288 PROCEEDINGS OF THE NATIONAL MUSEUM. vou. xxxuv. 
CQELOCLADIA SPINOSA, new species. 
Plate XVI, figs. 1-7. 
This species consists of rather straight cylindrical fragments which 
rarely exceed 10 mm. in diameter. They are calibrated, the inner 
cavity having, on well-preserved specimens, sharply defined straight 
boundaries essentially parallel to the outer circumference. The thick- 
ness of the walls varies greatly in different specimens. It is rarely 
equal to the diameter of the cloaca and is sometimes quite thin. The 
external surface is roughened by the development of great numbers 
of spiniform ostia, whose size can not well be stated because they 
taper toward the outer end. The wall structure consists of a spicular 
network which it is difficult to analyze into its individual elements. 
The spicules appear to be rather large and somewhat irregularly 
cemented one to another by the extremities of their arms. As com- 
binations of three rays diverging at approximately equal angles are 
of frequent occurrence, it is probable that the unit is a tetract. There 
seems to have been a dermal layer covering the exterior, as the outline 
of this surface against the inclosing rock is smooth (aside from the 
-ostia). The inner wall bounding the cloaca, however, is minutely 
ragged, owing to the projecting rays of the spicules. The spicular 
layer of which the walls consist 1s rather open and is pierced by the 
tubular ostia, which apparently, after passing part way. through to 
the outer side, ramify more or less, decreasing in diameter in the 
process. 
These bodies occur in lengths up to 55 mm. and more, but seldom 
show signs of branching. In some cases, however, they appear to have 
branched rather freely, and perhaps the original growth was dis- 
tinctly ramose, although at present 1t seems improbable that they 
formed extensive dendroid growths. 
Locality and horizon.—Allen limestone; cut on the Santa Fe Rail- 
road, 6 miles southwest of Chanute, Kansas. 
Ty pe-specimens.—Cat. No. 58469, U.S.N.M. 
BLA ILIOSIPOIN GAG, ENR? CEUs. 
This genus includes rather large dendroid sponges having a per- 
sistent central cloaca and a hexactinellid spicular unit. The branches 
are cylindrical, freely dividing, more or less completely coalescent 
when by chance they come into contact. The cloaca is rather small 
and apparently uninterrupted and continuous from top to bottom. 
The spicules are so oriented that their arms are rather regularly 
continuous in longitudinal and radiating lines. The third set of 
rays should make concentric lines, but although suggestions of regu- 
lar concentric structure are not wanting, it is not conspicuous in the 
thin sections seen. It is, however, a striking feature of weathered 
