6 
Expedition i Biscay erbugten gjort opmserksom herpaa og 
tillige paapeget, at clen her omhandlede Form stutter sig 
meget nser til den af Stimpson 1 under Bensevnelsen Seym 
wmbonata kortelig characteriserede Krabbe fra Havet om 
Florida. Milne Edwards foreslaar at oprette for begge disse 
Former en ny Shegt under ovenstaaende Navn. 
Angaaende denne Slaegts systematiske Stilling og For- 
hold til de ovrige bekjendte Oxyrhyncher, synes det efter 
0ienhulernes Bygning og andre Cbaracterer klart, at den 
maa henfpres til Familien Majidce, i den Begrsendsning 
hvori denne Familie for Tiden ialmindeligbed opfattes, alt- 
saa temmelig fjernt saavel fra Slsegten Amathia som fra 
Scyra, hvoraf den ibrste tilliorer Familien Tnachidm, og den 
sidste Familien Periceridce, ifolge den nylig af E. Miers givne 
Revision af OxyrhyncherneS Blandt Majiderne igjen til- 
horer den utvivlsomt Underfamilien Majince og slutter sig, 
som det synes, naermest til Slsegten Hyastenus White, hvis 
Arter vsesentlig stammer fra den nordlige Del af det stille 
Ocean. 
1. Scyramathia Carpenteri, (Norman). 
(PL I, Fig. 1—7). 
Syn: Amathia Carpenteri, Norman, i Wyville Thomson's: “The Depths 
of the Sea”, pg. 17. r >, Fig. 35. 
Artscliaracteristie. Legemet overalt tset og kort 
laaddent. Rygskjoldet noget lsengere end bredt, bagtil i 
Midten udbuet, oventil stserkt hvselvet samt forsynet med 
9 stumpe Forhpininger, hvoraf de 3 tilliorer Maveregionen, 
1 Hjerteregionen, 2 hver Gjelleregion og 1 Tarmregionen. 
Den laterale Fortsats paa Gjelleregionen stor, skarpt til- 
spidset, lige udadrettet, Hepaticaltornen triangular, begge 
overragende Siderne af Rygskjoldet, ovenfra seet. Pande- 
hornets Grene af Rygskjoldets halve Lrnngde, lige, stserkt 
divergerende, sylformigt tilspidsede. Prseorbitaltornen tri- 
angular, Postorbitaltornen stump; Indtnittet mellem begge 
i Bunden afrundet. 0inene meget smaa, med lyst Pigment. 
Fangarmene uden tydelige Tomer, smalt cylindriske, med 
Haanden neppe fortykket, Fingrene simple ikke forcipate, 
og kortere end Palmen. lste Par Gangfodder en halv Gang 
til saa lange som Fangarmene og ligesom de folgende Par 
simpelt cylindriske ; Endekloen forltenget med Spidsen nogen, 
hornfarvet. Hunnens Bagkrop stor og bred, nsesten cir- 
kelformig, med en stump Kjol efter Midten. Farven ens- 
formig skidden graabrun. Spandvidde indtil 250’"™. 
1 Preliminary .Report on the Crustacea dredged in the Gulf 
Stream, Part I. ■ Brachyura. 
2 “On the classification of the Majoid Crustacea” i Linnean 
Society’s Journal. Zool., Yol. XIV. 
Bay of Biscay, first drew attention to this fact, and also 
alluded to tbe form in question very closely approximating 
the crab occurring off the coast of Florida and briefly 
characterized by Stimpson 1 2 under the name of Seym uni- 
bonata. Milne Edwards suggests establishing a new genus 
for both these forms, under the aforesaid designation. 
As regards the systematic position and relation of 
this genus to the other known Oxyrhyncha, it should cer- 
tainly, from the structure of the orbita and other characters, 
be classed under the family Majidat, within the limits at 
present usually assigned to that family, — hence compara- 
tively remote alike from the genus A.mc(thui and from the 
genus Scyra, the first of which belongs to the family 
Inachidw and the latter to the family Periceridm, according 
to the revision of the Oxyrhyncha a lately published by 
E. Miers. Again, among the Majid* it unquestionably 
belongs to the sub-family Majince, and would seem to ap- 
proximate closest the genus Hyastenus, White, chiefly re- 
presented in the northern part of the Pacific Ocean. 
I. Scyramathia Carpenteri, (Norman). 
(PI. I, figs. 1—7.) 
Syn. Amathia Carpenteri, Norman, in Wyville Thomson’s : “The Depths 
of the Sea,” p. 173, fig. 35. 
Specific Character. — Body covered over the whole 
surface with a close, velvety pubescence. Carapax somewhat 
longer than broad, posteriorly arched in the middle, above 
extremely arcuate and furnished with 9 obtuse protuberan- 
ces, of which 3 belong to the gastric region, 1 to the cardiac 
region. 2 to each of the branchial regions, and 1 to the 
intestinal region. Lateral process on the branchial region 
large, very acute, and pointing straight outwards, hepatic 
spine triangular, botli projecting beyond the sides of the 
carapax when viewed from above. Branches ot the rostrum 
half the length of the carapax, straight, widely diverging, 
styliform, acuminate. Preorbital spine triangular, postorbital 
obtuse: the incision between rounded at the bottom. Eyes 
exceedingly small, with a light-coloured pigment. Chelipeds 
without distinct spines, slender cylindric, hand exhibiting 
scarcely any inspissation, dact.yli simple, not forcipate, and 
shorter than the palm. First pair of ambulatory legs half 
again the length of the chelipeds, and, like the following 
pairs, simple cylindric; terminal claw produced, with the 
point naked, and of a horny colour. In females, the abdo- 
1 Preliminary Report on tlie Crustacea dredged in the Gulf 
Stream, Part I. Brachyura. 
2 “On the classification of the Majoid Crustacea,” in the Linnean 
Society’s Journal. Zool., Yol. XIV. 
