736 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



The zoaria are stalked, arising directly from small irregularly cylindri- 

 cal adherent basal discs. The basal discs are firmly attached to the sub- 

 strata; rocks, mollusk shells, or, as in the case of some of those in the 

 Hancock collection, attached to colonies of the cheilostome bryozoan 

 Discoporella umbellata (Defrance), 1823. The zoaria are a pale brown 

 to light tan in color. The zoarial length is variable, ranging from 8 to 

 5.8 cm. The zoaria may be solitary, or secondary zoaria may grow 

 attached to the pedunculate portion of an older zoarium, where they 

 have developed from settled larvae. 



Anatomically, a zoarium may be divided into two distinct sections, a 

 peduncle composed of muscular kenozooecia, and a capitulum at the 

 apex of the peduncle, composed of functioning autozooecia. The peduncle 

 is cylindrical, stout, and strongly annulated in the older zoaria. Accord- 

 ing to the figure in Fewkes' original description, the stalk is extremely 

 slender. This is not the case with specimens in the Hancock collection, 

 the peduncular portions of the mature zoaria having a diameter ranging 

 from 0.50 to 0.75 mm. The capitulum, ranging in length from 2 mm 

 to 3.5 cm, is an expanded ovoid structure, bulb-like in appearance with 

 a coriaceous cuticle. It is composed of the functional autozooecia, closely 

 united, somewhat indistinct, with the aperture located within the center 

 of a low papillate process. The tentacle number, determined by means 

 of serial sections, is 18. 



The specimens reported by Miss Robertson (1902) were dredged off 

 Santa Catalina Island, California, while those recorded by O'Donoghue 

 came from the vicinity of Vancouver Island. The specimens in the 

 Hancock collection are from Hancock station 924-39, Socorro Island, 

 Mexico; Guadalupe Island, Mexico, collector C. L. Hubbs; and Dillon 

 Beach, California; in depths ranging from 17 to 46 fathoms. 



Division 2. Paludicellea Allman, 1856 



Zooecia connected by stolon-like tubular extensions that may or may 

 not possess internodes separated by septulae. A zooecium may form a 

 daughter zooecium by means of a bud produced near its distal extremity. 



Family Nolellidae Harmer, 1915 



"The Family Nolellidae is characterized by the great development of 

 the peristomial part of the zooecium. This region is typically much 

 elongated and its ectocyst frequently includes muddy particles. The 



