The TRixorns FROAt Or S. Bock's Fapeditiox to Japax I '.'1 4. ;{!• 



(in conformity to wliicii it lias the ill Uv series witii fulldwinu; |5r |+2 

 (levelo])ed and is tiierefoi-e certainly deterniinable). — Tiie combs 

 occur more and more abundantly on larger specimens and. finally, 

 in full-grown specimens I'cac^h far out on tli(> distal parts of tlic ai'nis. 

 Usually a comb occurs on every seconti pinnule. — The late onto- 

 genetical occurrence of combs on distal pinnules probal)ly has a corre- 

 spondence in the phylogenetical e\"oIution and might stand in a certain 

 relation to an altered manner of li\'iiig and a different mode of catch- 

 ing the f(»o(l. a (|uesti(iii that 1 shall discuss in another coiuieclioii. 



Comantheria A. II. Ci.akk. 

 C. grandicalyx (I* II. Cviii'l 



Fig. 80, 31. 



Syn.: Aciinomctra iir<tu(hrnJi/.i- 1882 P. II. (J.vrpk.ntior Jdurii. Liiiii. Soc. 

 Vol. 16, p. 520. 



(.'oiiitinthcriu grandictdy.c 1912 A. 11 ('i,.u;iv ("riii. Iiid. Oc. p. 90; Smillisoii. 

 Mi.sr. ('oil. Vol. 60, N:o 10, p. 7; I9i:, .l.uirn. .Vcad. Sri. Vol. o, p. 214; 1918 

 Sibogu E.\p. Vol. 42 B, p. 4:5. 



From St. 52: 2 specimens. 



Sp. 1 Cd 10 mm. in diameter, the tlorsal surface very concave, 

 free dorsal pole 6 mm. 



C. ± LXXV 26 (D) 25 mm., 30—31 (V| 29—34 mm., in about 3 

 close whorls. I''' to 5"' segments shorter than long to cubical, (i"' to 



I F'' or 14"' a little longer than broad, the following segments decreas- 

 ing, L = - .i ' 2 X br. From the 20"' or 25"' segment a very weak 

 and indistinct dorsal spine. Opposing spine a little stronger. Termi- 

 nal claw rather coarse, somewhat longer than the penultimate segment. 



1 Bi' 1 almost concealed. I Brax low pentagonal F = ' •> X bi', the 

 distal nmrgins concave. 11 Br I basally united in pairs inside. Ill Br 1 

 and 2 and sometimes also Br 1 and 2 fused in pairs on the inner side. 



II Br:s:4 (3 + 4), 111 Br:s : 2 (1—2, a weak synartlnial tubercle), IV 

 Br:s : 4 (3 i 4). The components of the di\isioii series smooth. l>roail. 



