

10 



STALK-EYED CRUSTACEA. 



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The name Anamathia has been substituted by Professor S. I. Smith for 

 Amalhia Roux^ as the latter name had been previously used in another sense 

 by Lamouroux. The type species of the genus is Amalhia rissoana Eoux 

 from the Mediterranean Sea. Nine other species have been referred to the 

 genus, viz. : A. hystrix Stimps., A. modesta Stimps,, Sc^/ra itmhonata Stimps., 

 A. crassa A, M. p]dw. {= A. agassidi Smith), J. tameri Smith, — all from the 

 east coast of North America and the Caribbean Sea, — A oarpenteri Norman 

 from the coast of Europe, A. pidchra Miers from the Philippine Islands, 

 A, Kvermorii W.-M. from the Bay of Bengal, and A, occidentalis Fax. from 

 near the Galapagos Archipelago. Most of them have been taken in rather 

 deep water (88 to 561 fathoms). When all these species are compared with 

 each other, considerable differences are observable as regards the structure 

 of the orbital region, the armature of the basal antennal segment and the 

 carapace, etc. In the typical species, A. rissoana^ the upper surface of the 

 carapace is rather Hat, and armed with long, sharp spines ; the basal anten- 

 nal segment is unarmed; the upper margin of the orbit projects but slightly 

 over the eye, and there is no pra)ocular spine. In A. hystrix the carapace 

 is more convex both in the longitudinal and transverse axes, and is armed 

 with very long sharp spines; the basal antennal segment is produced into 

 a blunt spine or tooth at its antero-external angle ; the supraorbital margin 

 or brow overhangs the orbit no more than it does in A rissoana^ but there is 

 a long and sharp pra^ocular spine. In A. crassa the carapace is strongly 

 arched, and the spines with which it is furnished are short ; the basal seg- 

 ment of the antenna is armed with two spines, one at the distal, the other 

 near the proximal end; there is a proiocular spine, and the upper border 

 of the orbit beetles further over the eye than it does in A. rissoana and 

 A, hystrix^ but still falls short of forming that perfect roof bounded behind 

 by an almost transverse fissure, such as is seen in the typical species of 

 Ilyastemts and Naxia. In A. timhonaia, A. carpenteri, and A. occidentalis, the 

 conformation of the orbits and the convexity of the carapace are much the 

 same as in A. crassa^ but the basal joint of the antenna is unarmed, and in 

 the two former {imibonata and carpcnteri) some of the spines of the carapace 

 are transformed into flattened tubercles. For these two species A. Milne 

 Edwards* has proposed to establish a new genus Scyramathia, G, O. Sarsf 

 adopts the genus Scyrarnathia^ and adds to it Amatlda crassa. He places the 

 genus in the Maiine group, in close proximity to Ilyastcniis. 



* Comptes Rendus de I'Acad. Sci., Paris, XCX. 356, 1880. 

 f Norske Nordhavs-Exped., Crustacea, I. 1, 374, 1885. 



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