UYl'KKID.K. 29:3 



Ilyporia T.iitifillii, I^tluttrds, Ann. ihs Sc. Nat. xx. p. ',ii<%. pi. 11 ; Hist. 

 (Its Crust, iii. p. 7ti. 



Jfliite, Cat. Ci-Kst. B. 31. 1847 cS: 1850 ; Jli^t. Brit. Crust, p. 206. 



pi. 11. f. 3. 

 Gusse, Marine Zool. p. 131). f. 251. 

 Metoechu-s Medusannn, iMiite, Hist. Brit. Crust, p. 207. 



Cephalon transversely ovate. Pereion considerably inflated. Pleon 

 much compressed. Eyes large, occupying all the antero-lateral 

 portion of the cephalon. Superior antenna) as long again as 

 the cephalon, or as long as the cephalon is deep ; peduncle 

 about lialf the length of the cephalon, the fii'st joint being longer 

 than the two succeeding ; flagcllum about three times as long 

 as the peduncle, slightly tapering to the extremity, having the 

 distal half exhibiting traces of imperfect anuulation. Inferior 

 antennae not quite so long as the superior ; peduncle longer than 

 the peduncle of the superior, penultimate joint of the peduncle 

 broader than the ultimate ; flagellum resembling that of the supe- 

 rior antennae, but not quite so long. First pair of gnathopoda 

 having the inferior angle of the meros but slightly produced ; the 

 inferior angle of the carpus but little produced anteriorly, though 

 somewhat deeply inferiorly, and ha-\-ing the margin fm-nished with 

 strong stiff spines ; propodos cylindrical, shorter than the carpus, 

 but less stout, armed along the inferior margin with a few very 

 minute but sharp denticles. Second pair of gnathopoda longer 

 than the first, ha\ing the inferior angles of both the meros and 

 carpus more advanced anteriorly than those of the first pair, 

 and armed with a few straight stiff sjjines ; propodos as long as 

 the carjjTis, but much more slender, imarmed along the inferior 

 margin ; dactylos short, slender, shaq). Pereiopoda subequal, 

 tolerably robust. Peduncle of the posterior pair of pleopoda 

 reaching to the apex of the rami of the preceding paii\ Telson 

 lanceolate. 



Length ^ths of an inch. 



Hah. Southern coast of Devonshire {Montarfu) ; Dublin coast, in 

 the pouches of Jihizostoma Ciwitri {IL/ndinau*) ; Jersey {Parker); 

 shores of France {M.- Edwards). 



The young of this species have been figured by Mr. Gosse in his 

 ' Naturalist's Kambles in Dcvonshii'e ;' they differ considerably from 

 the parent in genei-al aj)pearance : the jjcreion is very ])road, and not 

 dee]) ; the i)leon is narrow, and compressed against the pereion ; some 

 of the appendages appear also to be wanting. I coiild only make 

 out five pairs of jxida, including the gnathojjoda ; and none of the 

 pleoj>oda arc developed. Mr. Gosse figures some as rudimcntaiy, or 



» White's Brit, t'rust 



