FOURTH REPORT OF THE DIRECTOR I907 1 69 



Clionolithes palmatus, a singular form assuming 

 broad sparsely branched palmate hollow fronds and found only in 

 the pelecypods and gastropods of the Portage group (Upper De- 

 vonic) . 



Among these boring bodies is another, which judging only from 

 the form of its tubes must have been very unlike the rest. I have 

 observed it only in the brachiopods of the Coblentzian sandstone 

 and in order to express its notable difference from the other borings 

 mentioned shall designate itasCaulostrepsis taeniola. 

 In these the borers began at the edge of the shell and the casts of 

 their borings are long, narrow tapelike tongues with an elevated 

 edge all the way around. This corded edge is a continuous tube 

 while the area between is a narrow fiat space connecting the tubes 

 of the loop. I hesitate to assign this curious form to the sponges; 

 it has in miniature a resemblance to some of the worm casts found 

 on the surface of old rocks, but the evident open connexion between 

 the tubes of the loop makes it difficult to allot to this boring its 

 probable maker. 



Boring pelecypods were not unknown in the early Paleozoic. 

 Instances are rare indeed but a very striking example is the small 

 Modiomorphalike shell Corallidomus concentricus 

 described by Whitfield from the Cincinnati shales of Ohio [see Geol. 

 Ohio. 1893. 7- 493' pl- ^3]- "^^^ figure given by this author shows a 

 colony of the coral Labechia ohioensis Nicholson per- 

 forated by scores of burrows in some of which the shell itself is 

 found. Such occuirences have been freely described in Mesozoic 

 faunas and boring insects in the woods of the Tertiary. 



