What is Growing on this Devonian Brachiopod?

The following pictures are of a Middle Devonian Period brachiopod Mucrospirifer? found in Clark County, Indiana. It was found in Sellersburg (North Vernon) Limestone. What I am not sure about is little line segments creeping up the valve. Is it some sort of coral or algae?

This brachiopod will be cleaned next time I am at the workshop. It should hopefully reveal more details on this brachiopod.

UPDATE (05/26/2010): I think I figured out what this is.  After reviewing a KYANA Geological Society website Devonian Fossil section for an identification of a bryozoan growing on a horn coral I found pictures of the Hederella sp encrusting an Orthospirifer fornacula. It too is found in the North Vernon Formation of Clark County, Indiana of the Middle Devonian Period.  Thanks to Alan G. for providing the original images for the KYANA post!

Learn more about hederellids or hederelloids on Wikipedia.

Unidentified Devonian Brachiopod

Look at the curves on this brachiopod. :) This unidentified brachiopod was found in the Jeffersonville Limestone which represents the Devonian Period rock. Found in Louisville, Kentucky USA.









UPDATED: This brachiopod appears to be a Brevispirifer gregarius (Clapp, 1857).

Unidentified Silurian Brachiopod

The following are pictures of an unidentified brachiopod from the Silurian Period. It was found in Louisville Kentucky in the Louisville Limestone layer.

I do not see a match for it in the Fossils of Ohio book.

Look at all the sinusoidal lines spaced on top of each other is this next picture.