NO. 5 FRASER : HYDROIDS 275 



branched irregularly, commonly a greater number on the upper side, al- 

 though there is but 1 branch to each internode; this secondary branch is 

 short, commonly with a single thecate internode, but sometimes with 2 

 internodes; each corresponds to the proximal portion of the unbranched 

 hydrocladium. The normal hydrocladium is divided into regular inter- 

 nodes, each node being flanked on each side by a septum. The first inter- 

 node is short and athecate ; all the others are longer and are thecate ; the 

 first one is shorter than any of the others ; in all cases, the hydrotheca is in 

 the distal third of the internode. In these internodes, there is a well 

 marked septum at the base of the hydrotheca. The supracalycine nemato- 

 phores are of the usual type; in the first thecate internode, there is 1 

 mesial nematophore, in all of the others, 2 of these. On the stem there is 

 a nematophore in the axil of the process and 1 on the main part of the 

 internode, on the side opposite to the process, not far from the proximal 

 node. 



Gonosome. — The gonangia are much like those in several species of 

 this genus, elliptical, but tapering rather abruptly to each end ; they grow 

 out from the angle of the hydrocladial processes, and they may be nu- 

 merous, appearing throughout almost the whole length of the stem ; there 

 may even be a pair of them in the 1 axil. 



Distribution. — Station 1261-41, 4 miles north of Dewey Channel, 

 Lower Calif., 24-25 fathoms; 3 miles NW of Natividad Island, 30-31 

 fathoms; Puerto Escondido, Gulf of California, 18-21 fathoms; east of 

 San Marcos Island, 18 fathoms. 



Re?narks. — The secondary branching in this species resembles some- 

 what that of P. corrugata Nutting, but it is more extensive; the hydro- 

 cladium itself, however, is quite different in the division into internodes, 

 and in the position of the nematophores ; in these respects, it is quite un- 

 like any other Eastern Pacific species, or in the Western Atlantic, so far 

 described. 



Plumularia alicia Torrey 

 Plumularia aliciaToRRBY, Hj^d. Pacific Coast, 1902, p. 75. 



Eraser, Hyd. Pacific Coast, 1937, p. 186. 



Eraser, Hancock Hyd., 1, 1938, p. 62. 

 Distribution. — Off Redondo Beach; 3 miles off Seal Beach, 11 fath- 

 oms; 2 miles off Belmont Pier, 7-10 fathoms; off Huntington Beach, 5 

 fathoms; in channel, Newport Harbor, 4-10 fathoms; 5 miles — 152° 

 from San Pedro breakwater, 17-19 fathoms; 3 miles NW of Natividad 

 Island, Lower Calif., 30-31 fathoms; off Magdalena Island, Tres Marias 

 Islands, Mexico, 13 fathoms. 



