118 liev. Canon Norman — A Munth on 



(PI. VII. fig. 1). — Zooecia much more delicate in structure than 

 in the last variety, semierect, so that in most cases the punctate 

 crust is to be seen not only on the hinder portion, but on the sides 

 beneath the area ; lateral spines mostly four, but sometimes 

 six or eight; posterior seta of moderate lengtli, equal to about 

 two zooecia. The zooecia are more irregularly disposed than 

 in any other variety, often one series is developed on the top 

 of another, and here and there at the extremity of the branches 

 they take on a verticillate arrangement ; but this verticillate 

 arrangement is rarely to be found, and I regard it in my 

 specimens as purely accidental ; but the tendency of the 

 zooecia to erect themselves, and hence their form, and the four 

 lateral spines clearly indicate this as the form described by 

 Lamouroux. I have a large quantity of this variety clothing 

 in every part masses of a small round branched weed about 

 3^ inches high. It is part of that portion of my British col- 

 lection which was Barlee's, but the locality has not been 

 preserved. (Lamouroux, Expos, nieth. Polypiers, pi. iv. 

 figs, a, A ; Moll, Eschara^ ex Zooph. ord. genus 1803, pi. iv. 

 fig. 6, A-E.*) 



Var. 5. Jnppothoiform{s, = vaY. laxa (Pl.VI. fig. 7), Hincks's 

 names for Smitt's pi. xx. fig. 49. — In this beautiful and most 

 remarkable variety the zoarium consists of lines composed of a 

 single series of zooecia, whence branches diverge right and left 

 from every cell (normally) f ; these branches also consist of 

 cells in single file and give origin to other pinnulje, thus in 

 all respects conforming to the , habit of Hijjpot/ioa divaricata. 

 It runs over Fuel and is most fully and perfectly developed 

 on their air-bladders. The following is the description of the 

 arrangement of the zooecia in a portion of a specimen : — A 

 main branch consists of a chain of 34 cells, the first twenty- 

 five of which give origin, both on right and left, to branches, 

 the structure thus being elegantly pinnate. We will now 

 follow the course of three consecutive pimire on the left side. 

 Piniui A X 1-5, 6 (1), 7 (1), 8-12, 13-31 (1) ; from 13 to 31 



* Moll's specimeu had six lateral i^piuos ou the colls ; that of Lamouroux 

 four. 



t To understaud how this takes place, see Jules Barrois, 'Mt?m. sur 

 rembryol. des Drvozoaires,' 1877, pi. xv. tig. (i, ^Yhore we have roprci^ented 

 the " mother-cell " giving oil' the conimencemeut of the three next cells, 

 cue iu frout and one fioni each siioulder. Kach coll iu var. hippothi)!- 

 formis in this respect acts as the " mother-cell," jrivinir oft" tiiree buds, 

 but the lateral, instead of beiuir diiecled forwards, are directed outwards. 



I A number as the lirst " 1-5 " means that the lirst live cells of the 

 pinna have no branches, " (1) " meaus that the sixth gives origiu to a 

 branch (pinnnhi) on one .side, " 7 {'2) " would meau thut the cell gives 

 rise to two piimida^ riglit and left. 



