OO GLOSSARY. 



Lenticular shaped like a bi-convex lens. 



Ligament the band uniting the two valves of pelecypods. 



Lunate shaped like a crescent. 



Maculated spotted. Malacology the science which treats of the mollusca. 



Mantle the external integument of the mollusca. 



Mesopodium the middle portion of the foot. 



Metapodium the posterior portion of the foot. Moniliform beaded. 



Monoecious having the sexes united in each individual. 



Monomyary having one adductor muscle. 



MonotOCardiac having a heart with one auricle. Mucronate abruptly pointed. 



Muricated covered with prickles. 



Myophore the shelf to which in certain species of bivalves the internal ligament 



is attached. 



Nacreous pearly. Nautiloid resembling the pearly nautilus in shape. 

 Normal usual ; according to rule. 



Nudibraucbiate having the breathing organs exposed. 

 Nucleated having a nucleus. 



Oblique -slanting. Oblong greater in length than in width. 

 Oboval oval, with the broad end towards the apex of the shell. 

 Obtuse blunt. Odontophore the lingual ribVm or radula. 

 Operculated having an operculum. 



Operculum the plate which closes the mouth in many univalves. 

 OpiSChobranchiate having the breathing organs behind the heart. 

 Osphradium the organ of smell, consisting of a modified portion of epithelium. 

 OtOCyst the organ of hearing, consisting of a small vesicle containing fluid secretion. 

 Otolith a concretion suspended in the otocyst. Ovate egg-shaped. 

 Oviparous producing eggs. Ovoid nearly elliptical. 

 OVQViviparous producing offspring by hatching the eggs, and retaining the young for 



a time within the parent's body. 



Pallial belonging to the mantle. Parapodium the lateral edge of the foot. 

 Paucispiral having only a few whorls. Pectinated toothed like a comb. 

 Pectinibranchiate having comb-like gills. Pelagic -pertaining to the ocean. 

 Periphery the widest part of the body whorl. 



PeriOStracum the outer covering of the shell. Peristome the margin of the mouth. 

 Pinnate feather-shaped. Plicata folded like a fan. 

 Polyplacophora a sub-order of amphineurans, containing those whose shells have 



many plates. 



Propodium the fore part of the foot. 



PrOSObranchiate having the breathing organ in front of the heart. 

 ProtObrancbiate having the simplest form of gill. 

 PtenOglOSSa a section of the Monotocardia, having a radula in which the outer teeth 



are largest. 



Pteropoda the class of mollusca having winged feet. 

 Pulmonate breathing by means of lungs. 



Pulmonobranchiate having gills like lungs. Pyriform pear-shaped. 

 RaclliglOSSa a section of the Monotocardia, having the teeth in sharp ridges. 

 Radula the chitinous band in the mouth and throat of gastropods. 

 Recurved bent backwards. Reticulated being of the pattern of network. 

 RhipidOglOSSa a section of the Diotocardia, having fan-shaped teeth. 

 Rotund rounded in outline. RufOUB of a reddish colour. 



