Deep-sea and Shallow -water Ilydrozoa. 13 



lateral nematophores and a goaotlieca, is the exact condition 

 foand in Streptocaulas ; while in Gladocarpiis this condition 

 is carried a step further, in that the rarauli bscome branched, 

 with few or manj joints, some of which only bear gonothecse. 

 ScMzotricha has been referred bj Prof, AUraan to the 

 section Gymnocarpa of the Eleutheroplea, and Gladocarpus 

 to the section Phylactocarpa of the Statoplea ; and, judging 

 on the point of function as to whether the reproductive appen- 

 dages of the hjdrocladia on which the gonothecee are placed 

 are or are not protective, the genus Streptocaulas must be 

 removed from the Phjlactocarpal Statoplea, among which it 

 was temporarily placed, to the section Gymnocarpa. On the 

 other hand, since the reproductive appendages and segments 

 which bear the gonothecas seem in the three cases to be strictly 

 homologous, and thus but rudimentary or varying forms of 

 the phylactocarp, it seems necessary, if the terms Gymmcarpa 

 and Phylactocarpa are to be retained with any definite 

 meaning, that all three genera should be placed amono- the 

 phylactocarpa! forms. 



Order HYDROCORALLTNE^. 

 Family Stylasteridae. 



In the following descriptions of new species of the genus 

 Distichopora detailed mention is made of the characters of the 

 surface of the coenosteum, of the form and mode of arrange- 

 ment of the pore-rows, of the relative size, shape, and position 

 of the gastropores and dactylopores, and of the nature of the 

 ampullge. Short descriptions, with special reference to these 

 characters, are also given of those previously-described species 

 which agree with them more or less closely in general form 

 and coloration, in order to point out the more marked differ- 

 ences which are presented by those species. The characters 

 of the ampullae call for special notice in the diagnosis of the 

 species, since well-marked differences in the structure of these 

 parts obtain in different species of the genus. Such certainly 

 may be affirmed after a very careful examination of a large 

 number of stocks in which the ampullae present the appearance 

 of raised more or less vesicular swellings on the coenosteum. 

 For the figures given of the cyclosystems parts have been 

 selected at some distance from the extreme apical points, 

 since at such points the dactylopores become markedly tubular 

 and prominent in all or nearly all species of Distichopora. 



