ANATOMY AND PHYSIOLOGY. 
Moll. SI 
A rudimentary head with four tentacles, and a stomatogastric system 
have been found in Meleagrina margaritifera ; the latter consists of a 
cord passing from the brain and dividing into two branches, of which 
the anterior ends in a buccal ganglion, while the posterior forms a sort of 
jugular commissure, as in Haliotis. There is also an anal foliaceous oper- 
culum ; the ventricle of the heart is not traversed by the rectum, and the 
auricles are situated on its anterior aspect ; Mayoux. 
In Pliodon the labial palps are semi-lunar in form, and have a long 
straight attachment ; the gills divide the pallial chamber into two quite 
l/ distinct spaces. The //ntorior spaces communicate with the exterior by 
f two orifices, so that there are three openings into the mantle-cavity — 
pedal, branchial, and anal. The pericardial gland is very large ; the 
muscles of the mantle aud foot are described in detail ; Pelseneer, (4) 
pp. 116-128. 
Simpson (1) gives an elementary, but full description of the anatomy 
of Anodonta Jluviatilis, which is profusely illustrated by well-executed 
plates. 
Lepidomenia, n. g., for L. hystrix, n. sp. A unique specimen, 2 mm. 
long, was found in the Gulf of Marseilles, at a depth of 30 metres. It 
resembles Proncomenia internally, but has a spicular outer covering. The 
hypoderm is thick, and contains large brown cells (glandular ?) ; poste- 
riorly it is modified into a sensory pit, like that found in Proneomenia. 
Anteriorly is a pedal groove with glands. Within are muscular bundles, 
apd the general cavity is occupied by a connective tissue. The heart is 
the only well-differentiated organ ; it is situated posteriorly in a largo 
poricardium, which givos off two simple nophridial tubos, surroundod by 
a cellular excretory mass. These unite below the rectum into a single 
tube, which fuses with the latter to form a common cloaca, which has no 
gills, as in Proneomenia. The animal was not sexually mature. The 
digestive tract opens by a pharynx, with large internal tactile papillae and 
buccal glands. There is a radula of 8 strong teeth, two of which have 
• 6 teeth each ; there are also 8 reserve teeth ; near this are the salivary 
glands. The intestine has a little dorsal caecum, and then passes on to 
the rectum; there is a dorsal ciliated tract internally, but the greater 
part is lined with clavate digestive cells, which disappear towards the 
rectum. There is a large cerebrum, anterior to the radula, and an oeso- 
phageal collar ; two large pedal ganglia below and anterior to the radula, 
united by a commissure, and a posterior ganglion on the pedal trunks; 
there is no sublingual commissure forming a second oesophageal collar ; 
Marion & Kowalewsky. 
1 . Shelly Integument , and Connective Tissue. 
Hairs on certain species of Helix discussed ; Jeffery. 
Albino examples of Avion bourguignati ; Simkoth, (2) p. 340. 
The interbranchial web and dorsal cartilage of Cirroteutliis are de- 
scribed by Hoyle, (1) pp. 58. 
Suckers of Inioteuthis morsei described ; id. t. c. p. 114. 
1. The phragmocone of the Belenmite grew by introssusception. 2. 
