344 BIOLOGICAL SURVEY OF 



of Vineyard Sound and Buzzards Bay. The others appear 

 to stop rather abruptly at Crab Ledge, off Cape Cod, and the 

 outer waters of the Nantucket Shoals. This species, like the 

 preceding, was confused by Verrill with R. scahra, and his 

 Vineyard Sound records for that species doubtless are to be 

 referred to R. hilaminata. 



The zooecia are large, smooth, or with small ribs which run 

 part way to the base of the rostrum. Behind the large aper- 

 ture the peristome rises into a double fold with a deep notch 

 between the thin lip-like projections, and through this notch 

 the narrow denticle is visible on the proximal border of 

 the primary aperture. Ooecium very large, hemispherical, 

 smooth and punctured, obscuring about half of the aperture 

 and the frontal surface of the distal zooecium as far as the 

 base of the rostrum. 



Rhamphostomella eadiatula (Hincks), 1877. PL 12, figs. 

 1-2. (Osburn, 1912 a, p. 286, off Cape Sable, Nova Scotia.) 

 Rare, noted only at dredging stations 6, 69, 94, and 95. This 

 is the southernmost record to date. Whiteaves did not list it 

 for the Gulf of St. Lawrence, but the colonies are always very 

 small in comparison with . others of the genus and may be 

 readily overlooked. I have seen specimens from Hudson 

 Strait, and to the northward it extends from Greenland to 

 Spitzbergen. 



The zooecia are small, especially in comparison with other 

 members of the genus, and the frontal surface bears strong 

 radiating ribs. The peristome rises high on the sides of the 

 aperture and in fertile zooecia extends forward upon the sides 

 of the ooecium. The primary aperture bears a denticle on 

 the proximal border, the secondary aperture is quite irregular, 

 with a proximal notch within which is located a small avicu- 

 larium. The secondary calcification is quite heavy, but does 

 not involve the smooth rounded ooecia, which are provided 

 with a few small scattered pores. The zoaria usually form 

 small irregular nodules on stems of various kinds. 



