NO. 5 fraser: hydroids 279 



cladial internode is short, athecate; the second is much longer and is 

 thecate; the third, athecate, is not as long as the second; after this, thecate 

 internodes, like the second, and athecate internodes, like the third, follow 

 in regular alternation. The nodes are flanked on each side with well 

 marked septa. In the thecate internode, there is a characteristic, promi- 

 nent septum at the base of the hydrotheca. The hydrotheca is nearer the 

 distal end of the internode, but still some distance from the distal node. 

 The supracalycine nematophores are unique in their location, as they are 

 placed so far to the side of the internode, placed on a small shelf or pro- 

 tuberance; they are relatively large. There is a mesial nematophore on 

 each internode but the first, placed near the proximal end. On the hydro- 

 cladial process, the nematophore is placed on the face rather than in the 

 axil, but there is a pseudonematophore directly on the process. There is 1 

 lateral nematophore on each cauline internode, nearer the proximal node, 

 on the side opposite the hydrocladial process. 



Gonosome. — (From an Anacapa specimen.) The gonangium, arising 

 from the hydrocladial process, is much similar to that in several other 

 species of the genus, e.g., P. setacea (Ellis), that is, elongated, elliptical, 

 tapering to each end, but especially to the distal end; there is a small 

 terminal opening. 



Distribution. — Station 1253-41, 8 miles west of Cedros Island, 60-65 

 fathoms; ^ mile WNW of Anacapa Island, 41-43 fathoms. 



Remarks. — This species bears some resemblance to P. septata Fraser, 

 but it has none of the extra septa of this species, except the prominent 

 one at the base of the hydrotheca ; in this species, the supracalycine nemat- 

 ophores are placed in the usual position, not placed so far laterally as in 

 P. insolens. P. septata has been obtained only off the Peruvian coast, a 

 long way from the location of P. insolens. 



Plumularia Integra, new species 

 Plate 39, Fig. 45 



Trophosome. — ^The colony is quite long, 7 cm, and slender, as the 

 hydrocladia are short, not more than 5 mm. The stem is simple, slender, 

 unbranched, without nodes, or with nodes so faint that they can scarcely 

 be recognized ; the portion of it that represents an internode is long so that 

 the hydrocladia on the same side (they are regularly, alternately ar- 

 ranged) are relatively distant. The hydrocladial process is long; the first 

 internode is short and athecate ; this is followed by a thecate internode of 



