AMPHIPODA. 455 



passages iu mud. Ct'rapHxtitlmldris Say., lives in tubes. Podoet'nix ra 

 Leach., English coast. Chiinni tn-i-lti-nns Phil, is allied here, gnaw-, with 

 Lininnriti lii/nornm. wood-work in the sea. North Sea and Mediterranean. 



Fam. Orchestiidae. Anterior antenna? usually short, always without accessory 

 ramus. The posterior pair of uropoda are unbranched and are shorter than 

 tli'- preceding pairs. They live on the shore, especially on sandy beaches, and 

 move by springing. TaHtntx salt <t tor }l<mt. = T.locuxt Latr. On the sandy 

 coasts of Europe. Orclicatla Jittorrn Mont.. North Sea. 



Fam. Grammaridae. The anterior antenna? often have a second ramus. which 

 is always longer than the shaft of the posterior. The coxal plates of the four 

 anterior pairs of legs are very broad. They move more by s-i -Timing than by 

 springing. Gnmnittrux jilr.r L.. G.tftn-ititilix Ros., G. marunix Leach. In the 

 blind Xiphari/iis Schiodte the crystalline cones and eye pigment are wanting. 

 X. puteanux Koch., in deep springs and lakes (Lake of Geneva). Ltjzioimxxti, 

 Cxt,r Ivlw., Mediterranean. L. atlanticn Ed\v. L. magi'llnnicd Lillj. 



Tribe 3. Hyperina. 



Aiiiphipoda with large swollen head and large eyes, usually divided 

 into frontal and lateral eyes. They have a pair of rudimentary 

 maxillipeds functioning as underUp. 



The antennae are .sometimes short and rudimentary, sometimes of 

 considerable size, and in the male are elongated into a multiarticulate 

 fiagellum (Hyp&ridce), The posterior antenna? may in the female be 

 reduced to the basal joint enclosing the glandular tube (Phromina) ; 

 in the male, on the contrary, they are folded in a zigzag, after the 

 manner of a carpenter's rule (Platyscelince). A. paired auditory 

 vesicle may be present above the brain (Oxycephalus, Rhabdosoma}. 

 The maxillipeds form a small bi- or tri-lobed under-lip. The paired 

 legs end in some cases in a powerful chela. The caudal styles are 

 sometimes lamellar and fin-like, sometimes styliform. Development 

 takes place by metamorphosis. They live principally in jelly-fish, 

 and swim very rapidly. 



Fam. Hyperidae. Head globular, almost entirely occupied by the eyes. The 

 two pairs of antennae have a multiarticulate shaft ; the fiagellum longer in the 

 male. The mandible has a three-jointed palp. The fifth pair of feet is gener- 

 ally formed like the sixth and seventh, with claw-like terminal joint. Hijpcrla 

 (Lcxtrii/oniis Edw.) mrdiisnntm 0. Fr. Mull. (//". f/alba Mont. = 77". Lntrt-iUi 

 Edw.) with Lcxtriijonxx <:i-ul<tn* Kr. as male, North Seas. 



Fam. Phronimidae. Head large, with projecting rostrum and large divided 

 eye. The anterior autennfe are short in the female, with only two or three 

 joints, in the male with long multiarticulate nageilum and a shaft closely 

 beset with olfactory hairs. The thoracic limbs have in some cases powerful 

 chelae. Pltroxina nlcteoisix Edw.. Phroniitiu sedentaria Forsk. The female 

 lives with its offspring in Pi/ri>xiniiii and Diphyidce, Mediterranean. 



Fam. Platyscelidae. Both pairs of antenna; hidden beneath the head : the 

 anterior are small ; in the male with much swollen bushy shaft, and short, 



