Critters of 16/4/10

tesFor today I have gone for more trilobites, both of which are agnostids. Most agnostid trilobites are eyeless and have a similar sized pygidium as the cephalon, making it difficult to determine which end is which sometimes.

This first agnostid trilobite is Lotagnostus which is from the Upper Cambrian. Lotagnostus trisectus can be found near the Malvern Hills. It is sometimes known as Agnostus trisectus. 

This agnostid trilobite is Eodiscus punctatus, from the Middle Cambrian. It can be found in Wales and is sometimes referred to as Microdiscus punctatus.