124 



Fig. 5. 



Amtlkxcs HAMILTO.NLE. Hilll. 



(Fio-. 5.) (111. Dev. Foss.. PI. 

 XIX.) 



Distill^ uishing L 'harnctcrs. — Eh m- 

 uated cvlindrical. gently tapering- 

 form, often al)rn|)tly bent at the 

 base; strongly wrinkled e[)itheca; 

 eoniparativt^y slight development 



„. Amplexiis hamiltonicn. 



Front and side view of a specimen ()t S(:'])ta: \V(.'ll-( leveloi )e(l tiUjnue. 

 from Morse Creek, showing irregular ' 



form diseontimious septa and cen- j^jent do^^■n near the thin wall. 



ti'al tabiufe. The center of tlie 



PaL Voii^'Hm-v. uuh-74t'.'^No* 2^^^^^ Fonnd freqnently in the Moscow 

 ""■'^'°^'* shale, three to hve feet above its 



base, between Seetions 4 and .">. and at Morse Ci*eek. 



AmI'LEXI'S (?) IXTKKMITTKNS.* Hall. ( Fig. (). ) (111. Dev. 



Foss., PI. XXXII., Figs. 8-18.) 



DistinguishiDg Characters. — Small size; irreg- 

 ular form, varying from cylindrical, with snd- 

 dcn expansions, to regnlarly conical ontline; 

 well-developed septa, which reach to the center, 

 and freqnently unite before reaching it. 



Fonnd in the lower Moscow shale, between 

 Sections 4 and 5. It is comparatively rare. 



Fig. C. .-Im- 

 plexus (.?) (Ji- 

 ff CHi itiens (af- 

 ter Hall). 



Gexts HELIOPHYLLr:\I. Hall. 



[Ety. : Helios, sun : plti/Uon, leaf.] 

 ( Dana's Zoophytes, 1848, p. 356.) 



Simple or compound, the individuals conical, or turbinate, 

 \vith shallow calyx, and surrounded by a thin e})itlieea. 

 Sejita alternating in length, the longer extending to the 

 center, all sn])plied with sup})orting lamellae, which curve 

 from the periphery upwards and inwards, so as to describe 

 ci convex upward-curve, and appear in the calyx as cross- 

 bars or carina\ 



Heliophvllu-M ualei; E. and H. (Fig. 7.) (111. Dev. 

 Foss., PI. XX I II.) 



* This species is probably not an Amplexus, nor does it seem to belong to any described 

 genus. 



