406 TUBULARIA LARYNX. 



single stem, with its li^-dranth and gonophores, exists in the Miiseuiu of the Jardin des Plantes.^ 

 This sjjecimen, so far as I know, is unique, but it has been fortunately preserved in spirits, so that 

 some of its most important characters are determinable. It is desirable, however, that we know 

 more of this fine species than what can be satisfactorily made out from the preserved specimen, and 

 we must still wait for an opportunity of inspecting other examples, more especially living ones. 

 I have not been able to determine anything regarding its development, nor, indeed, even the sex 

 of the specimen, for though this was with great liberality placed at my disposal, I did not feel 

 justified in undertaking an examination which would have exposed to injury the only example as 

 yet preserved of this remarkable hydroid. 



The height of the hydranth in the specimen, from its base to its summit, is about half an 

 inch, while the diameter of the basal portion is about three tenths of an inch. Tubularia insignis 

 nuist, indeed, when in a living state, be a magnificent hydroid. Nothing, however, can be deter- 

 mined from the specimen regarding the colour of either hydranth or gonophores, the original 

 colour of these parts having been entirely discharged by the action of the spirits ; that of the peri- 

 sarc, however, has probably remained unchanged. It is of a light brown in the distal parts of the 

 stem, becoming darker towards the base. Where the transparency of the perisarc allows a view 

 of the contained coenosarc, numerous longitudinal parallel striae may Ijc seen, doubtless indicating 

 the presence of a system of longitudinal coenosarcal canals. 



The gonosome has scarcely attained complete maturity, only two or three gonophores being 

 sufficiently advanced, among the multitude of immature ones, to allow of even the approximate 

 determination of their proper form. 



The only known facts regarding the history of this unique specimen are found in a short 

 appended note, which states that it was obtained at Dieppe, by M. L. Rousseau. 



W Sub-genus Thamnocnidia, Agassiz. 

 Sporosacs without evident gastrovascular canals, apical processes conical. 



5. Tubularia laetnx, Ellis and Solandcr. 

 Plate XXI. 



FuCUS DEALENSIS FISTULOSUS LARYNGiE SIMILIS, RciH, Syn., i, 39. 



Tubular coralline, wrinkled like the windpipe, — Ellis, in Phil. Trans, for 1754, vol. 



xlviii, p. 504, tab. xvii, fig. l. 

 CoRALLiNA tubularia LARYNGi-siMiLis, — EUis, Coral., p. 30, pi. xvi, fig. b. Bast., Opusc. 



Subsc, p. 28, tab. ii, figs. 3, 4, aud tab. iii, 



figs. 2 — i. 



' I must here express the obHgations I am under to Prof. Milne-Edwards, and Prof. Lacaze du 

 Thiers, for the opportunities they have afforded me of examining this aud other specimens of the 

 museum. 



