100 The AnuriViin Ueolog'ixt. February, 1893 
must be considered rather generic than speciiic distinctions. As the 
terms nasntii)^ and r(jstr(((iii< are therel'ore inappropriate as specific 
designations, they should be replaced by others not tending to con- 
found generic with specific characters, and Ampy.r nasutus might be 
called after its discoverer Ampyx dahnani, and Ampi/x rostratus, Ampyx 
snrsii." The author expresses a doubt if all the figures of Ampy.r nunn- 
milldtiis given by Sars are one and the same species. He describes and 
illustrates Ampyx austiiii which has hitherto been regarded as a 
synonym of the older species, Amjiyx mammilhttux. Ampyx bacatus 
Portlock is prol)ably the head of a species of the genus Encriminurus ; 
it is indistinctly illustrated. 
1846. — Barrande describes in his preliminary work, Nouv. Trilob. 
p. 9, Ampyx poi-tJocki, which has five segments in the thorax. 
Corda describes and figures under the name of Ampyx bohemlcuK, a 
species to which Barrande had already given the name of Anipyx 
porthckli. Prodrom, 1847, p. 154, pi. 3, fig. 19. 
1847.— Boll, in Dunk tt Meyer's Paheont. Bd 1, Liefg. 2, pi. 17, fig. 8, 
describes and figures Ampyx hnirkiwrl, a new species from an erratic 
boulder. 
1848. — Forbes describes and illustrates in the Mem. Geol. Sur., vol. 
2, part 1, page 350, a new species from the Upper Silurian of Ludlow, 
England, under the name of Ampyx /xa- ruins, which he figures on plate 
10 ; it has only 5 thorax segments. 
1849. — Forbes, in the Mem. Geol. Sur. Decade II, plate 10, describes 
and illustrates Ampyx nndiis, a species which Murchison had classed 
under the genus Trinucleus, in his Silurian Syst. 1839, p. 660. Forbes 
divides the genus into two provisional sections as follows: 
1. Ampyx proper with the head long and five thorax segments. 
2. Brachampyx with the head short and round with six thorax seg- 
ments. 
The section Brachampyx is equivalent to Dalman's original genus 
Amjiyx, of which Ampyx naatitxs is the type, and is altogether mis- 
applied; it should be abandoned. 
1850. — McCoy, in Annals Mag. Nat. His., series 2, vol. 4, p. 410, gives 
a classification of English trilobites. He enumerates the genus Ampyx 
under the ( )gygid;i'. The author also describes a new species under the 
name of Ampyx luinx, with five thorax segments; cf. Ampyx niidns 
which occurs near Builth, Wales, the locality given for this fossil. 
1854. — Angelin, Palii'ontologia Scandinavica, p. 80, proposed the fol- 
lowing subdivisions of the genus Ampyx. RapJtiopJnirldn- with three 
genera. 
1. Lonchodomus Aug., with lancelate glabella terminating in an 
elongated prismatic spine; type Ampyx rostrdtiis Sars. 
2. Ampyx Dalm., with an oval glabella terminating in a rounded 
spine, six thorax segments; type Ampyx rostafnx Boeck. 
3. Uaphiuphorus Aug., with an obovate glabella having an abrupt 
apical spine, five thorax segments ; type .1. scterostrls Ang. 
The author describes and illustrates Ampyx c(>t<tati(s Boeck taking 
Sars' figure of Ampy.r inammilhttns. Isis 1835, plate 8, figs. 4a-b and d 
