1. DlSCOrORELLA. -'U 



DiscoporeUa Jitspida when fresh and uninjured the peristome is 

 produced as in the other Discoporellce, and usually divided into from 

 2-4 delicate aculeate spines. 



Dr. Johnston, aud probably most other writers, appear to have 

 confounded D.Jiispida, as here understood, with D. verrucaria, Linn. 

 These two forms, however, can be at once distinguished by the larger 

 size of the zoooecial cells in the latter, in which also they are 

 arranged more or less regularly in radiating lines, and by the peri- 

 stome being usually bifid or simply acuminate. 



2. DiscoporeUa verrucaria, Fab. (Linn.). (Plate XXVIII. figs. 2, 3). 



Zoarium discoid, hemispherical or subconical ; ceUs towards the 

 centre elongated and frequently arranged in radiating lines, and 

 quincuncially toward the periphery ; peristome simply acuminate or 

 bifid (rarely trifid). 



Tubulipora hispida (pars), Johnston, I. c. p. 268 ; Fleming. 

 Madi-epora ven-ucai-ia {Linn. ?), Fabric. Faun. Grcenl. p. 430. 

 ? Discosparsa liispida, Heller. 



DiscoporeUa veiTucaria, Smitt, I. c. p. 405, pi. x. figs. 6-8, pi. xi. 

 figs. 1-6. 



Hah. Orkney (Barlee) ; Arran ; Hamilton's Inlet, Labrador, 

 Rekiavic, Greenland, 10-20 fathoms ( Wallich) ; Assistance Bay, 

 Greenland, 74° 50' N., 94° 16' W. (H.M.S. ' Sophia,' Dr. Sutherland) ; 

 coast of Norway {Loven)x Spitzbergen (Smitt). On Fucus. 



Prof. Smitt gives Mr. Hiucks's D.JIoscidus as a synonym; but the 

 two appear to me to be quite distinct. 



3. DiscoporeUa algoensis, n. sp. (Plate XXVIII. figs. 1,4.) 



Discoid ; cells disposed in radiating uniserial lines, mouth ellip- 

 tical, lower side of peristome produced into an acuminate point. 

 Interstitial pores small, sparse. 



Bab. Algoa Bay, on Catenicella. 



The peculiar way in which the mouths of the cells are bevelled 

 off' on the upperside is very distinctive of this species. In aU other 

 cases that have come under my notice the bevelling is on the lower 

 side of the mouth. 



4. DiscoporeUa ciUata, n. sp. (Plate XXX. fig. 6.) 



Discoid ; ceUs uniserial, 4-6 in each row ; diameter of mouth less 

 than that of the interstitial eanceUi ; peristome much produced on 

 one side, nearly vertical, divided into several (2-4) long acute, 

 slender spines. 



Hah. Cape of Good Hope, on Retepora (Tumanovjicz) ; New Zea- 

 land, on Hornera (Dr. Lyall). 



The upright, half-tubular, aculeated peristome and the very large 

 size of the angular cancelli are very characteristic. The figure of 



