706 Leuckart: Bericht üb. d. wissenschaftlichen Leistungen 



Die Genusbezeichnung Halicornaria möchte Verf. für solche 

 Plumulariaden beibehalten wissen, welche den allgemei- 

 nen Typus von Aglaophenia besitzen, aber weder Corbu- 

 lae, noch Phylactogonien haben. 



Die vom Verf. neu aufgestellten oder emeudirten Ge- 

 nera werden folgendermaassen charakterisirt. 



Thyroscyphus n. gen. e fam. Campanul. Hydrocaulus divi- 

 ded into iuternodes, each internode carrying a hydrotheca. Hydro- 

 thecae pedunculate; orifice closed by an operculum, which is formed 

 hy four converging valves, Gonosome not knowu. 



Oplorhiza n. gen. e fam. Lafoen. Hydrothecae tubulär, pro- 

 vided with a floor and having the orifice cut into thin collapsible 

 Segments; borne by peduncles which spring from a creeping net- 

 work of tubes. Ilydrorhizal network carrying peculiar appendages 

 which are in the form of tubulär receptacles with an orifice in the 

 summit, and which euclose a granulär fleshy column, supporting a 

 Cluster of thread-cells. Gonosome not known. 



Desmosci/phus AUm. (Char. emend.). Hydrocaulus joinled, each 

 internode corresponding to one or more pairs of hydrothecae. Hy- 

 drothecae adnate to one another in pairs, each pair adnate to the 

 aide of the hydrocaulus. Gonangia simple, borne along the front of 

 the hydrocaulus. 



Halopteris n. gen. e fam. Plumul. Hydrosoma pinnate, i>lu- 

 mose; stem and pinnae divided into internodes. Hydrothecae ad- 

 nate to side of pinnae, unilateral. A pair of nematophores flanking 

 the hydrotheca, one on each side, and adnate to it. Mesial nema- 

 tophores two (or more), not adnate to the hydrotheca, fixed, mono- 

 thalamic, with an oblique aperture contiaued into a lateral slit. Go- 

 nosome not known. 



Antennopsis n. gen. e fam. Phimular. Stem jointed, sen- 

 ding off scattered jointed ramuli which carry the hydrothecae. Hy- 

 drothecae with entire margin, unilateral, associated with a pair of 

 movable supracalycine nematophores and with a movable azygous 

 nematophore borne along the hydrothecal side of the ramuli. Go- 

 nangia not protected by corbulae or other appendages, 



Hippurella n. gen. e fam. Plumular. Hydrocaulus bran- 

 ched, ultimate ramuli pinnate on the proximal portion of the bran- 

 ches, but distributed on all sides towards their distal extremities. 

 Hydrothecae borne on the ultimate ramuli, iinilateral, with entire 

 margin, associated with a pair of supracalycine nematophores, and 

 with azygous nematophores along the hydrothecal side of the ra- 

 mulus. Gonosome not known. 



Monostäechas n. gen. e fam. Plumular. Stem branched; 



