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



This species is omitted from the Brit. Mus. Catal., 1S62. 



At p. 40.3 (see Index and p. 47G) a new species, as Kr0yer supposed, is introduced under the 

 name CapreUa lo7igisprna, which he soon after transferred to the genus yE;/jraa. Ampelisca 

 rotundata (for which see Note on Liljeborg, 1852) is also according to the Index, men 

 tioned on p. 403 ; Amphithoe alioniaculata is said to be mentioned on the same page, and 

 the genus ^gina on p. 402, but these two pages I have not seen. 



In the Continuation, the description of Amphipoda begins at p. 476 with ^gina longispina, Kr. ; 

 this he found necessary to remove from Oaprella, in which he had previously placed it, 

 by reason of the mandibles having palps. He doubted whether it ought not to become the 

 type of a new genus, since he found rudimentary branchiae on the fifth perseon-segment, and 

 the pleon tri-articulate, without any trace of limbs or appendage. INIayer considers that the 

 supposed branchiaj were tlie external sexual organs of a female specimen, and agrees with 

 Spence Bate in identifying this species with FroteUa phasma, Montagu. 



The new genus " Siphonoecetes, novum Amphipodum genus, ad Gammarina gressoria referendum," 

 is thus described : — 



" Anfeniix superiores inferioribus multo breviores, subpediformes, flagello brevi, pauciarticulato ; 

 antennae inferiores pediformes. Onili baud conspicui. Mandihula angulo antico-interiori 

 profunde bifurcato, tuberculo molari denticulato, palpo brevi uniarticulato. Lahiuin 

 superius profunde bifidum vel duabus compositum lamiuis ovalibus ; labium inferius bifidum, 

 lateraliter productum et acuminatum. Ma.dJlx bilaminares, forma vulgari. PeJus 

 maxillareji palpo brevi quadriarticulato. Pedes tlwracici primi et secundi paris validissimi, 

 manu instructi subcheliformi. Pedes tertii et quarti paris articulo primo latissimo, laminari ; 

 articulo quarto obcordato, laminari, mauum prEebente, cujus ungvis efficitur articulo qvinto 

 subconico articuloque sexto aciculari. Pedes qriidi sextique paris minutissimi sed robusti, 

 recurvati, articulo primo clavato, ungve furcato. Pedes septimi paris graciles, reciu-vati, 

 articulo primo laminari, ungve minutissimo, furcato. Pedes ahdomindles primi, secundi et 

 tertii paris natatorii, breves, validissimi, parte basali latissima, rhomboidali ; pedes quarti 

 quintique paris saltatorii ; pes abdominalis sexti paris natatorius, unica instructus lamina 

 terminali." 



"Animal tubum inhabitat, e lapillis fragmentisque coucharum formutum." 



The type-species is described under the name of Siphonoecetes typims. Tab. vii. fig. 4, a-f. 

 Boeck thinks that Kr0yer has been led to describe the upper lip erroneously, by confusing 

 it with the lower lip. Boeck also says that Kroyer's figure of the last nropods is incorrect, 

 as he draws them with two small rami, though in fact there is but one, the prolongation of 

 the peduncle on the inner side giving the appearance of a second. In the present work the 

 last uropod is not figured, Boeck must therefore be referring to the Voy. en Scand., pi. 

 XX. fig. 1., in forgetfulness that Kr0yer has here described tlie uropod in question just as 

 Boeck himself does, but with the additional observation that, " Den fremspringende Vinkel 

 er i0vrigt ved en skraastribe afsat fra den 0vrige Roddeel, og kunde maaskee saaledes antyde 

 den ikko fuldt sondrcde indre swommeplade." It is this appearance, not a second ramus, 

 that is shown in the Voy. en Scand., pi. xx. fig. 1 u. Kr0yer places the genus nearer to 

 Gorophium than to Cerapus, and is followed in this view by Dana and Boeck. 

 He next describes Glauvumnne leucopis, n. s.. Tab. vii. fig. 2, a-e, as type of a new genus, 

 Glauconome, which he considers near to Isrlnjrocerus, these two genera in his opinion uniting 

 the Oammarina saltatoria and Gammarina gressoria. He thus defines Glauconome : — 

 " Antennas subpediformes ; superiores flagello ornatae appendiculari perparvo. Oculi minuti, 

 parum distincti. Mandibulaj apex in duos fissus ramos, qui dentibus sunt armati conicis ; 

 tuberculus molaris dentibus confertissimis instructus. Labium superius breve, depressum, 

 latissimum, margine anterior! medio inciso; labium inferius quatuor compositum laminis 

 setosis. Laminie maxillares pedum maxillarium dentibus armatoe validis ; ungvis palpi apice 



