NO. 5 fraser: hydroids 271 



bend is at the base of the hydrotheca. The hydrotheca is of medium length 

 and width for the genus, slightly ventricose, and expanding towards the 

 margin. There is an internodal septum at the base of the supracalycine 

 nematophore and at the base of the hydrotheca, and there are 3 others 

 between; they show well in the internode and are indicated in the hydro- 

 theca. On the margin of the hydrotheca, there is a small, sharp, median 

 tooth, but the remainder of the margin is even or nearly so. The supra- 

 calycine nematophores are short and curved, reaching but little above the 

 margin of the hydrotheca; each has 2 openings; the 1 mesial nematophore 

 is not attached to the base of the hydrotheca, but is attached to a thick- 

 ened part of the internode just a short distance below the base of the 

 hydrotheca ; it is short, not extending outward farther than the base of 

 the hydrotheca. On the stem, there is a tubular nematophore opposite to, 

 or slightly above, the hydrocladial process, and 3 or 4 in a series between 

 2 of these in succession. 



Gonosome. — Not observed. 



Distribution. — Station 810-38, off Barrington Island, Galapagos, 48- 

 73 fathoms; Avalon Bay, Santa Catalina Island, 98-116 fathoms. 



Remarks. — This species bears much resemblance to C. distornus 

 Clarke, obtained south of Jicarita Island, Panama, 556 fathoms, but the 

 hydrothecae are not so long and slender; there is no nematophore near 

 the distal end of the hydrocladial internode, and the internodal septa are 

 well marked. It may have been derived from C. distomus but if an in- 

 crease in the number and distinctness of the internodal septa is a stable 

 condition in Eastern Pacific species of Cladocarpus, it may be that C. 

 moderatus is an older species. 



Gladocarpus pinguis, new species 

 Plates 36, 37, Fig. 41 



Trophosome. — Colony consists of a simple stem, usually unbranched, 

 15 cm, which is divided into regular internodes by fairly well marked 

 nodes; each internode in the distal portion gives rise to a hydrocladium. 

 In the specimen described, all of the hydrocladia with the exception of 

 those on the last 2 cm of the stem were broken off; the longest of those 

 remaining is 8 mm. The alternate hydrocladia are fronto-laterally placed, 

 so that the bases come out at an angle of about 120°. The hydrocladial 

 internodes are relatively short; there are 4 internodal septa strongly 

 marked, 1 at the base of the supracalycine nematophore, 1 near the base 

 of the hydrotheca, and 2 between. The squat hydrotheca is nearly as 



