306 POLYZOA INFUNDIBULATA. 



Cornwall, on old bivalve shells, C. W. Peach. On shells dredged off 

 Sana Island, by G. C. Hyndman. 



Mr. Hassall says that the crust when dry is " brownish and glisten- 

 ing ;" but, in the specimens I refer to the species, it is greyish-white, 

 of an irregular shape, composed of cells, which, although contigu- 

 ous, are distinct and well defined : they are ovato-globose, nar- 

 rowed anteriorly, with thick, roughish, or subgranular even walls, the 

 aperture subquadrangular, with a prominent mucro in the centre of 

 the proximal margin, and four short and equal spines on the sides 

 and lower margin, which is rounded. Ovaries globular and roughish. 



In many specimens there are a series of very distinct punctures in 

 the space between the cells ; and in one or two I have found a per- 

 foration behind the oral mucro, which was probably the result of 

 accident. In old specimens the spines at the sides of the aperture 

 disappear more or less. The species is allied to Lep. simplex. 



7. L. HYNDMANNI, cells subglolular, contracted in front, the 

 aperture plain, rounded, with a deep sinus on the proximal 

 margin ; on the side of the cell a large hollow spinigerous pro- 

 cess. 



PLATE LIV. FIG. 6. 



Hob. On the inner surface of a much decayed valve of Pecten 

 opercularis, and on other bivalve shells, dredged at Sana Island,* 

 July 1841, by G. C. Hyndman. 



The crust formed by this rare and remarkable species is dull 

 white and undefined ; the cells are distinct, but contiguous, of a 

 medium size, subglobular, narrowed and somewhat raised anteriorly, 

 the back smooth and thickish, but the base of the cells, or the space 

 between them, is occasionally perforated with a series of punctures. 

 The aperture has a neat and deep sinus on the proximal side, and the 

 distal margin is plain and rounded. The stout short tubular process, 

 on the posterior side of the cell, is always very obvious, and there 

 issues from it a long slender bristle, which, however, is often broken 

 away ; and in a specimen on a Lima I can find no trace of it. Ova- 

 rian capsules proportionably small, globular, with a smooth surface. 



I have dedicated the species to a naturalist, resident in Belfast, 

 who has contributed some very interesting additions to our Fauna. 



* Sana or Sanda Island is off the S.E. of the Mull of Cantire, W. coast of Scot- 

 land. 



