74 DlCTTOSPONGID^:. 



This species is of very frequent occurrence in the upper beds of this 

 foiTuation, to which it appears to be restricted. Most of the specimens 

 found have been obtained from isolated loose blocks, though Mr. E. B. Hall, 

 of Wellsville, has located a considerable colony of them near that village. 

 The species is Avell characterized and always readily recognizable by the 

 vertically elongated quadrules of the reticulum. 



DiCTYOSPONGIA LOPIIFRA, Sp. UOV. 

 Plate xv, Fig. 5. 



Sponge small, slender, long, circular in cross-section ; gradually expanding 

 for one-third of its length, thence upward nearly cylindrical. Surface smooth. 



Jietmdum composed of fine spicular bands, apparently divisible into but 

 two clearly defined series. The transverse bands are the more conspicuous, 

 and their division into primary and secondary series is clearly evident, but 

 among the vertical bands this difference is more obscure. The general aspect 

 of the surface is that of series of vertical parallelograms whose upper and 

 lower boundaries are the primary horizontal bands. A subordinate reticula- 

 tion is visible within the larger quadrules. 



The single examj)le observed of this graceful species has a length of 

 88 mm. to the base of the cup. So far it is an internal cast, but beyond this 

 point is an external cast of a spreading brush of anchoring spicules or basalia, 

 which may be traced for a distance of 33 mm., giving the specimen, which is 

 essentially entire, a total length of 121 mm. The width of the cup at its 

 upper end is 7 mm. and about the same at the middle of its length. 



Locality. In the upj)er beds of the Chemung group. Found loose at 

 Wellsville, N. Y. (Collection of E. B. Hall.) 



DiCTYOSPONGIA CHARITA, Sp, UOV. 

 Plate xv, Fig. 4. 



Sponge very small, elongate, slender and graceful ; expanding rather 

 rapidly from the base for about one-half its length, slightly contracting 

 toward or near the aperture. Transverse section circular or elliptical. Surface 

 smooth. 



Meticulum fine, with a predominance of the horizontal bands which, with 

 the vertical lines, produce a division of the surface into rectangular quadrules 

 about 3 mm. in length and 2.5 mm. in width ; these are subdivided into 

 approximate squares by two subordinate horizonal bands and one vertical 



