NO. 2 fraser: hydroids 113 



succession making an angle of about 60°. The nodes in the hydrocladia 

 are quite distinct, and, as the hydrothecae are quite close to each other 

 and are short and stout, the internodes are short also. The margin of 

 the hydrotheca bears nine teeth, the median one, small but sharp, 

 straight or slightly retrorse; all the others are larger, more rounded at 

 the tip, but not very deep. The intrathecal ridges are distinct. The 

 mesial nematophore does not project very far from the face of the 

 hydrotheca and does not reach the margin of the hydrotheca; the supra- 

 calycine nematophores are large, reaching above the margin of the 

 hydrotheca; the three nematophores on each cauline internode are simi- 

 larly tubular. 



Gonosome. — The corbulae are rather numerous and are conspicuous 

 on account of their great length, with 17 or 18 pairs of leaves in the 

 fully developed corbula. The margins of the leaves are lobed, the lobes 

 being som.evvhat incised, and, in consequence, when the lobes of the 

 two adjacent leaves meet, there are distinct lenticular spaces, or openings 

 into the interior of the corbula. There is one hydrotheca on the hydro- 

 cladium between the corbula and the stem. 



Aglaophenia pinguis, new species 

 Plate 16, Fig. 3 



Trophosome. — Colonies up to 18 cm., simple, unbranched, with 

 dark brown stem, and much lighter brown hydrocladia. The stem is 

 divided into regular internodes by transverse nodes, with a hydrocladial 

 process on each, some distance from the end, the hydrocladia alternating 

 from side to side. Hydrocladia nodes distinct; internodes short, with 

 little space between the successive hydrothecae; hydrothecae broad in 

 both diameters as compared with the length, adherent throughout prac- 

 tically the whole length; two intrathecal ridges well marked; margin 

 with eight similar, straight, rather blunt, teeth. Supracalycine nemato- 

 phores curved, reaching to, or slightly above the margin of the hydro- 

 theca; mesial nematophore short, but projecting well out from the 

 hydrotheca; two cauline nematophores on each internode of the stem, 

 one well below, and the other close above, the hydrocladial process; 

 two on the hydrocladial process, one on the face and the other on the 

 back. 



Gonosome. — Corbulae numerous, scattered throughout the length of 

 the colony, deep for the length, with nine or ten pairs of leaves; one 

 hvdrotheca between the corbula and the hydrocladial process. 



