I. Subfamily Cannobelida. Pieces of the skeleton cylindrical or spindle-shaped tangential tubules. | ||||||
| Tubules simple, smooth, | ||||||
| 658. Cannobelos. | ||||||
| Tubules spiny or branched, | ||||||
| 659. Cannorrhaphis. | ||||||
II. Subfamily Catinulida. Pieces of the skeleton hemispherical or cap-shaped, solid. | ||||||
| Caps or hemispherical pieces of the skeleton solid, with radiate margin and circular opening, | ||||||
| 660. Catinulus. | ||||||
III. Subfamily Dictyochida. Pieces of the skeleton either simple rings or pileated or pyramidal bodies, composed of thin hollow rods and reticular meshes. | ||||||
| Flinty pieces simple or arched rings, not truncated pyramids, with a basal ring, but without apical ring. | ||||||
| Basal ring simple, not arched or fenestrated, | ||||||
| 661. Mesocena. | ||||||
| Basal ring fenestrated, with two or more arches, vaulted over one side, | ||||||
| 662. Dictyocha. | ||||||
| Flinty pieces of the skeleton resembling a truncated pyramid, with an upper smaller apical ring, and a lower larger basal ring. | ||||||
| Apical ring simple, not fenestrated (one girdle of meshes on each piece), | ||||||
| 663. Distephanus. | ||||||
| Apical ring fenestrated (two girdles of meshes on each piece), | ||||||
| 664. Cannopilus. | ||||||
Subfamily 1. Cannobelida, Haeckel.
Definition.—Cannorrhaphida with numerous hollow cylindrical or spindle-shaped tubes, which lie tangentially scattered on the surface of the spherical calymma.
Genus 658. Cannobelos,[[276]] n. gen.
Definition.—Cannorrhaphida with a skeleton composed of tubular acicular pieces, which are smooth, cylindrical or spindle-shaped tangential needles, without spines and branches.
The genus Cannobelos, and the following closely allied Cannorrhaphis, represent the peculiar subfamily Cannobelida, differing from the other Cannorrhaphida in the acicular form of the pieces of the skeleton, which are tangentially scattered on the surface of the spherical calymma. The cylindrical or spindle-shaped hollow needles are smooth in Cannobelos, whilst in Cannorrhaphis they are studded with lateral spines or branches.
1. Cannobelos cavispicula, Haeckel.
Thalassoplancta cavispicula, Haeckel, 1862, Monogr. d. Radiol., p. 261, Taf. iii. figs. 10-13.
Thalassicolla cavispicula, Haeckel, 1860, Monatsber. d. k. preuss. Akad. d. Wis. Berlin, p. 798.
Cannorrhaphis cavispicula, Haeckel, 1881, Prodromus, p. 470.