244 MYRIOZOIDiE. 



varieties; but the cell is identical in botli^. The branches 

 originate in pairs from the top of a cell, diverging gradually 

 as they lengthen. 



The aviculariu.m of this species has been generally over- 

 looked^ but is figured by Sniitt. It is very sparingly de- 

 veloped. When it occurs, it is usually single ; but occa- 

 sionally there is one on each side of the cell. Beyond 

 the superficial differences, dependent principally on age, 

 there is no further variation in S. Alder i that requires any 

 special notice. 



There is a row of large punctures round the base of the 

 zooecium. 



Habitat. On stones,, shells, &c., from deep water. 



Locality. Shetland, common, 50-170 fms. (A. M. N.). 



Geographical Distribution. Hammerfest, 40-60 

 fathoms (Loven) : Bergen (A.M.N.) : Southern Norway, 

 on Astarte (Dr. Boeck). 



SCHIZOPORELLA VULGARIS, Moll. 



Plate XXXVII. fig. 7, and Plate XV. figs. 5, 6. 



EscHARA VULGARIS, Moll, Seei'inde, 55, pi. iii. fig. 10. 



EsCHARixA vuLGAiiis, Lamk. An. s. V. ed. 2, ii. 231 (excl. syn. E. Dutertrei). 



Cellepora vulgaris, Lamx. Pol. Cor. flex. 94. 



Lepralia vulgaris, Busk, Quart. Journ. Micr. So. vi. 127, pi. xviii. fig. 3 : 



Hincks, Devon & Cornw. Cat. 43 (sep.) ; Ann. Nat. Hist. 



ser. 3, ix. 203. 

 Lepralia alba, Hincks, Quart. Journ. Micr. Sc. viii. 275, pi. xxx. figs. 2, 2 a. 

 Cellepora otophora, Eeuss, Polyp, d. Wiener Tertiarbeekens, 90, pi. xi. 



fig. 1. 

 Lepralia oxoriioRA, id. Sitz. d. kais. Ak. d. Wissensch. Ed. L. 25, pi. xv. 



fig. 1 ; Bryoz. d. deutsch. Septar. 62 (sep, ), pi. vii. fig. 4. 

 ? Lepralia cognata, Eeuss, Bryoz. d. deutsch. Septar. 62, pi. vii. fig. 5. 



* We liave similar varieties in Phylactella lahrosa, Busk, and Membrani- 

 fora raonosiachys, id. 



