SCHIZOPODA AMPHIPODA. 
Crust. 11 
Nebaliid^. 
Nebalia longipes, sp. n., Willemoes-Suhm, Tr. L. S. (2) i. (1875), p. 26, 
pi. vi., Bermuda Islands. Ou the structure of this species as well as 
N. geoffroyi (M.E.), its sexual differences and circulatory systems, see 
Claus, Untersuch. Crust, syst. pp. 24-30, pi. xv. 
GUM ACE A. 
Diastylis polaris, stygia, Leucon pallidus^ Eudorclla gracilis (Sars), 
and Campylaspis ruhicunda (Lillj.) [see Zool. Rec. ix. p. 195], all from 
the Polar Sea, fully described and figured by G. O. Sars, Sv. Ak. Handl. 
xi. (1873) No. 6, 12 pp. 1 pi. D. spnnulosa, sp. n., Heller, Denk. Ak. 
Wien, xxxvi. (1875) p. 28, pi. i. fig. 5, Arctic Sea. 
Family ?. 
Amphion. Two pelagic forms nearly allied to this genus, and pro- 
vided with fully-developed genital organs, observed by Willemoes-Suhm, 
P. R. Soc. xxiv. pp. 132 & 133 ; Ann. N. H. (4) xvii. p. 162 ; and Z. wiss. 
Zool. xxvii. p. cvi. Claus was inclined to regard Amphion (M.E.) as a 
larva belonging to the Sergestidos, and the animal as described first 
by Milne-Edwards is certainly one ; it has only 6 pairs of developed 
natatory feet, the first two of which are the second and third maxillipeds, 
and the four following true feet, the fifth not being developed. Milne- 
Edwards described the under lip as first maxilla, the first maxilla as 
second, and so on. But the observations of Willemoes-Suhm show that 
with only slight changes Amphion becomes a sexually developed perfect 
animal. Claus, Untersuch. Crust, syst. pp. 47-49, 112 & 113, pi. viii. 
figs. 8-10. 
AMPHIPODA. 
J. C. ScjiioDTE distinguishes and describes three typos of oral structure 
in this order : — 
1. Eleutherognatha : Maudibulae trigonoo, condylo articulario antice 
carentes. Labrum planiusculum, transversum, simplex. Greater 
part of the Gammaridce and Caprellidoi. 
2. Trochalognatha : Mandibulae products, condylo articulario in- 
structs antico, acetabulo epipharyngis accommodate. Labrum 
crassum, conicum, simplex. Lysianassa, including Anonyx, and 
Opis. ' 
3. Pie?:ognatha : Mandibuls products, condylo articulario antico 
carentes, mala exteriore fosss transverss labri accommodata. La- 
brum planiusculum, trans^srsum, duplex. Eyperiidm. 
The first type corresponds with that of the Onisciy the second with that 
of Cirolana among the Isopods, and also with that of Scolopendra among 
the Myriopods. The genera Stegocephalus^ Cyamus, and Laphystius 
