382 Proceedings of the Royal Irish Academy. 



Kg- 



34 Scirpearia anomala n. sp. Three portions enlarged ( X 5) to show the 



difference in the nature and distribution of the polyps at different 



levels, (a) near base, (h) midway, (c) tip. 



35. Spicules of Scirpearia anomala n. sp. 



36-38. Silhouettes of the axis of colonies of S. pcctinata to show diflerent 

 angles of origin for the branches. 



39. S. pcctinata. Silhouette of axis of a colony to show the crossing of the 



branches due to contraction. 



40. S. pcctinata. Silhouette of axis of a colony to show how a secondary 



branch may take the place of a primary. 



41. Secondary development in 5, pcctinata. 



42. Portion near the liaso of a colony of S. pcctinata to show the distribution 



of the vemicae and the large canals superficially. 



43. a, b, and c. Ti-ansverse section.s of S. pulinata to show the structure 



of the coencnchyma and the disposition of the main longitudinal 

 canals, («) main .stem with numerous lai-ge canals, {h) aud (c) 

 secondar)- branch, at different levels, with only two main canals. 



44. a and h. Two views from the non-polj-p-l>earing aspect of a secondary 



branch of .s'. pcctinata Ut show the di.sposition of the polyps and 

 also their apjiearance when ]>artially exjjanded, (n) about midway, 

 (b) tip. 



45. Spicules of S. pcctinata. 



46. Colony of Scirpearia clonffata in the Museum of the Royal College of 



Surgeons, London (from a photograph supphed by Dr. Bume). 



47. Spicules of the Royal College of Surgeons specimen of Scirpearia clongaia. 



48. Spicules of the British Museum specimen of Scirpearia clongaia. 



49. Scirpearia flnrjeUum. Portion of Naples specimen enlarged (x6) to 



show the nature and distriliution of the verrucae. 



50. Spicules of Scirpearia flagcllum (Naples sjiecimen). 



51. Colony (nat. size) of Scirpearia Jlcujclhtm (Cape). 



52. Portion of colony (fig. 51) to show the nature of the verrucae. 



53. Longitudinal section through the portion of Scirpearia flagcllum shown 



in fig. 52 to show the internal structure and the attachment of the 

 strong retractor muscles. 



54. Spicules of Scirpearia flagcllum (fig. 51 specimen). 



