22 



Erivin H. Barbour, 



One very peculiar form which I shall leave unnamed, and 

 but briefly mentioned, awaiting further study, is shown in 

 Plate VI., of which Figs. 33, 34 show enlarged views of the 

 processes of such forms. 



In Fig. 33 there is a certain parallelism associated with a 

 crossing and intertwining of the tubes, suggestive of the sili- 



cious framework of a 

 Venus Flower -basket 

 on a large scale. The 

 wrinkled surface of Fig. 

 34, quite commonly met 

 with, has a sponge-like 

 look, as has the whole 

 specimen. Aside from 

 this superficial appear- 

 ance there is no evi- 

 dence that these are 

 sponges, as I have sus- 

 pected them to be. The 

 structure of this genus 

 is identically that of the Daimonelix. This specimen. Fig. 

 32, stands as it did in the quarry. As to size, they are about 

 two to three feet long, and three inches in diameter. 



-5Jn 



Fig. 18. — Cross section of Daimonelix carinata, 

 near the bottom. (See last section, Fig. 24, 

 Plate IV.) 



In my collection there are six or eight individuals of .a 

 form akin to the above, but not sufficiently worked out for 

 more than a mere notice. They coil about and branch ir- 

 regularly, maintaining in all cases a certain perpendicularity. 

 They are about one-half to three-fourths of an inch in diame- 

 ter, and one to two feet or more in length. The structure of 

 this species is represented fairly well by that of Fig. 33, 

 Plate VI. 



322 



