lloplocayida — Stoniafopoda. 47 



to the common Gainniai'Hs, found in Lake Baikal ; and that the Table-case 

 little Chclura terebrans is, of all Amphipoda, perhaps the most -'^°- '• 

 directly important to man on account of its destructiveness to 

 marine timber referred to above (p. 42). 



The members of the Sub-order Hyperiidea can generally be 

 recognised by the very large eyes, which may cover almost the 

 whole surface of the head. The first thoracic limbs (maxillipeds) 

 are reduced. Most of the species are pelagic in habit, living at the 

 surface of the open sea. One of the most remarkable is Phronima 

 scdentaria which lives on various pelagic organisms, like jelly- 

 fishes and salps, and often carries about with it as a kind of cloak 

 the remains of its prey. One of the two specimens here shown is 

 enclosed in a barrel-shaped case, the remains of a swimming-bell 

 of one of the Siphonophoran jelly-fishes. 



In the Sub-order Capeellidea the body is either slender and 

 thread-like (CapreUidae), or broad and flattened (Cyamidae). The 

 abdomen and its limbs are vestigial. 



The CapreUidae (Fig. 28) are generally found among Zoophytes 

 or seaweeds. A group of specimens mounted in natural sur- 

 roundings is shown in Wall-case No. 4. 



The Cyamidae, or " Whale-Lice," are parasitic on Whales, and 

 are sometimes found in large numbers clinging to their skin. 



Division 4.— HOPLOCARIDA. 



Four or five of the posterior thoracic somites are free Table-case 

 from the carapace. There is no brood-pouch. Two movable • 

 segments are separated from the anterior part of the head, 

 bearing respectively the pedunculate eyes and the antennules, 

 and there is a movable rostral plate in front of the carapace. 

 The first five pairs of thoracic limbs are subchelate, and the 

 second pair are very large. The last three pairs carry exopodites. 

 There are tufted gills borne by the first five pairs of abdominal 

 appendages. 



This division includes tlie single order Stomatopoda, the 

 members of which are abundant in the warmer seas. They are 

 generally easily recognised by the characteristic form of the large 

 claws, which are not pincer-shaped, like those of Lobsters and 

 Crabs, but have the last segment shutting down, like a knife-blade, 

 on the segment l)efore it. 



One species of Squilla [S. dcsmaresiii) occurs occasionally 



