REPORT ON THE AMPHIPODA. 101 



other, first joint dilated, equal to that of the preceding feet, remaining joints small, nearly- 

 equal to each other, submoniliform ; two posterior pairs of feet reflected above the back ; 

 tail incurved, furnished on each side near the tip with a pedunculated bifid process, and a 

 minute, conic, acute papilla." The typo species, Cerajnis tuhularis, is further described 

 thus : — " Head with a mucronate carina before ; eyes oval, black. Hand and first joint of 

 the thumb of the second pair of feet with one or two obtuse teeth within. Body above 

 blackish, with irregular paler spots ; antennae and feet white, joints tipped with blackish ; 

 two hind pairs of feet and tail white. Inhabits a tube. Length about one-quarter of an 

 inch." Say would place it between Gammanis and Caprella, next to Jassa in the family 

 Podoceridoe of Leach. He cannot believe that the tube is fabricated by the Crustacean 

 itself, though he notices that it is always proportioned to the size of the inhabitant, which 

 moves actively with its neatly fitting house, making use of its four antennre as feet, and 

 deftly turning within its tube, if any impediment is ofifered to its progress in one direction. 

 It is figured in the following number of the Journal for September, 1817. 



1817. Stewart, Charles. 



Elements of the Natural History of the Animal Kingdom : comprising the 

 characters of the whole genera, and of the most remarkable species, particularly 

 those that are natives of Britain ; with the principal circumstances of their history 

 and manners. The second edition. In two volumes. Edinburgh, 1817. 



In the preface Stewart says tliat, as editor, "he has, with Cuvier and others, disjoined the 

 Crustaceous Animals from the Class of Insects, in which they had been included by 

 Linnaeus. In vol. ii. p. 308, after the Insects, he places the Class Articulata, containing 

 "two Orders, viz. 1. Crustacea, or those animals which constituted the genus Cancer of 

 Linn»us; and, 2. Arachnides, including the genera Aranea, Phalangium, etc." For this 

 arrangement he gives references to Latreille, Lamarck, and Leach (Edin. Encycl. vol. vii. 

 Crustaceology, and Mai. Pod. Brit. London, 1815. On pp. 316, 317, he gives under Cancer 

 the following section or group of species : — ■ 



" D. Antennx pedunculated and simple. 



" 32. Cancer grossipes. The claws want the finger ; the antennje the length of the body ; the 

 tail obtuse. Inhabits the European Ocean. B. — Pennant Briiisli Zool. 4. jyl. 16./. 31. 

 The linearis of Pennant. Pound in the sand on the shore of Flintshire and other places. 



"33. Cancer Pulex. With four claws which want the finger ; ten feet. ire/iafeVa- Europe. B. — 

 Degeer, Ins. 7. tab. 33. /. 1, 2. This species is very frequent on the shores of the sea ; like- 

 wise in fountains and rivulets ; it swims on its back, and leaps ; it causes ulcers on the gills 

 of fishes, and destroys the nets of fishermen ; it is eaten by the Avosetta ; it s bines in the 

 night. 



" 34. Cancer Locusta. With four claws, which want the finger ; fourteen feet ; the thighs 

 simple. Inliahits Europe. B.—Frisch . Ins. 7. fab. 18. Found very frequently on the sea 

 shore ; also in fountains and ditches, swimming on its back, and leaping. 



" 35. Cancer Atomos. Linear ; the claws wanting the finger ; with eleven feet. InJiahifs Europe. 

 B. — Pennant Brit. Zool. L pi. 12. /. 32. Found in fresh waters; hardly visible by the 

 naked eye ; a slender tail between the last pair of feet, makes the eleventh foot ; in the 

 middle two pair of oval vesicular. 



" 36. Cancer lobatiis. Linear ; four claws wanting the finger ; ten feet. Inhabits Europe. B. — 

 Muller, Zool. Dan. Icones, tab. 56. /. inf. This is the Squilla lobata of Muller's Zoologia 



