740 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



elongate sheaf. Examination of a cross section of a stolonal sheaf from 

 an older portion of the colony revealed stolons of uniform diameter, 

 while cross sections made close to the growing tip of the colony disclosed 

 one larger principal stolon surrounded by 4 to 6 secondary stolons of 

 narrower diameter. An individual stolon does not as a rule traverse the 

 entire length of a zoarium. One stolon will give rise to a second at a 

 point located just below (proximally) a septum terminating an inter- 

 node. The newly arisen stolon gains mature diameter at once and pro- 

 ceeds distally paralleling its "parent" and the other stolons of the 

 zoarium. The zooecia arise from the stolons, originating in a linear 

 series within an internode in variable numbers. They are deciduous, the 

 stolons characteristically marked with the scars of departed zooecia. 

 The zooecia are constricted slightly at the point of fusion with the 

 stolon. Morphologically they are elongate, cylindrical, ranging in length 

 from 0.94 to 1.10 mm, and in width from 0.24 to 0.28 mm. The poly- 

 pide contains a prominent gizzard. The tentacles are short, and 12 in 

 number. 



Vesicularia fasciculata differs in two major aspects from the other 

 species in the genus, having an unbranched zoarium, as compared to the 

 branched zoaria of V. spinosa Linnaeus, V. papuensis Busk, and V. 

 harmeri Silen, and it has 12 tentacles as compared to 8 tentacles in V. 

 spinosa and V. papuensis. 



Holotype: U. S. N. M. no. 11053 ; Paratype, AHF no. 134. 



Repository: The United States National Museum, Washington, D. C. 



Paratype : The Allan Hancock Foundation, The University of South- 

 ern California, Los Angeles, California. 



Type locality: Off Point Barrow, Alaska, 18 February 1950, depth 

 162 feet, collector, G. E. MacGinitie. Also Point Barrow, Alaska, 

 August 1, 1949, depth 321 feet, July 1, 1950, depth 118 feet, collector, 

 G. E. MacGinitie. 



Genus AMATHIA Lamouroux, 1812 



Zoaria erect, stolons robust, stiff. Zooecia in biserial arrangement, 

 forming a spiral within an internode. Polypide provided with a gizzard. 

 Genotype: Sertularia lendigera Linnaeus, 1758. 



Amathia convoluta Lamouroux, 1816 



Plate 78, fig. 7 



Amathia convoluta Lamouroux, 1816:160. 

 Amathia convoluta, Harmer, 1915:64. 



