Observations on Fossil Annelids. 91 



Protoscolex simplex, n. sp. (Plate IV., fig. 4.) 



Body of medium length, slender; of nearly uniform width; divided 

 into segments, having a width equal to one third that of the body; 

 the segments are smooth, slighth' convex, and are a little wider near 

 the middle of the body than they are near the ends. 



Anterior? extremit\' sub-conical, and like the posterior end is 

 composed of a small segment of the body; the latter extremity is more 

 obtuse than the former. 



Several specimens of this species have been found, and among them 

 one found by Mi-. Dickhaut and the author, which appears to be a 

 complete individual. No markings can be seen in any of the specimens 

 by which the anterior and posterior extremities could be positivel}'^ 

 determined. 



It would be difficult to confound this species with any of the others 

 herein described; it is distinguished from P. covingtonensis, which 

 it resembles mostly, b}' the greater length, much more narrow, and 

 convex segments in that species. 



Locality and position. — Same as the last. 



Associated with the above described forms were, what can scarcely 

 be considered otherwise than the setae of marine worms. They were 

 found in considerable numbers, and well preserA'ed, while of the ani- 

 mals to which they belonged not another trace was observed. It is 

 probable that they belonged to several species, but I will class them 

 under one name, since the differences observed in different specimens 

 are not sufficient for satisfactory determination. 



I propose for the specimens the name 



EoTROPHONiA SETiGERA, u. gcu. et sp. (Plate IV., fig. 5.) 



The animal was provided with three series of tufts of setse, one 

 probabh" on the back, and one on each side. A single tuft on each side 

 very likel}', was situated at the junction of each segment, as in Tro~ 

 phonia. Each segment appears to have been about one line wide, since 

 the setae tufts are placed at that distance apart. 



The tufts are composed of from twenty to forty or more hairs, all 

 directed obliqueh' outwards, and, if the direction was the same as in 

 the existing species, Trojphonia affinis, forwards. The setae are about 

 two lines in length, and the two side series are from three fourths of a 

 line to one line apart. 



The length of the entire animal is unknown. 



