THE BIUNCHING-SYSIEMS OF THE ALCYONAUE.\. -537 



EXPLANATION OF THE PLATES. 



Plate 40. 



Fig. 1. Lemnalia Jukesii. A group of lateral zooids, magniticd lo times. 



Fig. 2. Lemnalia rhabdota. A terminal branchlet, x 15. Z^, tcrniiual zooid; Z/., lateral zooid. 



Fig. 3. Lemnalia peristylu. A terminal brariehlet, x 15. Zt. and Zl. as in fig. 2. 



Fig. 4. Lemnalia nitida. An antliodetc of natural size. 



Fig. 5. A terminal branclilet of Lemnalia nitida, x 15. 



Fig. 6. Vaxi oi a.\ivs.nc\\\ei oi LeniiHilia lenninalis, x 15. 



Plate 41. 



Figs. 7, la-Id. Spicules from tiie stem and uutliocodi;e ut'L. Jukesii. 



Fig. 8. Lemnalia rhabdota. — 8 a and 8 b. Elongate fusiform spicules from the partitions between the 

 anthosteles. Sc-Se. Modified double stars from the stem-wall, S^/ being a form intermediate 

 between the spindle and the double star. 8 b magnified 145, the remainder 240 times. 

 Fig. y. Lfinnaliaperistijla. — 9 a-9 c. Fusiform spicules from the stem-partitions and branches. 9 d and 

 9e. Double stars from the stem-wall. 9c and 9d are intermediate in form between 9 a and 9 e. 

 9 a and 9 b magnified 145, the remainder 240 times. 

 I'ig. 10. Lemnalia nitida. — 10 «-10 c and 10/. Fusiform spicules from partitions and branches. 10 d, 10 e, 



and lOy-10/. Irregular spicules and double stars from the stem-wall. Note the intermediate 



forms \Qd, \0,q, 10 A. 10 </ and 10 i magnified 115, the remainder 2i0 times. 

 Fig. 11. Lemnalia terminalis. — ll«-llc. Fusiform spicules from partition- walls and branches. \\ d 



and lie. Doul)li^ stars from the stem-wall. Note the a\ial cord ax and the radial cords ra, 



in 116. Magnified 240 times. 

 Fig. 12. Scale-like spicules from the tentacles and pinnules of L. Jukesii, x 420. 

 Fig. 13. Bilobed scales from the tentacles ami pinnules of L. rhabdota, x 420. 13 « is a scale viewed 



under the polariscope. 

 Fig. 14. Vai-iously shaped spicules from the tentacles and pinnules of L. peristyla, x 420. 

 Fig. 15. Scales from the tentacles of L. nitida, X 420. 

 Fig. 10. Scales from the tentacles of L. terminalis, x 420. 

 Fig. 17. A spicule of L. rhabdota showing the a.xial core ai\, from which cords ra. radiate outward 



and emerge on the spines, x 240. 



Plate 42. 



Fig. 18. Lemnalia nitida. Terminal aiithoodiye of a branclilet which has been decalcified, stained, and 

 rendered transparent. T., Tentacles ; or., oral disc ; M., moutli ; st.', upper nou-ciliated wide 

 moiety of the stomodaium ; st." , its lower tubular ciliated part ; mes., mesenteries. 



Fig. 19. Transverse section of a branch of L. nitida, x 35. The mesoglcea is represented in grey, and 

 the mesenteries are indicated ; all other details are omitted, mm., Solenial connections 

 between chief anthosteles and lateral anthosteles ; nn., lateral anthosteles giving oft" solenia 

 from which new zooids will be formed. For the remainder of the lettering in this and the 

 next figui'e see text, pp. 531 & 532. 



SECOND SEKIES — ZOOLOGY, VOL. VII. 74 



