ANNULOSA : CRUSTACEA. 223 



The King-crabs are found in the Indian and Japanese Seas, 

 on the coasts of North America, and in the Antilles. They 

 sometimes attain a large size, and both the eggs and the flesh 

 are eaten by the Malays. 



Sub-order 2. Eurypterida. — "Crustacea with numerous, 

 free, thoracico-abdominal segments, the first and second (?) of 

 which bear one or more broad lamellar appendages upon their 

 ventral surface, the remaining segments being devoid of appen- 

 dage^ ; anterior rings united into a carapace, bearing a pair of 

 larval, eyes {ocelli) near the centre, and a pair of large, mar- 

 ginal, or sub-central eyes / the mouth furnished with a broad 

 post-oral plate, or metastoma, and five pairs of movable appen- 

 dages, the posterior of which form great swimming-feet; the 

 telson, or terminal segment, extremely variable in form ; the 

 integument characteristically sculptured." — (Heriry Woodward.) 



The Eurypterida are all extinct, and are entirely confined to 

 the Palseozoic period. Many of them attained to a compara- 

 tively gigantic size; Pterygotus Anglicus (fig. 70) being sup- 

 posed to have reached a length of probably six feet. In their 

 characters they present many larval features ; resembling the 

 larvae of the pecapoda especially in the fact that all the free 

 somites of the abdomen (except the two anterior ones) were 

 totally devoid of appendages. 



CHAPTER XXXIV. 

 MALACOSTRACA. 



Sub-class IV. Malacostraca. — The Crustacea of this sub- 

 class are distinguished by the possession of a generally definite 

 number pf body-segments ; seven somites gping to make up 

 the thorax, and an equal number entering into the composi- 

 tion of the abdomen (counting, that is, the telson as a somite). 

 The Malacostraca are divided into two primary divisions, 

 termed respectively the Edriophthalmata and the Podophthal- 

 mata according as the eyes are sessile, or are supported upon 

 eye-s,ta!ks, 



Division A. Edriophthalmata.— ^This division comprises 

 those Malacostraca in which the eyes are sessile,-and the body 

 is mostly not protected by a carapace. It comprises the three 

 orders, Lcsmodipoda, Isopoda, and Amphipoda. The eyes are 

 generally compound, but sometimes simple, and are placed on 



