18 
Mr. W. C. Williamson on the Recent 
cies, but I found many orbicular specimens of the true E. mar- 
ginata in wbicb the margin was obviously somewhat thickened 
and rounded^ and others which, as already mentioned, showed the 
horseshoe-like white portion within the margin, nearly surround- 
ing the transparent centre, so that I have no doubt of this being 
merely a variety of the same. It is often mistaken by collectors 
for a form of E. glohosa^ to which it sometimes approximates very 
closely, but from which it may be distinguished by its compressed 
form. 
I have seen one specimen which was trilocular, having three 
transparent margins instead of two. 
Long. 
Diann. 
1 
1 
‘ • 
160 
1 
1 
¥0 • • • • 
TTT 
Too • • • • 
xio 
Swansea, Rossilly, Manorbeer, Portsmouth, Sandwich, Ky- 
leakin, Mr. Jeffreys. Scarborough, Lamlash Bay, Mr. Bean. Bos- 
ton ; March. 
3. Entosolenia lineata, nob. PI. II. fig. 18. 
Cell ovate, broadest towards the base, more or less truncated 
at the upper extremity, which is sometimes furnished with a very 
small projecting neck, of variable length, in which is the oral ? 
orifice ; once only I have found it equal to the entire length of 
the cell. The base, which is rounded, has generally appended to 
it a small mucro, which is sometimes affixed obliquely, and oc- 
casionally wholly wanting. Texture translucent, of a pale dull 
bluish white ; the surface covered with exceedingly numerous 
longitudinal lines, so fine as to be visible only under a good mi- 
croscope. Internal tube straight, patulous, reaching nearly to 
the base of the cell. 
The dull leaden hue of this species appears to be a constant 
characteristic ; I have usually been able to identify it at a glance 
from this feature alone. 
It is possible that the Vermiculum urnm of Montagu may have 
been a short stumpy specimen of this form. Montagu only 
saw a drawing of it. 
Long. Diam. 
TTJ • • • • HTT 
_ 1 _ _ 1 _ 
12 8 • • • • 2 00 
Sandwich, Mr. Jefireys. Boston; March: very rare. 
4. E. squamosa. PI. II. fig. 19. 
Vermiculum squamosum, Mont. p. 526. tab. 14. fig. 2. 
Serpula squamosa, Turt. p. 158. 
Lagenula squamosa, Flem. p. 235. 
Lagenula reticulata, MacGillivray, p. 28. 
