. t t' w Fig. 22. lophonproximum (Ridley): showing variation in ends of tornota. a, I. chelifer ostia-magna, Wilson (type); b, I. chelifer, Ridley and Dendy (co-type: 87. 5. 2. 157); c, /. chelifer, Ridley and Dendy (type); d, I. chelifer, Ridley and Dendy (Lambe's specimen); e, G iog\f, I. indentatus, Wilson (type); », /. lamella indivisus, Wilson (type); /;, /. lamella, Wilson (type); i, I. pattersoni (Bowerbank), Ridley and Dendy (Challenger Sts. 308 and 3ii);y, /. chelifer, Ridley and Dendy (Thiele's specimen); k, D 255; l-l", D256; m, D 251; n, D739; 0, D 740; p, D 257; q, D 254
. t t' w Fig. 22. lophonproximum (Ridley): showing variation in ends of tornota. a, I. chelifer ostia-magna, Wilson (type); b, I. chelifer, Ridley and Dendy (co-type: 87. 5. 2. 157); c, /. chelifer, Ridley and Dendy (type); d, I. chelifer, Ridley and Dendy (Lambe's specimen); e, G iog\f, I. indentatus, Wilson (type); », /. lamella indivisus, Wilson (type); /;, /. lamella, Wilson (type); i, I. pattersoni (Bowerbank), Ridley and Dendy (Challenger Sts. 308 and 3ii);y, /. chelifer, Ridley and Dendy (Thiele's specimen); k, D 255; l-l", D256; m, D 251; n, D739; 0, D 740; p, D 257; q, D 254, D 258; r, D431; s, D 252 ;<,/',£) 837; u, D 430; v, Alebion proximum, Ridley (type); ro, lophon proximus (Ridley), var. reticularis, Hentschel. All figures x 1200. Figs. a,f,g,h after Wilson; fig. d after Lambe; fig. j after Thiele. Fig. w from a preparation from the type. specimens with a single species. Some of the variations can be correlated, but only vaguely, with increase in size, but nowhere is there so clearly marked a sequence as I have described (1930) in /. radiotus, Topsent. For example, with increase in size the specimen tends to become flabellate, either erect or spreading over the substratum; generally, the average size of the main acanthostyli and the tornota tends to increase, but the tendency is not well marked; the dermal skeleton is regular in young encrusting individuals and becomes more diffuse and irregular in the larger forms, but is never lost; and the bi- pocilla tend to become trifoliate (or bifoliate) as the specimen increases in size. Other interesting features of the skeleton are: (i) the frequency with which the
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