12 1 1 ? MYRIOZOID^E. 



varieties; but the cell is identical in both*. The branches 

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

 as they lengthen. 



The avicularium of this species has been generally over- 

 looked, but is figured by Smitt. 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. Alderi that requires any 

 special notice. 



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

 zoo3cium. 



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



ESCHARA VUUJAKIS, Moll, Seerinde, 55, pi. iii. fig. 10. 



ESCIIARINA VULGAHIS, Lamk. An. B. V. ed. 2, ii. 231 (excl. syn. E. Dutertrn). 



CELLEPORA VULOARIS, Lamx. Pol. Cor. flex. 94. 



LEPRALIA VULGARIS, Btisk, Quart. Journ. Micr. So. vi. 127, pi. rviii. flg. 3 : 



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



eer. 3, ix. 203. 



LEPRALIA ALBA, Hincks, Quart. Journ. Micr. Sc. viii. 275, pi. m. figs. 2, 2 a. 

 CELLEPORA OTOPHORA, Beuss, Polyp, d. Wiener Tertiarbeckens, 90, pL xi. 



fig. 1. 

 LKPRALIA OTOPHOHA, id. Sitz. d. kais. Ak. d. Wissensch. Bd. L. 25, pi. xv. 



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

 ? LEPRALIA COONATA, Reuss, Bryoz. d. deutach. Septar. 62, pi. vii. flg. 5. 



* We have similar varieties in Phylactdla labrosa, Busk, and Mcmbrani- 

 pora monostachyt, id. 



