HYDROZOA — RITCHIE. 837 



Bedot^'^ and P. chazaliei by Clarke"^ seem to me to indicate 

 P. Jilicula, while the original P. chazaliei as described by 

 Versluys-^ resembles, on the other hand, Allman's P.pectinata. 

 Localities. — Station 57, off" Wata Mooli, three and a half to 

 four miles from shore ; depth, 59 to 54 fathoms ; bottom, mud ; 

 22nd March, 1898. 



Family SERTULAKID^. 



SERTULARELLA ADPRESSA.^o sp. nov. 



(Plate Ixxxv., fig 6; Plate Ixxxviii., figs. 1, 2, and 9.) 



Stations 36 and 54. 



From each of two Stations comes a single example of this 

 species. That from Station 54 is the larger and more mature 

 colony and its growth is more complex. 



Trophosome. — The habit of the colony is striking. The stems, 

 stout (up to 3 mm. in diameter), and strongly fascicled, spring 

 from a clump of hydrorhizal tubes, and bear irregularly arranged, 

 long, fascicled branches, the fiist of which may arise quite near 

 the base of the colony. The branches reach a length of 6 cms., 

 and bear branches, which again carry branches, and these again, 

 to the fourth degree. Stem and branches are furnished with 

 regularly arranged, alternate pinnae, up to 18 mm. in length, 

 although the general size is about 10 mm. Two pinnse on the 

 same side are separated by slightly under 3 mm. Branches and 

 pinnse lie in one plane, and so frequent is anastomosis between 

 branch and stem, and pinna and branch, that a colony may be 

 bound into a flabelliform mass, and even two or more colonies 

 may become inseparably united. Formed in this way, the 

 largest specimen before me forms an expanse 10 cm. high by 

 9 cm. broad. 



Where it is free from fascicle tubes, the stem can be seen to be 

 divided into regular internodes separated by oblique nodes which 

 slope .successively in opposite directions. Each internode bears 

 three hydrothecae, following each other in a close succession, 

 which is seldom interrupted by nodes. Indeed, in the majority 

 of the pinnae, there is no trace of division into internodes. 



■•''^Pictet and Bedot— Res. Camp. Sci. Monaco, fasc. xviii., 1900, p. 18, 

 pi. iv. , figs, l-t, pi. V. 



«8 Clarke — Mem. Mus. Comp. Zool. Harvard, xxxv., 1, 1907, p. 15, 

 pis. 11-13. 



»9 Versluys— Mem. Soc. Zool. France, lii., 1899, p. 32, figs. 2-4. 



30 dd^ and premo, to press, signifying the adpressed condition of the 

 gonangium. 



Y Y 



