[ 247 ] 



VII. 



A REVISION OF THE GORGONELLIDAE : 1. THE JUNCELLID 



GEOUP. 



By JAMES J. SIMPSON, M.A., B.Sc, 

 Carnegie Research Fellow, Zoological Department, University of Aberdeen. 



Plates I-XIX. 



[Reail Febiiuauy 28. Ordered for Publication Mahch 2. Published Ai'Ocst 19, 1910.] 



CONTENTS. 



PAOP. 



, Scirpenria emend., . . . 307 



(ff) Discussion of the 



genus, . . . 307 



(4) Classification of the 



species, . . . 309 

 Scirpearia profunda emend., . 312 

 Scirpearia hicksoni, . . 314 



Scirpearia verrucosa, . . 316 

 Scirpearia anomala, . .317 

 Scirpearia pectinata emend., . 319 

 Scirpearia elongatn emend., . 32.5 

 Scirpearia flagellum emend., . 328 

 Scirpearia thomsoni . . 333 

 Scirpearia alba . . . 334 

 Scirpearia aurantiaca emend., . 336 

 Scirpearia furcata emend., . 3"9 

 Scirpearia andamanensis . . 3.52 

 Scii-pearia ramosa . . . 354 

 Scirpearia ceylonensis . . SUn 

 Scirpearia maculata . . 357 



Scirpearia quadrilineata. . 358 



Nicella emend., . . . 360 



(n) Discussion of the 



genus . . . SCO 



(i) Classification of the 

 species with amended 

 dignoses, . . 362 



Nicella dichotoma emend, . 363 

 Nicella Habellata emend., . 365 



Nicella relicul.ata . . . 366 

 Nicella nioniliforme, . . 368 

 Bathymetrical distribution, . 369 

 Geographical distribution, . 371 

 Bibliography, . . . 376 



I. — Introduction. 



Systematic description of Alcyonarians is beset with many difficulties, 

 sometime.? duo to (uir iniiorancp of intimate struclure — as in the case of the 



R.I. A. I'liOC, VCIJ,. X.WIII., SECT, li, [2 LJ 



I. 



Introduction, . . . . 



247 



XIV. 



II. 



Material examined, 



249 





III. 



Biological note, . . . . 



251 





IV. 



Historii al summary of the group. 



253 





V. 



Macroscopic and microscopic char- 









acters .as a basis of classification. 



259 



XV. 





(1) Coenenchyma, 



259 



XVI. 





(rt) Surface, thickness. 





XVII. 





and consistency. 





XVIII. 





(b) Histology. 





XIX. 





(c) Colour. 





XX. 





(2) Canal systems. 



261 



XXI. 

 XXII. 

 XXIII. 





(3) Polyps, . . . . 



264 





(n) Structure. 





XXIV. 





(J) Motility. 





XXV. 





(c) Retraction. 





XXVI. 





(rf) Distribution. 





XXVII. 





(4) Axis 



269 



XXVIII. 





(5) Spicules, . . 



269 



XXIX. 



VI 



Possible affinities of theGorgonell- 





XXX. 





idae 



272 



XXXI. 



VII. 



Division of the Gorgonellidae into 









genera, 



275 





VIII. 



Emended diagnoses of the family 









and genera 



279 





IX. 



Juncella emend. Classification of 









the species, . . . . 



281 



XXXII. 



X. 



Juncella juncea emend., 



284 



XXXIII. 



XI. 



Juncella gemmacea emend.. 



294 



XXXIV. 



XII. 



Juncella racemosa emend., . 



300 



XXXV. 



XIII. 



Juncella trilineata, 



303 



XXXVI. 



Xlllrt. 



Appendix to Juncella (Incertae 





XXXVII. 





sedis), 



304 





