ANATOMY AND PHYSIOLOGY. 
Molt 39 
Sense organs like those of Chitons have been found in the shells of 
many Gastropods and Peleoypods ; eyes of Trigonia resemble the omma- 
tidia of Insects. Sense organs, seemingly visual, described in the mantle 
of Siphonaria; Tenison-Woods (1). 
An inversion of the retina has probably taken place in the cases of 
Onchidium and Pecten ; Mark. 
The so-called eyes of Tridacna are not visual organs ; possibly they are 
phosphorescent; their structure is described ; Brock (2). 
The siphon of Pholas dactylus expands in the dark, but contracts imme- 
diately under the influence of light, even after removal from the animal. 
The time required for this action under different kinds of light has been 
examined ; Dubois (3). 
The otocysts of Mur ex described by Haller are accessory salivary 
glands ; Bouvier (3). 
Right rhinophore of Triopa clavigera formed of three branches ; 
Fischer (2). 
Notes on olfactory organ of several Cephalopoda ; Weiss, pp. 88 & 89. 
Tentacular filaments in Ilaliotis are always threo in number ; 
Smith (2). 
9. Generative Organs . 
The recent literature on the development of the generative organs of 
Gastropods is summarised and criticised ; Schiemenz. 
Examination of Lymnceus supports, on the whole, the views of Brock 
and Rouzaud as to the development of the generative organs ; Eisig said 
to have been mistakeu in numerous points ; Klotz. 
Remarks on Limncea ; Williams (5). 
In Aplysia fasciata the hermaphrodite gland contained only sperma- 
tozoa; the capillaries open into lacunas; the purple gland is active in 
purifying the blood ; the hermaphroditism is not absolute, but there is a 
physiological separation of the sexes at different times ; Saint-Loup. 
Hermaphroditism of Valvata piscinalis ; Garnault (4, 6). 
Generative apparatus of Helix faustina and 11. rossmavsleri figured ; 
Brancsik (1). 
In Ampullaria the ovary is not situated at the extremity of the spiral, 
but embedded in a large whitish albumen gland. The duct is approxi- 
mated to the rectum, and opens below and a little behind the anus. The 
male gland is situated in the place usually occupied by the female ; its 
duct is rather large, and opens upon the same process as the female duct. 
A case of hermaphroditism was observed in which separate male and 
female glands were present, an arrangement quite distinct from the her- 
maphroditism of the Pulmonata and Qpisthobranchiata ; Bouvier (2, 5). 
Further investigation on species of Vitrina , and especially on the darts, 
detailed ; Simrotii (1). 
Two kinds of spermatozoa, spiriform and filiform, are described in 
Eledone. Observations on these confirm the author’s previous state- 
ment that the vermiform spermatozoa of Paludina are colonies ; 
Sabatier. 
