58 Proceedings of the Royal Irish Academy. 



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

 packed as in the tjpe-speeimen (fig. 2-i) ; but this may be due to its 

 immature condition. 



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



Locality — Off Ceylon, 34 fms. 



Diagnosis of J. trilineata. 



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 different stages characteristic of the genus. The 

 following types of spicules may be distinguished fig. 26,. 



{n) 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. 



0-068 X 0-019 length of constriction 0-017. 

 0-068 X 0-017 „ „ 0-017. 



0-068 X 0-019 „ „ 0-015. 



{h) Clubs, similar to (a), but thicker in proportion to their length. 

 0-072 X 0-038 length of constriction 0-018. 

 0-068 X 0-034 „ „ 0-017. 



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

 0-076 X 0-038 constriction 0019 x 0-015. 



XIII A. — Appendix to Juncella. 



" Incertae Sedis." 



Juncella santae-crucis. 



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



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



J. "Polypario stirpe simplici, rigid o ; axe terete, lutescente, gracili; 

 cortice cretaceo, albo ; calj'cibus irregulariter biseriatis, inaequalibus, nempe 

 nunc majoribus nunc duple minoribus ; ore terminali, parvo, radiato." 



