Bibliographical Notices. 189 



with twigs : likewise with slender, prolonged, plumose vegetations 

 sometimes interspersed, whereon, besides hydrse, are borne long 

 ampullate axillary vesicles, each containing many planulse ;" (3.) that 

 A. ramosa may have three vesicles all different from each other in 

 form ; (4.) " that vigorous reproductive energies reside in the ramosa, 

 which are readily and frequently exhibited, while similar energies 

 are feeble and rare in the A. indivisa." (p. 209.) 



21. Laomedea dichotoma. Admirably described and figured. The 

 cell of the polype is deciduous. The larva is medusiform, and has 

 some resemblance to a hand-bell. " It swims by jerks, or bounds 

 like the various species of Medusae, from collapse of the body, 

 perhaps aided by the tentacular organs. It pursues all directions, 

 rising, falling, or remaining stationary in equilibrio. Like a group of 

 the Medusa bifida, these creatures narrowly resemble a flock of mi- 

 nute birds wending their course through the expanse of the firma- 

 ment." (p. 216.) 



22. Campanularia verticillata. The margin of the polype-cell is 

 either " plain or serrated," a remark which may tend to reconcile 

 the discrepancies in the descriptions of some allied species. The 

 cells are normally deciduous, falling oif with the decay of the 

 polypes. " The two are mutually dependent on each other," p. 219 ; 

 the very reverse of what exists in the Sertulariadae. The larva is a 

 planule. 



23. Campanularia dumosa. The generic relations of this species 

 remain unascertained. Its structure, says Sir J. Dalyell, is very dif- 

 ferent from Laomedea dichotoma or Campanularia verticillata. The 

 polype is a vivid grass-green. The mode of propagation is unknown. 



24. Campanularia syringa. Another doubtful member of the genus 

 Campanularia. The structure of the cell is peculiar, nor does it fall 

 off on losing the polype. 'J'his has about si.\teen tentacula. " That 

 number has been ascertained as the complement of several. I have 

 not observed any of the hydrge with only eight tentacula, which is 

 in fact a very rare characteristic of any of the marine hydraoid zoo- 

 phytes," p. 223. — The species which follows aflfords an exception to 

 this remark. 



25. Sertularia arcta. This is the same as the Campanularia inter- 

 texta of Couch. The polype has eight tentacula, and a few indivi- 

 duals only have ten. The larva is a planula, " but instead of being 

 generated within a pod or vesicles as others from the hydraoidal 

 Sertularice, its matrix consists of a congeries of cavities or compart- 

 ments, as seen in the surface of the mass. An aperture being dis- 

 covered in the middle of each after the jjlanula has been discharged, 

 we may presume that no more than one is contained in a comjjart- 

 raent," p. 225. The production is evidently the type of an undefined 

 genus. 



We shall continue our analysis in a future number. 



In the Press. 



We are glad to learn that Mr. Gosse, author of the ' Birds of 

 Jamaica,' ' Canadian Naturalist,' &c., is about to publish a series of 



