Expedition i Biscayerbugten gjort opmærksom herpaa^og 



tillige paapeget, at den lier omhandlede Form slutter sig 

 meget nær til den af Stimpson 1 under Benævnelsen Scyra 

 umbonata kortelig characteriserede Krabbe fra Havet om 

 Florida. Milne Edwards foreslaar at oprette for begge disse 

 Former en n\ Slægt under ovenstaaende Navn. 



Angaaende denne Slægts systematiske Stilling og For- 

 hold til de ovrige bekjendte Oxyrhyncher, synes det efter 

 Øienhulernes Bygning og andre Characterer klart, at den 

 maa henføres til Familien Majidæ, i den Begrændsning 

 hvori denne Familie for Tiden ialmindelighed opfattes, alt- 

 saa temmelig fjernt saavel fra Slægten Amathia som fra 

 Scyra, hvqraf den første tilhører Familien Inachidæ, og den 

 sidste Familien Periceridæ. ifølge den nylig af E. Miers givne 

 Revision af Oocyrhyncherne. 2 Blandt Majiderne igjen til- 

 hører den utvivlsomt Underfamilien Majinæ og slutter sig, 

 som det synes, nærmest til Slægten Hyastenus White, bris 

 Arter væsentlig stammer fra den nordlige Del af det stille 

 Ocean. 



• I. Scyramathia Carpenteri, (Norman). 



(Pl. I, Fig. 1-7). 



Syn: Amathia Carpenteri, Norman, i Wyville Thomson's: "The Depths 

 of the Sea", pg. IT."', Fig. 35. 



Artseharaeteristic. Legemet overalt tæt og kort 

 laaddent. Rygskjoldet noget længere end bredt, bagtil i 

 Midten udbuet, oventil stærkt hvælvet samt forsynet med 

 9 stumpe Forboininger. bvoraf de 3 tilhører Maveregionen, 

 1 Hjerteregionen, 2 hver Gjelleregion og 1 Tarmregionen. 

 Den laterale Fortsats paa Grjelleregionen stor. skarpt til- 

 spidset, lige udadrettet. Hepaticaltornen triangulær, begge 

 overragende Sider ne af Rygskjoldet, ovenfra seet. Pande- 

 hornets Grene af Rygskjoldets halve Længde, lige, stærkt 

 divergerende, sylformigt tilspidsede. Præorbitaltornen tri- 

 angulær, Postorbitaltornen stump; Indtuittet mellem begge 

 i Bunden afrundet. Øinene meget smaa, med lyst Pigment. 

 Fangarmene uden tydelige Torner, smalt cylindriske, med 

 Haanden neppe fortykket. Fingrene simple ikke forcipate, 

 og kortere end Palmen. Iste Par Grangfodder en halv Gang 

 til saa lange som Fangarmene og ligesom de følgende Par 

 simpelt cylindriske : Endekloen forlænget med Spidsen nøgen, 

 hornfarvet. Hunnens Bagkrop stor og bred. næsten cir- 

 kelformig. med en stump Kjøl efter Midten. Farven ens- 

 formig skidden graabrun. Spandvidde indtil 250 mra . 



1 Preliminary Report on the Crustacea dredged in the (rult' 

 nu. Part I. Brachyura. 



"On the classification of the Majoid Crustacea" i Linnean 

 3i '" i ■ Journal Zool., Vol. XI\". 



Bay of Biscay. first drew attention to this fact. and also 

 alluded to the form in question very closely approximating 

 the crab occurring off the coast of Florida and briefly 

 characterized by Stimpson 1 under the name of Scyra um- 

 bonata. Milne Edwards suggests establisbing a new genus 

 for both these forms, under the aforesaid designation. 



As regards the systematic position and relation of 

 this genus to the otber known Oxyrhyncha, it should cer- 

 tainly, from the structure of the orbita and other characters. 

 be .classed under the family Majidæ, within the limits at 

 present usually assigned to that family. — hence compara- 

 tively remote alike from the genus Amathia and from the 

 genus Scyra, the first of which belongs to the family 

 Inachidæ and the latter to the family Periceridæ, according, 

 to the revision of the Oxyrhyncha- lately published by 

 E. Miers. Again. among the Majidæ it unquestionably 

 belongs to the sub-family Majinæ, and vould seem to ap- 

 proximate closest the genus Hyastenus, White, cbiefly re- 

 presented in the northern part of the Pacific Ocean. 



I. Scyramathia Carpenteri, (Norman). 



(Pl. I. figs. 1—7.) 



Syn. Amathia Carpenteri, Norman, in Wyville Thomson's: 

 of the Sea," p. 175, fig. :>.">. 



■The Depths 



Specific Charaeter. — Body covered over the whole 

 surface with a close, velvety pubescence. Carapax somewhat 

 longer than broad, posteriorly arcbed in the middle. above 

 extremely arcuate and furnished with i» 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, aud pointing straight outwards. hepatic 

 spine triangular, both projecting beyond the sides of the 

 carapax when viewed from above. Branches of 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. Eves 

 exceedingly small, with a ligbt-coloured pigment. Cbelipeds 

 without distinct spines, slender cylindric. band exhibiting 

 scarcely any inspissation, dactyli simple, not forcipate, and 

 shorter than the pa.lm. 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 the Crustacea dredged in the Gulf 

 Stream, Part I. Brachyura. 



■' -(in tlir classification of the Majoid Crustacea," in the Linnean 

 Society's Journal. Zool.. Vol. XIV. 



