BIOLOGY. 
Moll 35 
Pearl oyster; Herdman (231). — On spermatogenesis in the Cephalopoda; 
Thesing (253). — Maturation of the egg in Mollusca; Lubosch (323). — On 
the ripening and fructification of the egg in Cymbulia peronii ; Nekrassoff 
( 365). — Spermatogenesis in Helix pomatia ; Prowazek (434). — Develop- 
ment of Trochidce\ Robert (444). — Nest and eggs of Limax flams ; 
Roebuck, Naturalist 1903, p. 319. — On the development of abnormal 
spermatic bodies in Cerithium vulgatum and Nassa mutabilis ; Stephan 
( 503). — Embryology of Unionidce ; Sterki (507). — The early stages of 
development in the Cephalopoda ; Teichmann (525). 
The period of sexual differentiation in the hermaphrodite gland in 
Limax maximus ; Ancel (8). — Byssus in young Unionidce ; Frierson (187). 
— On the formation of “purple” in Purpura lapillus ; Letellier (314). — 
The development of the radula in the Gastropoda ; Schnabel (465). — 
Oligopyrene and Apyrene sperm in some Prosobranchs ; Stephan (501, 
502). 
4. Ethology (Habits, Relation to Environment, &c.) 
Mucous threads of Limax ; Ballerstedt (25). — Adaptation of non- 
marine molluscs to changed conditions ; Billups (42). — Freshwater 
Molluscs spinning threads; Brenner (66). — Note pn the perforation of 
rocks by Lithodomus ; Carazzi (79 ). — Vitrina depositing eggs; Clapp 
( 95). — Food of Microparmarion ; Collinge (106). — On the utilisation by 
Mollusca of the calcareous salts in water; Domet de Vorges (147). — 
Curious habitat for Neritina flumatilis ; Giard (204). — Habits of Acantho- 
pleura granulata ; Hamilton (220). — Habits of Venus mercenaria ; Kel- 
logg (269). — Entosiplion , a new genus of parasitic Mollusca found in a 
Holothurian ; Koehler & Vaney (300). — On the locomotion of Limacidce\ 
Kunkel (302). — Habits of Unio margaritifer ; Letacq (313). — Habits of 
Helices; Madoul^ (328). — .Estivation of Ancylus] Nordensktold (370). 
— Respiratory and locomotory habits of Ampullaria globosa; Ram an an 
( 436). — Mode of existence of Orthoceras, &c. ; Ruedemann (453). — -Habits 
of Vitrina baring oensis \ Smith, P. Malac. Soc. London v, p. 310. — Fistu- 
lana clava piercing Mitra ; Sowerby & Fulton (493). — Habits of Helix 
pomatia ; Spiess (494). — Uses of muscles in Molluscs; Steinhaus (499). 
— Olfactory sense in Gastropods; Yung (585). — Olfactory sense in Helix 
pomatia ; Yung (586). 
Pearls and their formation : — Origin of pearls ; Boutan (63). — Artificial 
production of pearls; Dubois (156, 157). — Formation of pearls in Mytilus\ 
Dubois (155). — Origin and formation of pearls ; Giard (201-3). — Pearl 
Oyster and formation of pearls; Herdman (229-231). — Frequency of 
pearls in Mytilus edulis ; MTntosh (327). — Pearl production in Unio 
pseudolitoralis ; Anon. (17). — Verv large pearl; Anon., Nautilus xvii, 
p. 72. 
5. Variation and Teratology. 
Malformed specimen of Ceratisolen legumen\ Bloomer (55). — Variation 
of colour of foot-fringe of Arion empiricorum\ Collinge (106). — Bifid 
tentacle in Nacclla cenea; Pelseneer (391). 
Variation of ribbing in Cardium\ Baker (23). — Erosion and variation 
in Littorina; Bigelow & Rathbun (41). — Sinistral Polygyra profundd; 
Billups, Nautilus xvi, p. 119. — Sinistral Mesodon exoleta ; Call, Nautilus 
xvi, p. 119. — Variation in Ashmunella ; Cockerell (104). — Variation of 
Peeten ; Davenport (139). — Sinistral Helix rotundata ; Jackson, J. Conch, 
x, p. 284. — Variation in Polygyra ; PilsbRy (411). — Abnormal shell of 
Argonauta argo; Smith (480). — Monstrosity of Rissoia parva; Sykes 
(513). 
