NO. 5 OSBURN : BRYOZOA 15 



Pyrulella caribbea, new species 

 Plate 2, Figs. 1-3 



Zoarium encrusting on a nullipore, loosely attached by dorsal promi- 

 nences. 



Zooecia small, 0.25 to 0.30 mm in length ; widely separated and 

 joined by lateral tubular processes, usually six in number, with rounded 

 interspaces. Zooeciules often replace functional zooecia, and some of 

 these have minute oval avicularia. The opesia is elliptical and occupies 

 all of the front except for a very small proximal gymnocystal area. The 

 walls are thin and high and provided with spines as follows : one pair 

 of long distal spines projecting forward (these may be as much as 0.25 

 mm long), two or occasionally three pairs of lateral spines similar to the 

 distal ones but projecting upward, and proximal to these on each side are 

 five or six shorter spines which are curved rather high over the opesia. 



The ovicell is slightly longer than broad, with only a suggestion of 

 an oral lip, and in place of the usual rounded frontal foramen there is a 

 longitudinal slit which is sometimes closed to form an imperforate 

 ooecium. 



The species dif^^ers from P. tubulata Hastings by its much smaller 

 size, the greater number and the greater length of the spines and by the 

 differences in the ovicell. From P. sejuncta (Waters) it differs in the 

 smaller size, the spines and in lacking a triangular area on the ovicell. 



Type.—ARY no. 2. 



Type locality. — Station A17-39, 3 miles NW of San Nicolaas Bay, 

 Aruba Island, 71 to 96 fms, two colonies. 



Genus CHAPPERIA Willey 1900 

 Ghapperia cervicornis (Busk), 1854 

 Harmer 1926: 230 (Synonymy and discussion). 



A little doubt must be attached to the identification of this species, 

 as the ovicells are wanting. Other characters agree : the presence of four 

 branched distal spines, some of which bear 4 to 6 points ; the occasional 

 presence of a small median avicularium, sessile or nearly so, distal to 

 and between the inner spines, and the nature of the cryptocyst, opesia 

 and occlusar laminae. 



Its distribution hitherto known is in the waters about Australia, the 

 East Indies, New Zealand and the Indian Ocean and it has not been 

 known in the Atlantic area. 



Distribution. — Stations A18-39, and At505, Aruba Island, 23 fms, 

 several small colonies encmsting coralline algae. 



