BIOLOGY. 
Moll . 33 
6. Respiratory System. 
For important notes concerning the structure of the gills of Pclecy- 
poda as employed for purposes of classification, see Dall (104, 105, under 
Euciroa , &c.). — Respiratory exchange in Mollusca ; Yernon (462). — Air- 
breathing Prosobranchs and branchiated Pulmonates ; Pelseneer (318). 
7. Excretory and Secretory Systems. 
On the kidney in the larval Basommatophora ; Erlanger (135). — 
Organs of Bojanus in Sphccrium rivicola ; Tocl (441). — Observations on 
the Byssus of Pelecypoda ; Boutan (40). — Mode of fixation of Pelecy- 
poda by the Byssus ; Boutan (39). 
8. Nervous System. 
Central nervous system of Eledone rnoschata ; Uexkull (450). — Notes 
on the optic ganglion of Cephalopoda ; Kopsch (235), the Ceplialopod 
retina corresponds to the rods and cones only of the vertebrate retina. — 
Nervous system of Phyllohranchus borgninii ; Trincuese (447). — Central 
nervous system of Dreissensia polymorpha is shown by Babor (15) to 
exhibit well-developed parietal ganglia. 
9. Sensory System. 
Notes on the retina of Cephalopoda ; Grenaciier (167). — Function of 
the osphradium; Pelseneer (315). — Researches into the olfactory organ 
of Bulla ; Mazzarelli (275). 
10. Generative System. 
Hermaphroditism in the Mollusca is a secondary condition, and grafted 
on the fomalo ; Pelseneer (317). — Genitalia of Umax he.dle.yi , n. sp. ; 
Collinge (81). — Genitalia of Auricula ; Pelseneer (316). — Semenal 
elements of Paludiua ■ vivtpara ; Auerbach (14). — Genitalia of Unionida \ 
notes with reference to classification ; Sterki (416). 
11. Embryology. 
Fry of Oppelia withaptychi; Michael (282).— Development of Slylom- 
matophora ; Schmidt (367). — Early development of Limax ; Kofoid 
(233). — Mesoderm formation in Siphonaria lepida ; Fujita (145). — Early 
stages of the development of Pholadidce ; Sigerfoos (372). — Develop- 
ment of Scioberetia australis ; Bernard (27). — Embryology of the 
Unionidaz ; Lillie (244). — Philobrya passes through a Glochidium stage ; 
Dall (104) p. 487.— Di-myarian stage of “Native” Oyster; Webb (476). 
—Development of European Oyster; Woodward (491). 
1895. [vol. xxx ii.] D 9 
