54 The Irish Naturalist. [March» 



Lsigena. Williamson I (Alcock)— Very common. 

 striata (d'Orb.)— Rare. 

 Ilneata (Will.)— Frequent. 

 scm istr lata Will. , — Common. 

 semllineata Wright,— One specimen. 

 squamosa (Moutg.)— Very common. 



var. lYIontagul (Alcock). PI. 2, fig. 2 a. b. 



This variety occurs very fine and in considerable numbers at Dog's 

 Bay. It differs from L. squamosa in being more globular, and frequently 

 more or less compressed or irregular in contour; the raised surface 

 reticulations are also very much smaller. I had given this variety a 

 MS. name, but now find that it had already been named Entosoknia 

 Montagiiihy V>r. Alcock in his "Natural History of Conuemara," but it 

 was not figured b}' him, and this is no doubt the reason that it came to 

 be overlooked; he thus describes it, "a squamous form but differs from 

 the named varieties of E. squamosa in having its surface really covered 

 with a pattern like scales instead of with raised reticulations. Well- 

 developed specimens are not at all flattened, though many are found as 

 if crushed, and they then present an appearance resembling a dried fig; 

 the true shape however is a perfect oval, full and well rounded at the 

 •mailer end, and from the middle of this projects a short smooth 

 cylindrical tube. With a low power of the microscope, the whole surface 

 of the body appears to be made up of small, almost square facets, 

 arranged in distinct longitudinal rows ; but when these are more highly 

 magnified each flattened surface is seen to rise a little anteriorl}^, and to 

 have the front border rounded so as to give exactly the appearance of a 

 covering of scales." Generally distributed around the Irish coast, but 

 much less common than L. sqiiafiiosa. 

 Lag'ena hexagrona (W^ill.)— Very common. 



laeviirata (Rss.)— Very rare. 



lucida (Will.) — Common, trigonal forms very rare. 



quadrlcostulata, Rss. —Very common, trigonal forms very 

 rare. 



marg^tnata C^V. & B.)— Frequent. 



orbIg:nyana (Seg.) — Very common, trigonal forms rare. 



clathrata, Br. — Rare. 



pulcheila, Br. — Frequent, trigonal forms very rare. 



fimbriata, Br.— Rare. 

 Nodosaria (Clandulina) rotundata, Rss.— Rare, surface marked 

 with fine longitudinal lines. 



pyrula, d'Orb — Very rare. 



communis, d'Orb. — Very rare. 



scalarls (Batsch.) — Frequent. 

 Cristcliaria rotulata (Lamk.)— Rare. 



crepidula (F. & M.) — Frequent. 

 Poiymorphina lactca (W. & J.) — Very common, a few large 



fistulose forms. 



var. amygrdaloldes, P. B. & J.— Rare, 

 var. oblong-a, Will.— Frequent. 



