330 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



with numerous pores; no evidence of an umbo. The primary aperture, 

 0.18 mm wide by 0.15 mm long, is evenly rounded to the cardelles, 

 proximal to which is a rounded sinus about half as broad as the distal 

 part. The operculum has a lunate chitinized border, thinning out to- 

 ward the points of attachment. A low thin peristome extends around the 

 border distal to the cardelles and bears 8 to 12 short, erect, closely 

 set spines. Distal to the peristome is another row of similar but re- 

 cumbent spines of about the same number; occasionally this outside 

 row extends along the side of the front a short distance proximal to the 

 aperture. 



The ovicell is large, 0.40 mm wide, heavily calcified, perforated and 

 prominent ; closed by the operculum ; the aperture of the fertile zooecium 

 slightly broader, 0.20 mm. 



The genus Dakaria as a rule is without oral spines while this has a 

 double row, but the absence of the avicularia, and the closure of the 

 ovicell by the operculum, together with the broad sinus and the lack of 

 a definite peristome on the proximal border which appears to be enclosed 

 between the proximal ends of the distal border, all agree with Dakaria. 



Hincks described the species from New Zealand and I have not 

 found any more recent record. He states that "there are 14 to 16 spines 

 but there may be as many as 40 or 50" ; the largest number I have 

 observed is 26, but evidently with so much variation the exact number 

 is of no consequence. 



Hancock Station 779-38, ofiF Nuez Island, Cocos Islands, Costa Rica, 

 5°34'00''N, 86°59'20''W, one colony at 30 to 50 fms. Also Station 438, 

 Chatham Island, Galapagos, one colony. 



Genus SGHIZOMAVELLA Canu and Bassler, 1917 



"The operculum closes the ovicell. The muscular attachment is 

 usually in the immediate vicinity of the border of the operculum. The 

 rimule is wide and arched. The frontal is a tremocyst. A median avicu- 

 larium occurs on the front wall. There are small oral glands. 23 ten- 

 tacles" (Canu and Bassler). Genotype, Lepralia auriculata Hassall, 

 1842. 



