NORMAN, ON RARE BRITISH POLYZOA. 221 



EscHARA QuiNCUNCiALis, Normaii. PI. VII, figs. 1 — 3. 



Eschara quincuncialis . Rep. of tlie Brit. Assoc. 1866(1867). 



Report, p. 204. 



Pohjzoarij white, smooth, polished, cyHndrical. Cells 

 distant in linear series, regularly arranged in quincunx 

 round an imaginary axis, swollen, mammaeform; mouth 

 key-hole shaped, rounded ahove, with a small sinus belo'SA", 

 and a small inconspicuous avicularium on the margin. 

 Ovicell small, with 1 — 4 round perforations. 



The type specunen is apparently a mere fragment, and is 

 not more than a quarter of an inch long. It is, however, 

 clearly distinct from all the allied species with which we are 

 acquainted. It was dredged by Mr. JeiFreys and myself in 

 1866 in deep water in the Mincli. 



Hemeschara struma, n. sp. PI. YII, figs. 6 — 8. 



Polyzoary sometimes encrusting stones, at others creeping 

 over Porella cervicornis, and stretching from branch to 

 branch of that coral, in both cases rising here and there 

 into free frill-like expansions ; y^ellowish, glistening. Cells 

 immersed, quincuncially arranged, obovate ; throat greatly 

 swollen (goitre-like), surface channelled with irregular 

 depressions, which, however, round the edge assume the form 

 of wedge-shaped foveolae ; a rounded avicularium just within 

 the lower lip ; mouth broader than high, upper and lower lips 

 simple, well arched, meeting at a point at the sides. Ovicell 

 semicircular, not much raised (about equal in elevation to 

 the goitre-formed throat), surface uneven, not punctate. 



The more mature cells are seen to be separated from each 

 other by a raised line, and the marginal foveolae become 

 much more distinct. The figures are taken from young 

 cells. 



The cells of tliis species are, in their general character, 

 very like those of L. conclnna ; they are, however, consider- 

 ably larger than in that species, and the surface is chaimelled 

 with foveolse, instead of being rOugh and granulated ; the 

 mouth is also of different form, and broader than long, in- 

 stead of the reverse. 



Dredged in 100 fathoms about twenty-five miles north of 

 the Island of Unst, the most northern of the Shetland group. 

 It is very rare, and the specmiens obtained are small, the 

 free expansions not exceeding half an inch high, and con- 

 sisting of a single series of cells. 



