148 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



laria, which occasionally replace the normal ones, have a long, curved, 

 talon-like rostrum 0.25 to 0.30 mm in length and both the rostrum and 

 mandible are recurved at the tip. 



The vibracular chamber is small and short, its distal end truncate, 

 its groove transverse ; the seta vv^eak and not much longer than a zooeci- 

 um ; the radicle chamber is rounded and about as large as the vibracular 

 chamber; the outer border of the double chamber is strongly sinuate. 

 The radicles are smooth. 



The form of the zooecia and the giant avicularia resemble S. unguicu- 

 lata new species, from the Galapagos Islands, but S. talonis is much 

 smaller, the scutum is vestigial or wanting, the spines very weak and the 

 vibracular groove is transverse. 



Type, AHF no. 39. 



Type locality, Perlas Islands, Panama. (No other data.) Author's 

 collection. 



Scrupocellaria unguiculata new species 

 Plates 17, figs. 1 and 2, and 19, fig. 6 



Zoarium rather large and coarse, the internodes elongate (1.00 to 

 4.50 mm in length) and broad (0.40 to 0.50 mm), straight and little 

 divergent. Joints broad, immediately proximal to the opesia of the outer 

 zooecium. 



Zooecia large (0.50 to 0.60 mm long by 0.26 mm wide at the broad- 

 est part) ; the elliptical opesia occupying about half of the frontal length 

 and the zooecium considerably narrowed proximally (about 0.15 mm). 

 The descending cryptocyst is well developed and finely granular. Three 

 long and very strong spines, jointed at the base, are present, two outer 

 and one inner and the one on the outer angle is the smallest. The scutum 

 is very broad, covering practically all of the opesial area, evenly rounded 

 at both ends, attached slightly distal to the middle of the opesia by a 

 very strong peduncle, and its alcicorn cavity is highly developed. 



The frontal avicularia are infrequent, small, pointed and directed 

 more or less laterally. The lateral avicularia are of two types. The 

 normal ones are situated between the outer and distal spines, moderate 

 in size, with hooked rostrum and triangular, hooked mandible. Giant 

 avicularia are also present, scattered over the zoarium, sometimes several 

 to an internode and sometimes wanting. This type has a very long, curved, 

 talon-like rostrum or beak, strongly decurved at the tip, and the mandible 

 is narrow or ligulate with a curved tip. 



The vibracular chamber is short, about one-fourth as long as a zo- 

 oecium, somewhat triangular in form, the radicle chamber at its outer 



