" ENDEAVOUK " SCIENTIFIC RESULTS. 178 



Aglaophenia calycifera, sp. nov. 



(Plate xxxvii., figs. 3-4.) 



Hydi'ophyton about six inches in height, polysiphonic, I'ather 

 slender, a few branches in one plane at an angle of about 45°, 

 springing from the primary tube and replacing a hydrocladium ; 

 nodes oblique, faint. Hydrocladia alternate, divergent at about 

 40°, both series borne on the front, nodes transverse. 



Hydrothecse almost parallel with the hydrocladium, a narrow 

 intrathecal ridge near the base, at right angles to the internode, 

 with a fold from it crossing the cell and curved backwards ; 

 border with a shai'p median anterior tooth and about three 

 shallow crenations on each side, back entire, adnate. Two 

 septal ridges in the internode, one opposite the intrathecal ridge, 

 the other at the base of the lateral sarcotheca?. 



Mesial sarcotheca about two-thirds the length of the hydro, 

 theca, arched throughout, much widened towards the aperture- 

 which is oblique, and the full width of the sarcotheca. Lateral 

 sarcotheca? large, adnate up to the hydrotheca-margin, wider 

 towards the aperture. Cauline sarcotheca? like the laterals, two 

 at the base of each hydrocladium in front. 



Gronangial branch replacing a hydrocladium, commencing 

 with several elongated internodes bearing hydrotheca? ; corbula — 

 female, composed of about ten or twelve pairs of ribs, narrow at 

 the base but widening immediately into broad leaflets, which 

 unite to form the closed corbula ; a short spur projecting for- 

 ward from the distal side of each leaflet close to the base, sup- 

 porting a modified hydrotheca with its lateral sarcotheca?, one or 

 two sarcotheca? above and below, distal edges of the leaflets 

 giving rise to large free-edged wings directed outward and rising 

 above the corbula, their edges armed with close series of cup-like 

 sarcotheca?; one or two free leaflets usually at the distal or both 

 ends of the corbula ; male — with seven or eight pairs of leaflets, 

 the lateral wings smaller and genei'ally developed only on the 

 distal portion of the corbula. 



Colour. — Light brown. 



One of the most noticeable features of this species is found 

 in the cup-like character of the sarcotheca?, which all agree in 

 becoming wider to the aperture, which extends right across. 

 The form of the apertures, however, clearly indicates in most cases, 

 especially in the mesial sarcotheca?, that they are the i-esult of 

 two wide orifices — terminal and inferior — cutting into each 

 other. The narrow intrathecal ridge and the base of the lateral 

 sarcotheca? are nearer together than in most species, consequently 

 the same condition prevails in the septal ridges which accompany 



