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Show 562 DR. R. VON LENDENFELD ON THE SYSTEMATIC [Dec. 21, B. Flesh-Spicules (Microsclera). 6. Toxius. Curved in the centre, the two ends in a straight line, thus _rXm (e.g. Toxochalina). - ft, Vosmaer. When in bundles, Toxodragmata. 7. Sigmata. S-shaped, curved irregularly, not expanded in one plane (e. g. Gel- Uodes).= t/>, Vosmaer. When in bundles, Sigmadragmata, 8. Isochela?. Curved spicules with flat expanded ends extending in the surface of a rotation ellipsoid ; both ends equal (e.g. Desmacidonidae). =-anc , Vosmaer. Anchorates, auctorum. 9. Anisochela. Curved spicules with flat expanded ends extending in the surface of a rotation ellipsoid ; ends unequal (e.g. Desmacidonidae). =anc, anc, Vosmaer. Anchorates, auctorum. 10. Diankistra. A rod with a hook at each end, divided by a remarkable incision (e. g. Vomerula). = /=*»/ Vosmaer. Bundles of hair-like spicules, Trichodragmata. 3. Triaxonia. Spicules with three axes and six rays and their derivatives. (For details compare F. E. Schulze's preliminary report.) 1. Oxyhexact. With six pointed rays, the ends of which form the corners of a double square pyramid. The rays represent tbe crystalline axes. 2. Oxypentact. One ray rudimentary, representing the axes of a simple square pyramid. 3. Oxytetract. Two rays rudimentary, representing the edges of a square pyramid. 4. Oxydiact. Four rays rudimentary, only two rays lying in one straight line remain. 5. Hexaster. A star with six, generally equal rays:- a. Oxyhexaster. Rays pointed. b. Discohexaster. Rays terminated by disks. c. Floricome. Rays terminated by a bunch of curved branches. d. Graphiohexaster. Rays much curved. Plumicome. Rays terminated with a number of plumose branches. 6. Pinnules. A star with five or six rays. One of them is particularly highly |
