Spectks of the Biiulinoton Grottp. 165 



*' Surface cancellate by strong concentric and vertical striae ; the inter- 

 mediate spaces finely reticulate by filiform striae, which cross each other 

 rectangularly. The body presents prominences or protuberances, which are 

 not sufficiently elevated to be termed nodes. 



" A large imperfect specimen, which is distorted by compression, has a 

 length of 180 mm. and a width of about 93 mm. 



" The specimens of this species are all more or less distorted ; they appear 

 as broad funnel-shaped expansions without evidence of a distinct tubular base, 

 and are usually fragmentary ". 



The foregoing is the original description of these fossils, founded upon 

 very imperfect material. Upon re-examination of these specimens and compari- 

 son with the more completely known species from the Waverly group of 

 Pennsylvania we are disposed to conclude that all are fragments of CalatJio- 

 spongia Medfieldi or its close ally, O. Oarlli. It has already been observed that 

 the cups of these species were very delicate and fragile, easily liable to dis- 

 tortion and fracture ; and there are none of the specimens upon which the 

 description of Ectenodictya implexa was based which do not show the charac- 

 teristic expression of the reticulum produced by the predominance of the hori- 

 zontal spicular bands. The specimen from which the original illustration wae 

 drawn, is the apertural portion of a large cup somewhat infolded at the mar- 

 gin. It was incorrectly oriented in the drawing ; the right margin represents 

 the apertural edge. 



Localities. The specimens have been found in the Waverly group at 

 Warren, Pennsylvania, in association with Syringotliyris RandalU, and in the 

 same formation at Oil City, in that state. 



SPECIES OF THE BURLINGTON GROUP. 



LYKODICTYA, Hall. 

 (For description see page 170.) 



LyEODIOTTA (?) BURLINOTONENSIS, Hall (sp.). 

 Plate liii, Via. 6. 



1884. Ectenodictya BurlingUynensis, Hall. Thirty-fifth Ann. Kept. N. Y, 

 State Mus. Nat. Hist., p. 476. 



The single specimen representing the only species of Dictyosponge yet 

 found in this formation, consists of a quite imperfect outer impression of a cyath- 

 iform frond, having a smooth exterior and showing a strong development 



