301 Proceedings of the lio/jal Irish Academy. 



species. The verrucae are about 1 mm. iu height, but are not so densely 

 packed as in the tj-pe-specimen (fig. 24) ; but this may be due to its 

 immature condition. 



The colour is orange-yellow, but the verrucae are paler. 



Locality — OS" Ceylon, 34 fms. 



I^iaffnosis of J. trilintata. 



Colony upright, sparingly branched, the branches long and slender. Very 

 characteristic is the presence of three main longitudinal canals and the 

 consequent disposition of the polyps in three longitudinal groups. The 

 verrucae may show the diflereut stages characteristic of the genus. The 

 following types of spicules may be distinguished (fig. 26). 



(«) Slender clubs, with a distinct central bare portion ; the knobs on the 

 handle stand almost perpendicularly; the projections on the club-portion 

 arise at a slight angle and are directed downwards. 



0068 X 0019 length of constriction 0017. 



0-068 X 0017 „ „ 0017. 



0068 X 0019 „ „ 0015. 



(J) Clubs, similar to (n), but thicker in proportion to their length. 



0072 X 00:38 length of constriction 0018. 



0068 X 0034 „ „ 0017. 



(c) Double-stars, with verj' few large smooth warts at each end. 



0076 X 0038 constriction 0019 x 0015. 



0066 X 0042 



0015 X 0-015, 



0061 X 0034 



0015 X 0012, 



(rf) Double-wheels. 





0065 X 0034 



constriction 0-015 x 0014. 



Colour. — Dark red. 





Localifies. — Pataui, Siam. 



Off Ceylon, 34 fms. 



XIII A. — Appendix to Juncklla. 



" Inccrtae Sedis." 



Juncella santae-crucis. 



1. Juncella santae-crucis Duch. and Mich., v., p. 21, t. 2, f. 1. 



2. Juncella viminella (?), santae-crucis Gray, xii., p. 29. 



1. "Polypario stirpe simplici, rigido; axe terete, lutescente, gracili; 

 cortice cretaceo, albo ; calycibus irrcgulariter biseriatis, inaequalibus, nempe 

 nunc majoribus nunc duplo minoribus ; ore tenninali, parvo, radiato." 



