. Bulletin of the British Museum (Natural History). Tremogasterina robusta (Hincks) Lepralia robusta Hincks, 1884 : 360, pi. 13, fig. 4. Tremogasterina robusta (Hincks), Powell & Cook, 1967 : 12, pi. 1, figs c, d, text-figs \-\. Powell, 1967 : 166. Material examined. In addition to that listed by Powell & Cook, 1967 (see Appendix, p. 143). BMNH, Perin Is, Aden, and , 15 metres. Gulf of Oman, , 18 metres. ? Pleistocene, Givan Peninsula, Red Sea, Reef Limestone, BMNH L51638, , on Saccoslrea of. cucullala (Born). Description (Pis 5E, SB, C, F
. Bulletin of the British Museum (Natural History). Tremogasterina robusta (Hincks) Lepralia robusta Hincks, 1884 : 360, pi. 13, fig. 4. Tremogasterina robusta (Hincks), Powell & Cook, 1967 : 12, pi. 1, figs c, d, text-figs \-\. Powell, 1967 : 166. Material examined. In addition to that listed by Powell & Cook, 1967 (see Appendix, p. 143). BMNH, Perin Is, Aden, and , 15 metres. Gulf of Oman, , 18 metres. ? Pleistocene, Givan Peninsula, Red Sea, Reef Limestone, BMNH L51638, , on Saccoslrea of. cucullala (Born). Description (Pis 5E, SB, C, Fig. ID). Colony encrusting oyster shell and coral, zooids very large. Orifice with lateral indentations and condyles and two (occasionally three) spines. One to three frontal foramina, frequently only one present, tripartite at first, often occluded early in ontogeny. Avicularia large, with asymmetrically curved, slightly spathulate or acute mandibles, orientated distally. Vicarious avicularia rare. Brood chambers not prominent. Measurements (in mm). LzO-60-1-20 LoO-24-0-30 LovO-20-0-30 Lr 0-40-0-70 Iz 0-40-0-65 lo 016-0-20 lov 0-30-0-40 Lvic 0-40-0-60. Fig. 7 T. oranensis (Waters) and T. brancoensis (Gal vet). Correlation of orifice shape with avicularium size, shape and orientation; showing distinction in character states between the two 'typical' northern populations of both species, and convergence of states with progressive southerly distribu- tion, (o) T. oranensis; (b) T. brancoensis. 133. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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