Nucleospira concinna

This next fossil I thought was a odd form of Rhipidomella at first but the lack of ribbing made me think otherwise. After I looked through the gallery of a friend of mine I found a picture that matched. This is Nucleospira concinna from the Hungry Hollow formation.

I like the fact that the shell has an obvious growth line on both the pedicle and brachial vales that appear to have occurred at the same time. Maybe this is indicative of an environmental change since the texture of the shell changes slightly at the border line. Here is a reference pic of Nucelospira from the Friends of the UMMP website: Click here.