102 
The Aiinrican (Jeoloyist. 
Febiiiar.v, 189S 
1882. — Holm, in Sven^ka N'et. Akad. Ilandl., vol.. vi No. 9, p. 12, plate 
1, Kgs. 13 and 14, describes and fifruies a Lower Silurian species under 
rlie name of Ampiix ixitir. 
1888. — Marr, in the Quart, .lour. (irol. Soc. London, vol. w ii. p. 724, 
fiff. 17, describes Atnpifx ( RfipJiidplnirns) (doniinsis. 
1889.— Vogdes &. Safford, in (lie Proc. Acad. Nat. Sri.. I'liihi., p. 166, 
figure and describe n Lower Siliirini) spccit's under the name of . I ;//y;//./; 
Amci'irayiun. 
RECAPITULATION. 
Skctiox 1, HuEViFitoNTES. — Glabella oval terminating in a rounded 
spine. 
Fii;. 1. Ain/ii/.r iim/'is Mikcu. 
Lower SUnridn xjin-icx: 
1. Ampyx americanus N'ogdes i*c SaHord. 
2. ■' ijruckneri Boll. 
3. '■ costatus r>oe<'k. 
4. * gratus Harrande. 
