482 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



prominent, recumbent on the distal zooecium but not immersed, per- 

 forated. Genotype, Lepralia collaris Norman, 1867 :204. 



The above description is drawn from a specimen from Norman's 

 collection and from the type locaHty, loaned me by Dr. Anna B. Hastings 

 of the British Museum. 



Phylactella aperta new species 

 Plate 59, figs. 1-2 



2^arium encrusting on a shell. Zooecia ovate, very distinct, slightly 

 ventricose and more elevated distally; length 0.65 mm (0.55 to 0.70), 

 width 0.40 mm (0.35 to 0.50) ; frontal a reticulated olocyst covered by 

 a thin pleurocyst, imperforate except for small well-spaced areolar pores 

 and sometimes a few additional ones. The primary aperture is slightly 

 quadrangular, longer than broad (0.13 by 0.11 mm), the proximal border 

 a little arcuate, cardelles minute. The operculum is moderately chitinized 

 and bears a narrow sclerite a short way within the border. The secondary 

 peristome (an extension of the frontal) forms a high funnel-shaped wall 

 proximally and laterally, extended into large flaring lappets on the sides, 

 but wanting entirely on the distal border. No spines. A small pointed 

 slightly elevated avicularium is present on most of the zooecia proximal 

 to the peristome and at or near the midline ; it is asymmetrical in origin 

 and arises from an areolar pore on one side only ; the mandible is directed 

 proximally, pointed and with a complete hinge bar. 



The ovicell is hemispherical, prominent, resting on the distal zooecium 

 but not embedded ; perforated by small pores which are slightly elevated ; 

 a small flattened imperforate area above the orifice. 



The genotype of Phylactella has no avicularia and I am not aware 

 that they have been found in any other species of the genus. However, 

 all of the other features of aperta agree so closely with P. collaris that 

 they must be congeneric. Through the kindness of Dr. Anna B. Hastings 

 of the British Museum I have been able to study a specimen of collaris 

 from the Norman collection and from the type locality, Antrim, Ireland. 



Type, AH F no. 106. 



Type locality, Hancock Station 450, Cartago Bay, Albemarle Island, 

 Galapagos, 0°55'00''S, 90°30'00"W, at 60 fms, one colony in repro- 

 duction. 



