Discovery reports (1954) Discovery reports discoveryreports26inst Year: 1954 -'. f> -'*â â Figs- 3'7- Errinopsis reticulum from St. WS 246. (3) Part of the surface of a branch; near the brim of the central gastropore three ' spines' are seated, the lumpy one with two grooves or conduits from base to summit. (4) Lateral part of a branchlet with full-grown and developing spines. (5) Gastropore from the fracture of a branch showing the entire gastrostyle in side view. (6) Gastropolyp in situ drawn on basis of two slides. (7) Gastropolyp prepared out. (1), (2) and (3) after skeleton having
Discovery reports (1954) Discovery reports discoveryreports26inst Year: 1954 -'. f> -'*â â Figs- 3'7- Errinopsis reticulum from St. WS 246. (3) Part of the surface of a branch; near the brim of the central gastropore three ' spines' are seated, the lumpy one with two grooves or conduits from base to summit. (4) Lateral part of a branchlet with full-grown and developing spines. (5) Gastropore from the fracture of a branch showing the entire gastrostyle in side view. (6) Gastropolyp in situ drawn on basis of two slides. (7) Gastropolyp prepared out. (1), (2) and (3) after skeleton having been cleaned with sodium hypochlorite; (4) and (5) from decalcified fragments. (1) x 40; (2>-(s) x °°- developed from, spineless pores by growth of the surrounding coenosteum (Fig. 4). The growth is not symmetrical, but at first results in a spine with an obliquely placed, oval pore-opening. In many cases the apical part of the spine grows far above the pore, so that this becomes an oval opening or slit on the side of a conical spine. In other cases the pore continues as a groove or narrow conduit to the very top of the spine. Again, two or three pores may debouch on one spine, and here one may be round, the other more groove-like. In Fig. 3 the lumpy spine is furnished with two grooves, both of which run conduit-like to the very summit of the ' spine'. A careful examination of the coenosteum alone does not furnish a safe basis for determining whether the dactylopores exhibit real dimorphism. This question can only be settled by examination of the soft parts of the colony. The dactylozooids are throughout simply finger-shaped without any specially developed basal adhesive part; they agree entirely with the smaller dactylozooids of E. antarctica (Fig. 1). The uni-
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