276 ZOOPHYTOLOGY. 



Ovicell small, depressed, closely united to the cell above, surface finely 

 granular. 



On shell, coast of Antrim. 



2. L. eximia, n. sp., Hincks. Plate XXX, figs. 3, 3 a. 



Cells large, ovate, distinct, granular, punctured round the margin ; mouth 

 sub-quadrate, with a raised peristome, rising into a point at each side, a 

 broad, rounded denticle within the lower margin. Ovicell globose, promi- 

 nent, punctured. 



This fine species grows in irregular, lobulate patches. My 

 specimens exhibit neither spines nor avicularia. 



On shell, coast of Antrim. 



3. L. discoidea, Bk. Plate XXX, figs. 4, 4 a. 



Cells in straight radiating series ; immersed at the base, sub-erect above; 

 surface punctured frosted ; orifice small, suborbicular, with a sinus below, 

 peristome raised ; 4 to 6 marginal spines above ; an avicularium on one or 

 both sides of the cell ; mandible elongated linear, obtuse, directed down- 

 wards and outwards. Ovicell recumbent, punctured, its sides prolonged, so 

 as to surround the mouth. 



Bab. — Antrim, on shell, T. Jlincks ; Madeira, /. Y. Johnson ; Shetland, 

 Barlee. 



This species has been figured twice already in former parts 

 of Zoophytology, but on both occasions from specimens in 

 which the true characters were not displayed. 



An amended character, therefore, and a more correct 

 representation of the perfect form, is now given. Having 

 been furnished by Mr. Busk with specimens of the same 

 species, recently received by him from Madeira, through the 

 kindness of Mr. J. Y. Johnson, I am fully satisfied of the 

 identity of the Madeiran and Irish forms. 



The characters above assigned are usually to be found 

 only on the marginal cells of the patch, which are also in 

 many cases double the size of the older or more central 

 cells ; in the latter also the peculiar avicularia are almost 

 invariably wanting, being replaced in most instances by a 

 single, smaller, imperfect avicularium, placed rather to one 

 side on the front of the cell immediately below the mouth. 

 But it is very often the case that this organ is wholly want- 

 ing, when the species presents the aspect under which it was 

 formerly depicted. 



4. L. Woodiana, Busk. 



This species has been lately described and figured by Mr. 

 Busk in his ' Monograph on the Polyzoa of the Crag* 

 (p. 42, pi. vii, figs. 1 and 3), and was only known as a fossil, 

 previous to its occurrence amongst Mr. Ilvmlnian's Antrim 

 dredgings. From this rich material I have obtained one or 



