Fig. 6. 
14. 
15. 
16. 
17. 
18. 
I), 
or pe 
fer) 
-1 
BRYOZOA FROM FRANZ-JOSEF LAND. 103 
Porella inflata, nom. noy.; X 25. From between Cape Fiora and 
Cape Gertrude, 30 fath. 
. Do. Mandible, x 250. 
. Porella saccata, Busk; X 25. From near Wilczek Land, 127 fath. 
Section showing the position of the oral glands (g/), which are 
behind the tentacles so that they are not seen in the zoccia cut 
through near the frontal surface ; 0v, ovum. X 25. 
. Do. Transverse section showing the large oral glands (g/), the avicu- 
arian sheath (av), the tentacles (¢), in their sheath, cesophagus 
(@), cecum (¢), testes (fe). x 50. 
. Do. Oral gland, x 250. In the upper part the cells are partly 
absorbed. 
. Porella saccata, B. (elegantula, B.). Mandible, x 85. Off Nova 
Scotia (‘ Challenger ’). 
. Do. Mandible, x 85. Near Wilezek Land. 
13. 
Porella elegantula, VOrb. (perpusilla, Busk). Mandible, x 85. 
Newfoundland. From d’Orbigny's type-specimen No. 13622, Mus. 
Nat. Paris. 
Porella saccata, Busk; * 25. Specimen boiled in caustic potash, 
showing the large avicularian chambers, that of the left zocecium 
has been broken away, also showing the pores at the base of the 
avicularian chambers. From near Wilczek Land, 127 fathoms. 
Do. Operculum, x 85. 
Do. Mandible, x 250. 
Do. Diagrammatic section, showing the frontal pore connected 
through a rosette-plate with the avicularian chamber, which farther 
down is similarly connected with the zoccium.  (ov.) ovicell, 
(av. ch.) avicularian chamber, (z. ch.) zocecial chamber, (mm.) man- 
dible, (op.) operculum. 
Porella elegantula, VOrb. Operculum, x 85. 
Do. From the original specimen No. 18622, showing the gigantic 
avicularia on the left, and pores on the front similar to those of 
P. saccata, Busk. 
Puate LI. 
. Porella elegantula, Orb. Specimen from Newfoundland named 
Eschara elegantula by d’Orbigny, No. 13622 in the Musée d’Histoire 
Naturelle. This is only a reproduction of a rough sketch made as a 
memorandum of the way in which the specimen grew. Nat. size. 
. The Eschara pavonina of dOrbigny, Ile de Ré (Pal. Fr. vol. v. p. 101. 
No. 18621, Mus. d’Hist. Nat.). 
. Porelia compressa, Sowerby. Operculum, x 85. British specimen. 
. Do. Mandible, x 250. British specimen. Identical with Arctic. 
. Do. Calcareous section showing the position of the pore-tubes, x 25. 
Off Cape Mary Harmsworth. 
. Porella Skenei, var. tridens, Kirch. Operculum, x 85, Lat, 
77° 55’ N., long. 53° 20’ E. 
. Do. Mandibles, x 250. 
