ceti. Fubr. Snpp. Enf. Si/sl. 570. Cyamus Ceti. Latr. 

 Gen. Crust, ct Insect, i. 00. Panopc Ceti. Leach, Ldin. Encijcl. vii. 

 401". Larunda Ceti. Leach, Trans. Linn. Soc. xi. 3C4. — Snpp. to En- 

 ci/cl. Brit. I. A'l6. pi. 21. 



Inhabits whales, and according to Latreille it is also found on some 

 species of the genus Scomber. 



By the Greenland fishermen it is termed the Whale-louse. 



Fam. IV. looTEAD.i:. Leach. 



Bfldi/ with all the segments not bearing legs : {ventral appendages co- 

 vered by two longitudinal plates.) 



Genus 17. IDOTEA. Fabr., Latr., Bosc, Leach. Asellvs. Ohv., 

 La)narck. Entomox. Klein. 

 Exlernul antenna half the length ol' the body, or less; tlie third and 



fourth joints equal: hoc] i/ ovate. 

 Sp. 1. Id. pelagica. Body linear-oval: tail romided, the middle with a 

 very obsolete tooth : antenna; one third of the length of the body. 

 Idotea pelagica. Leach, Trans. Linn. Soc. xi. 365. — Supp. to Encycl. Brit. i. 



426. 

 Inhabits the Scottish seas. 



Colour when alive ash-gray or fuscous, speckled with darker co- 

 lour, and often variegated or mottled with white spots : legs pale. 



The female seems to be very rare, as amongst 400 specimens of 

 the animal, one only of that sex was found. 

 Length one inch and a quarter. 



