38 Moll 
VIIL Mollusca. 
[1907] 
Calculation of grades and deviations ; 
Galton, 265. 
Tables for computing probable errors ; 
Gibson, 281. 
Calculation of moments of a fre- 
quency distribution ; Sheppard, 588. 
Terminology. 
Shell sculpture Gastropoda ; “ Axial ” 
(in place of “ vertical ” or “longitu- 
dinal”), “paraxial,” “ protr active” 
“retractive” new terms; Dali, 176 
p. 141. 
Miscellanea. 
Pearl formation ; Steinhaus, 634 ; 
Ward, 717. 
Pearls, Haliotia, Pecten, Mytilus etc. ; 
Smith, 612. 
Specimen of Fiatulana perforating 
shell of Doainia ; Smith, 611. 
Animals mentioned in the “ Lusiadas ” 
of Camoes ; popular names ; Osorio, 
464. 
STRUCTURE. 2207 
General. 
.. General summary with respect to 
evolutionary changes ; Woodward, 744. 
Metaineric segmentation disc. ; Thiele, 
676. 
Serial metamerism, evidence of latent 
segmentation ; Marchand, 425. 
Metamerism, Aplacophora ; Thiele, 
676. 
Prosobranchia, Haliotia etc. ; Palmer, 
472. 
Trociiidae, etc. ; Fleure & Gettings, 
246. 
Volutidae, notes; Dali, 175. 
Halolimnic forms ; Pelseneer, 479. 
Sigaretua ; Bergh, 51. 
Marseniidae, Lamellariopsia (gen. n.), 
Maraeniopaia ; Vayssi&re, 695. 
Maraenia spp. ; Bergh, 51. 
Pulmonata, Epiphragmophara etc. ; 
Pilsbry, 484. 
Pulmonata reno-pericardial relation- 
ships in slugs ; Rolle, 545, 546. 
Oleacinidae, few notes ; Pilsbry, 483. 
Pulmonata, Vitrea ; Bowell, 85. 
Pulmonata, Khaaiella ; Godwin- 
Austen, 284. 
Pulmonata, Oncidiidae ; Stantschin- 
sky, 625. 
Opisthobranchia, S. African spp. ; 
Bergh, 51. 
Nudibranchia; Eliot, 231. 
Nudibranchia, Guy-V alvoria (gen. n.), 
Notaeolidia , Charcotia (gen. n.), etc. ; 
Vayssi&re, 695. 
Lamellibrancliia, Enaia, notes ; Drew, 
221 . 
Lamellibrancliia, Solecurtua ; Bloomer, 
59. 
w Lamellibrancliia, Tagelua ; Bloomer ; 
59. 
Lamellibranchiata, Aenigma etc. ; 
Bourne, 79. 
Ehodoplana [? Turbellaria] ; Vays- 
sifcre, 695. 
Arms of Belemnoidea ; Crick, 157. 
Tentacles, Nautilua, histology; Fer- 
nandez, 240. 
Siphon, Lutraria etc. ; Anthony, 17. 
Cilia; Williams, 734. 
Ihering, 347. 
Nervous System. 
Nervous system, homologies ; Thiele, 
676. 
Pecten ; Drew, 222. 
Ganglion cells, Tethya, histology; 
Merton, 443. 
Innervation, tentacles of Nautilua ; 
Fernandez, 240. 
Innervation dorsal eyes and aesthetes, 
Polyplacophora ; Nowikoff, 462. 
Cephalopoda ; Moreno, 446. 
Hofmann, 335, 336 ; Yung, 758. 
Sense Organs. 
Eye, degeneration in Planorbia 
magnificua ; Dali, 183. 
