274 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Distribution. — East of Gull Island, south of Santa Cruz Island, 6-10 

 fathoms; San Lorenzo Channel, Gulf of California, 3-5 and 6-15 fath- 

 oms; outside of Guaj'mas Bay, 6-10 fathoms; off Tres Marias Islands, 

 Mexico, 13 fathoms; off La Plata Island, Ecuador, 10 fathoms; Sulivan 

 Bay, James Island, Galapagos, 8 fathoms. 



Genus MONOSTAEGHAS 



Monostaechas quadridens (McCrady) 



Plumularia quadridens McCrady^ Gymno. Charleston Har., 1859, 



p. 199. 

 Monostaechas quadridens Nutting, Amer. Hyd., I, 1900, p. 75. 



Eraser, Hancock Hyd., 1, 1938, p. 61. 



Eraser, ibid., 2, 1938, p. 111. 



Eraser, ibid., 3, 1938, p. 135. 



Eraser, Atlantic Hyd., 1944, p. 334. 

 Distribution. — East of Santa Barbara Island, 36-48 fathoms ; South 

 Bay, Cedros Island, 10-15 fathoms; 3 miles NW of Natividad Island, 

 Lower Calif., 30-31 fathoms; Dewey Channel, opposite San Eugenio 

 Point, 21-24 fathoms; off Braithwaite Bay, Socorro Island, 17-46 fath- 

 oms; San Lorenzo Channel, Gulf of California, 3-5 fathoms; Puerto 

 Refugio, Angel de la Guardia Island, 11-22 fathoms; north of Isla Par- 

 tida, 10 fathoms; Magdalena Island, Tres Marias Islands, Mexico, 13 

 fathoms; off Navidad Head, 25-35 fathoms; off Cape San Erancisco, 

 Ecuador, 15 fathoms. 



Genus PLUMULARIA 

 Plumularia acutifrons Eraser 

 Plumularia acutifrons Eraser, Hancock Hyd., 1, 1938, p. 61. 

 Distribution. — San Quentin Bay, Lower Calif., 10-15 fathoms. 



Plumularia adjecta, new species 

 Plate 37, Fig. 42 



Trophosome. — Colonies grow in small clusters; the stem is stout, and 

 is longer than visual in this genus; the first specimens examined reached 

 a height of 9 cm, but later others were obtained up to 25 cm ; it is divided 

 into internodes that are not of uniform length, by nodes which are not 

 very distinctly marked, although they may be observed quite readily. 

 Each internode gives off a hydrocladial process near its distal end, and 

 these hydrocladia are arranged alternately. In the proximal two-thirds or 

 more, the hydrocladia are relatively short, but in the distal portion, they 

 become more elongate, up to 16 mm, and many of these are again 



