102 THE VOYAGE OF H.M.S. CHALLENGER. 



Danica ; it is found among the confervfe on the sea-shore at Leith ; but, perhaixs, is not really 

 different from the preceding species." 

 The two remaining species in the group are " Cancer salinus " and " Cancer stagnalis," not 

 Amphipoda. 



1818. Say, Thomas. 



An Account of the Crustacea of the United States. Eeacl June 10, 1818. 

 Journal of the Academy of Nat. Sciences of Philadelphia. Vol. i. part ii. Phila- 

 delphia, 1818. pp. 313-319. 



Here assigned to Order III. Amphipoda, Latr., is the nev7 genus Lanceola, thus described : — 

 "Essential Characters. — Antennx four, terminal joints not articulated; antennxform processes 

 above the mouth; caudal styles, three pairs, pedimcle depressed linear, supporting two 

 lanceolate lameUse. Natural Character. — Body soft, external covering membranaceous ; 

 head very short, transverse; ei/es longitudinal, placed opposite the base of the superior 

 antennEe ; clypeus projecting into an acute angle; front concave; antennx four, unequal, 

 inferiores longest, four-jointed, compressed, basal joints very short, third and fourth longer, 

 equal, the latter entire, superiores abbreviated, compressed, triarticulate, basal joints short, 

 robust, concealed by the clypeus, terminal joint not articulated, linear, compressed, obtuse ; 

 mouth protuberant; labrum emarginate, supporting two filiform, triarticulate processes, of 

 which the first joint is very short, second liuear, third shorter, subulate ; labium (pedipalpi) 

 bifid, closing the mouth, lacini» linear, inner edges hirsute, tij)s rounded ; thorax oval 

 convex above and beneath, seven-jointed, sutures imbricate ; feet fourteen, simple, two 

 anterior pairs compressed, terminal joints conic compressed, remaining pairs somewhat 

 cylindric, armed with a minute subterminal nail, sixth pair much the longest ; vesicular 

 hranchix oblong, distinct, placed at the inner base of the feet, excepting the first and 

 seventh pairs ; ahdomen abruptly much narrower than the thorax, of three subcyHndrical 

 segments, each furnished with natatory feet ; tail depressed, three-jointed, joints furnished 

 each with a lateral style, which consists of a foliaceous linear peduncle, supporting two 

 acute lanceolate, subequal lamella?, two anterior styles equal, posterior pair rather shorter, 

 terminal segment attenuated between the posterior styles." 



The type species, Lanceola pelagica, ?, is thus described : — " Antennx, inferiores more than half 

 as long as the thorax, superiores attaining the middle of the third joint of the inferiores ; 

 antennxform processes surpassing the second joint of the inferior antennte ; thorax, first 

 segment shortest, acutely angled before near the clypeus, second and third segments 

 longest, equal ; feet, anterior pair shortest, third, fourth, and seventh equal, fifth longer, 

 sixth longer than the thorax. Length one inch and one fourth. Inhabits — Gulf Stream. 

 Say further says that " it is allied to the Amphipoda by the vesicular branchiae and by the 

 caudal appendices to the genus Phronima, more than to any other of this order; in the 

 external appearance of the mouth there is a great similarity to the Linnean Onisdi, the labium 

 being nearly the same in form." Spence Bate, " in consequence of the obscurity of Say's 

 description," makes the genus a synonym of the later Vibilia, i\Iilne-Edwards. The species 

 he therefore calls Vibilia pelayica, not as Milne-Edwards had done Hyperia pelagica. 

 Bovallius, 1885, reinstates Lanceola as a distinct genus, assigning to it sis new species. 



