NO. 5 OSBURN : BRYOZOA 21 



Vibracular chamber elongate and slender, the groove longitudinal; 

 seta small and weak, scarcely longer than a zooecium. There are two 

 axial vibracula. Radicle chamber directly proximal to the vibracular 

 chamber; radicles smooth, without barbs. 



Ooecium elongate, 0.16 mm long by 0.13 mm wide, smooth, imperfo- 

 rate, with the distal end inclined toward the axis of the internode. 



The species is named in honor of Sir Sidney Harmer, whose critical 

 work on Scrupocellaria and related genera has been of the highest 

 importance. 



Type.—AHY no. 3. 



Type locality. — Station A18-39, and At505, San Nicolaas Bay, Aruba 

 Island at 23 to 24 fms. 



Scrupocellaria bellula, new species 

 Plate 4, Figs. 1-3 



Zoarium small and unbranched, except at the base where a branch 

 arises from the front of the ancestrula and extends in the opposite direc- 

 tion to the primary branch ; in one colony a joint occurs in the main 

 branch above the fourth zooecium, and this joint is tubular and appears 

 to be concerned with only one zooecium (similar to the condition in 

 Scrupocellaria [Menipea] aciileata [d'Orbigny] ) ; the internodes are 

 decurved and arcuate, the frontal side uppermost. 



Zooecia small, 0.30 to 0.40 mm long by 0.18 mm broad at the widest 

 part and narrowed to 0.12 mm proximally. The short-elliptical opesia 

 occupies half or more of the frontal area, the mural rim thin and elevated. 

 The scutum covers most of the opesia and is remarkably branched, its 

 central area is fan-shaped and this is bordered by 6 to 8 short spines 

 which bifurcate until as many as 30 minute points are produced. The 

 distal spines are 5 to 7 in number, 3 or 4 outer and 2 or 3 inner; the first 

 outer spine is cervicorn with 4 or 5 prongs, resembling that of S. frondis, 

 the second and sometimes the third outer are bifurcate ; the first inner 

 spine is bifurcate and sometimes has 4 points. The frontal and lateral 

 avicularia are rare, very minute, little elevated, with a short triangular 

 mandible. The vibracular chamber is small and short, triangular in 

 form, the groove transverse, the seta delicate and not longer than a 

 zooecium; the radicle chamber proximal, the radicles about 0.03 mm in 

 diameter and retrorsely barbed. No axillary vibracula. 



The ovicell is round, with a slightly upturned lip, perforated with 



