270 AMPniPODA NOKMALIA. 



2. SiphoncEcetus Whitei. (Plate XLV. fig. 10.) B.M. 



Ccrapus Wliitei, Gussc, Nat. llamblvs Devonshire Coast, p. 383. pi. 22. 

 f. 12 ; Murwr Zool p. 140. f. 253. 

 White, Hid. Brit. Crmt. p. 191. 

 Siplioiiu'cetus Kroveranus, Spruce Bate, Synopsis, 8fC., Ann. Nat, Hist. 

 Feb. 1857. 



'f]lnte, Hist. Brit. Crust, p. 19G. 



Without a rostmm. Superior antennas one-foiu-tli the length of the 

 animal; fii'st joint of the peduncle shorter than the cephalon, 

 second and third about the same length ; flagellum consistmg of 

 three articuli, fii-st articulus rather longer than the last joint of 

 the peduncle. Inferior antennae but little longer than the supe- 

 rior. Gnathopoda subequal ; propodos ovate, tapeiing, palm not 

 defined ; dactylos of the second pair serrated upon the inner mar- 

 gin. First two pairs of pereiopoda having the basa dilated, carpi 

 broad, propoda ciu^ved, dactyla straight, styliform ; third and 

 fourth pairs subequal, having the carpi very short, i^ropoda straight, 

 dactyla double-pointed, anteriorly dii-ected ; posterior pair longer 

 than the preceding, having the carpus as long as tlie propodos, and 

 the dactylos double -pointed, posteriorly directed. 



Length -:^ths of an inch. 



Hah. Weymouth {Prof. Willimnson) ; IKracombe, in tubes attached 

 to tufts of Cliondrus crisjnis (Mr. Gosse). 



3. Siphoncecetns typicus. (Plate XL VI. fig. 1.) 



Siphonoecetus t\-picus, Ej-iiyer, Nat. Tidshr. i. p. 491: Voyage en Scand. 

 pi. 20. f. 1. ■ 



Superior antennae one-thii'd the length of the animal, ciliated ; first 

 joint of the peduncle longer than the cephalon, second not so long 

 as the fii'st, third stiU shprter ; flageUum scarcely longer than the 

 last joint of the peduncle. Inferior antennae having the pedimcle 

 reaching beyond the extremity of the superior antennae; ante- 

 penultimate joint longer than the first joint of the superior i^air, 

 penultimate and ultimate joints subequal ; fiageUum not so long 

 as the last joint of the peduncle, having the last articulus laterally 

 tipped with two stout spines, and the antepenultimate tipped with 

 one spine on the upper surface. First pair of gnathopoda long- 

 ovate ; palm armed with three sharp teeth or spines, the posterior 

 of which defines its limit ; dactylos scarcely luUf the length of the 

 palm. Second pair of gnathopoda having the meros inferiorly 

 produced nearly to the extremity of the carpus, carpus continuous 

 with the propodos ; propodos ovate, tapering, palm not defined, 

 armed with several short teeth or spines ; dactylos nearly as long 



