HYDROIDA. — BALE. 305 



Mesial sarcotheca a little below the hydrotheca, short, 

 conical in lateral view, oblong in front view ; terminal 

 aperture a transverse slit crossing the end of the sarcotheca 

 and slightly enlarged at the angles, inferior aperture rather 

 large, with sub-tubular border ; cauline and lateral sarco- 

 thecse similar to the mesial, the cauline numerous, arranged 

 in a single series along the whole front of the stem. 



Gonangial (?) secondary ramules given off from some of 

 the internodes of the hydrocladia, consisting of a short 

 proximal internode and two (or more ?) longer ones, the 

 latter ventricose, with one or two lateral sarcothecse. 



This species is closely allied to Cladocarpus (?) bathyzonatus, 

 Ritchie, and I have had some doubt as to the propriety of 

 separating it. It is so extremely slender and so readily 

 tangled that it is not easy to isolate complete colonies, and 

 I did not succeed in getting any perfect to the base. One 

 only had on the lower portion a single supplementary tube, 

 the rest, so far as they extended, were monosiphonic. The 

 greatest disparity exists between the distances of the nodes, 

 which are conspicuous and very oblique ; measuring by the 

 number of sarcothecse, which are at nearly uniform distances 

 along the stem, we find internodes bearing any number from 

 one up to twelve or thirteen, and there are similar variations 

 in the number of sarcothecse which intervene between two 

 hydrocladia. Some of the shorter internodes support sarco- 

 thecse only. These irregularities are most marked in the 

 lower portions of the stems ; on the distal portions a com- 

 paratively regular sequence may prevail, the internodes there 

 supporting usually a hydrocladium and nine to twelve 

 sarcothecse. 



The two series of hydrocladia are both directed so strongly 

 towards the front that, placed on a slide, they fall to one 

 side, and their arrangement appears uniserial unless closely 

 examined, when it is seen that they spring alternately from 

 right and left of the median row of sarcothecse. 



The hydrothecal internodes are about .80 mm. long (the 

 hydro thecse themselves being about .60 mm.), and the hydro- 

 thecse are like those of C. (?) bathyzonatus except that their 

 proportionate length is greater, their abcauline wall not so 

 narrowed in at the central part, and the anterior tooth 

 different in form. The little perisarcal flap opposite the 

 hydropore is as described by Ritchie. The sarcothecse also 

 agree with those of Ritchie's species, except that I did not 

 observe so much diversity in the terminal orifices. In the 

 lateral view a sarcotheca appears pointed, in the front view 



b 



