37 



slightly pointed on the outer, and waved on the lateral 

 margins. 



Ellis states that his specimen had no ovarian vesicle and 

 that he had never seen any ; Johnston, Lamouroux and all 

 other authorities to whom I have access do not mention 

 them, aud the specimens I have are without any, so that at 

 present they appear to be unknown.* 



SHRUBBY CORALLINE. Plumularia Frutescens. Stem 

 dark brown, composed of sub-parallel tubes irregularly 

 branched, branches pinnate, pinnae alternate, bifid ; cells 

 distant, ovato-tubular with plain and slightly everted rims; 

 vesicles ovoid, smooth, with small terminal apertures. 



Sertularia frutescens, Ellis and Solander's Zooph., p. 55, 

 pi. G, fig. a A, pi. 9, figs. 1, 2, covered by an Alcyonium. 

 Turton's Lin,, vol. 4, p. 680. Stewart's Elem., vol. 2, p. 445. 

 Plum, frutescens, Fleming's' Brit. An., p. 547. Johnston's 

 Brit. Zooph., p. 149, pi. 20, figs. 2, 3. Aglaophenia fru- 

 tescens, Lamouroux's Cor. Flex., p. 173. 



Hab. On stones from deep water, from the Eddystone to 

 the Dead man. Common, but not abundant. 



This species is of a dark brown colour and varies from one 

 to five inches in height. The stem is composed of aggregated 

 sub-parallel tubes of a dusky brown colour, and not polished. 

 The pinnae are closely arranged, formed of single tubes and 

 bifurcated, with one cell on each inlernode. The cells much 

 resemble old fashioned coffee cups, with patulous apertures 

 having slightly everted rims. They lie close to the pinnae, 

 and are lodged in a slight cavity of the internode, with a 

 transparent triangular denticle between each. Sometimes 

 they are much branched and bushy, but most commonly are 

 only a simple frond. The vesicles are numerously produced 

 in March and April, on the upper edges of the pinnae. They 

 are small, ovoid, with prolonged terminal apertures. 



LAO MEDEA. Lamouroux. 

 Generic Character: Polypidom rooted by a creeping fibre, 

 plant-like, erect; jointed at regular intervals, the joints 

 ringed, incrassated, giving origin, alternately on opposite 

 sides, to the shortly pedicled cells; cells campanuiate; 

 vesicles axillary. Polypes hydraform. 



SEA THREAD CORALLINE. L. Dichoioma. Stem 

 filiform, branched dichotomously ; cells alternate campa- 

 nuiate, the rim even. 



* The vesicles of this species have since been seen by the Rev. 

 D. Lunsborougb of Ayrshire, he says " they are as remarkable as those 

 of P. Cristata," but does not describe them. Zoologist, vol, 1, p. 88. 



E 



