8o 



HYDROIUA II 



2 ooo m. 



2 00 m 6 oo m | ooo m. 



Fig. XLI. Finds of Aglaophenopsis cornuta in the Northern Atlantic. 



sarcothecae, which, however, are here generally somewhat smaller than on the hydrocladia. The gono- 

 theea has a well developed upper lip, which does not appear clearly from Nutting's illustration and 

 description. It is domed strongly forward, so that the aperture becomes turned down towards the base. 

 Aglaopliawpsis cornuta is a tvpical deep-sea species which has only in Davis Strait been 

 observed at ioo, and in Danmark Strait at 138 fathoms depth; it can thus also penetrate up into the 

 lower part of the littoral region. The species probably belongs strictly speaking to the warm, deep 

 northern part of the Atlantic; it moves up into Davis Strait, where it appears to be of not infrequent 

 occurrence (fig. XLI) and has now, as we see, also been recorded from Danmark Strait. As it is not 

 known from other localities than those mentioned and the waters off Nova Scotia, we are justified 

 in characterising it for the present as a west atlantic species. 



Aglaophenopsis (?) pharetra n. sp. 



The colony pinnate with polysiphonic stem, monosiphonic in the extreme portions, and having 

 the primary tube indistinctly segmented. Each of the internodia of the stem bears at two thirds 

 of its height a well defined, fairly short apophyse, and three unpaired sarcothecte, two in the median 

 line below the apophyse, and the third in the corner between the stem and the apophyse above the 

 origin of the latter. The alternately placed hydrocladia form almost a right angle with the stem; 

 the)' are divided into long internodia, each of which bears a hydrotheca, and three sarcothecae, a 

 supracalycine pair at the opening of the hydrotheca and an unpaired proximal about midway between 

 the base of the hydrotheca and the proximal end of the internodium; the opening margin of the 



