10 STALK-EYED CRUSTACEA. 
The name Anamathia has been substituted by Professor S. I. Smith for 
Amathia Roux, as the latter name had been previously used in another sense 
by Lamouroux. The type species of the genus is Amathia rissoana Roux 
from the Mediterranean Sea. Nine other species have been referred to the 
genus, viz.: A. hystrix Stimps., A. modesta Stimps., Scyra wnbonata Stimps., 
A. crassa A. M. Edw. (= A. agassizii Smith), A, tanneri Smith, — all from the 
east coast of North America and the Caribbean Sea, — A. carpenteri Norman 
from the coast of Europe, A. pulchra Miers from the Philippine Islands, 
A. livermorti. 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. r7ssoana, the upper surface of the 
carapace is rather flat, 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 preocular 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 preocular 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 preocular 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 
Fyastenus and Navia, In A. umbonata, A. carpentert, 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 (wnbonata and carpenteri) some of the spines of the carapace 
are transformed into flattened tubercles. For these two species A. Milne 
Kdwards * has proposed to establish a new genus Scyramathia. G. O. Sars t 
adopts the genus Scyramathia, and adds to it Amathia crassa. He places the 
genus in the Maiine group, in close proximity to Hyastenus. 
* Comptes Rendus de l’Acad. Sci., Paris, XCI. 356, 1880. 
+ Norske Nordhavs-Exped., Crustacea, I. 1, 274, 1885. 
