100 ANTHOZOA HYDROIDA. 



a number of tubes bound together, as is easily seen on a transverse 

 section, and the oblong dorsal knobs seem to be produced by a less 

 close adhesion of the tubes at these places, " marking probably the 

 stages of growth." The branches or pinnae spring from both sides, 

 beginning about the middle of the stalk, the lower part being naked, 

 but they incline, in general, so much one way as to appear unila- 

 lateral, or secund. The wide cylindrical cells are divided from each 

 other by a joint, and are seated in the axil of a curved spinous pro- 

 cess which projects far enough to form a short tooth at the under 

 side of the aperture When dry, the stalk is twisted, and more 

 distinctly perceived to be composed of a bundle of tubes, and con- 

 sequently furrowed. In each of the furrows there is a row of small 

 holes with a raised brim, as if punctures had been made by an in- 

 strument pushed from within. The holes are close-set, and regular 

 in their size, form, and in the distances between them. No probable 

 conjecture of the use of these has yet been made. 



The Rev. D. Landsborough's Scottish specimen is eighteen inches 

 in height. " In another respect, I think the Plumularia must be 

 unusually fine. One of its general characteristics is, that its pinnse, 

 or plumules, lean so much to one side, that it has the appearance of 

 being unilateral, and, consequently, like a feather shorn on one side 

 of its rays. In this specimen, the plumules, instead of leaning to 

 one side, proceed uniformly from the stem in opposite directions ; 

 and, as the plumules on each side of the stem were upwards of an 

 inch in length, and of a silvery colour in the water, handsome 

 feathers were thus formed, fitted to vie even with those in the tail 

 of the beautiful silver pheasant." 



8. P. FRUTESCENS, stem branched, the branches pinnate ; 

 pinna alternate, bifid ; cells infundibuliform, leaning, rather 

 distant, the mouth plain. Ellis. 



PLATE XXIV. Fig. 2, 3. 



Sertularia Gorgonia, Pall. Blench. 158 S. frutescens, Ellis and Soland. Zooph, 55. 

 pi. 6, fig. a, A. and pi. 9, fig. 1, 2, encrusted with a Gorgonia. Rees, Cyclop. 

 Vermes, pi. 8, fig. 3. Turt. Brit. Faun. 214. Hogg^s Stock. 33. Aglaophenia 

 frutescens, Lamour. Cor. Flex. 173. Krauss Corall. und Zoophyt. der Sudsee, 

 26. Plumularia frutescens, Flem. Brit. Anim. 547. Lam. Anim. s. Vert. 2de 

 edit. ii. 166. Dlainv. Actinolog. 477,Hassall in Ann. and Mag. N. Hist. vii. 

 285, pi. 8, fig. 1. Couch Zooph. Cornw. 19 : Corn. Faun. iii. 37. 



Hob. Found at Scarborough, in Yorkshire, Ellis, whence I have 



