KONGL. SV. VET. AKADEMIENS HANDLINGAli. BAND. 13. NtO 3. 



19 



Explaiiation of the plates. 



Tafl. I. 



Vmbellula miniacea n. 



Fig. 1. Transverse section of thc upper part of the basal swelling of tlie pediinclc (see Tafl. II Fig. 18.#); 

 12,5 X nat. size; the object treated with diluted acetic acid. 



a. the calcareous axis, 

 a.s. the sheath of the axis, 



10. the wall of the peduncle, 



d. the dorsal cana], 

 /., 1. the lateral canals, 



v. the ventral canal, 

 c, c, c. secondary canals, 

 l.d.s., l.d.s. the lateral-dorsal septa, 

 I.V.S., l.v.s. the lateral-ventral septa, 



Fig. 2. A part of the wall, w in the preceding fig.; 125 X n. s.; the object examiued with Hartn.4Ck's eye- 

 piece 1, objective 10 imra. 



e. epithelium, 



t.hi. trausversal muscles, 



l.m. longitudinal » 



t. c. trausversal canals, with epithelium, 



l.c. longitudinal » 



c. connective tissue with radiating corpuscles. 



Fig. 3. Transverse section of the calcareous axis in the upper part of the basal swelling of the peduncle; 

 35 X n. s.; the object kept in canada-balsam. 



d. the dorsal groove, 

 L, 1. the lateral grooves, 



v. thc ventral groove, 



n. the nucleus or central raass, 



cr. a cross, consisting of connective tissue, destitute of calcareous particles, 



r.f. radial fibres (»radiäre Fäserchen» Köll.). 



Fig. 4. Longitudinal section of the same part of the axis; 300 X n. s.; the object treated with diluted acetic- 

 acid and examined with H.\rtnack's eye-piece 1, objective 7. 



Fig. 5. The base of the peduncle with the bulb, the ventral canal and thc lateral canal of the right side laid 

 open. 3 X n. s. 



b. the bulb, 



a. the basal end of the axis, curved into a hook and wrapped in the septa 



l.d.s. the lateral-dorsal septum of the right side, 



l.v.s. the lateral-ventral » » » » » , 



l'.v.s. » » o » » » left » . 



Fig. 6. Thc mouth, surrounded by the bases of the 8 expanded tentacles (lateral polype); 8,5 X n. s. 



Fig. 7. The point of a tentacle (lateral polype); 8 X n. s. 



Fig. 8. Transverse section of a lateral polype at the raiddle of its length; the object examined with H.\rtnac'K"s 

 eye-piece 1, objectives 5 — 10. 



g. the stomach, 

 d. the dorsal spheromere, 

 v. the ventral » 

 t.m. trausversal muscles. 



