140 



THE SCALLOP FISHERY 



Fecundation, 

 Fertilization, 

 Flagellum, . 

 Follicle, 

 Formative cells, . 



Ganglion, 

 Gastrula, 



Genus, 

 Geotropic, . 

 Germ cell, . 

 Gills, . 



Gland, 



Hermaphrodite, 



Invagination, 



Lamella, 

 Lamellibranchiata, 



Larva, 



Lumen, 

 Macromere, 



Micromere, . 

 Mantle, 



Mantle cavity, 

 Maturation, 



Migration, . 

 Monomyarian, 



Nacreous structure, 



Nucleoli, 



Nucleus, 



Otocysts, 



Ovary, 



Ovum, 

 Pecten, 

 Pericardium, 

 Posterior, . 



Impregnation of the ovum by the spermatozoon. 



Fecundation. 



A long, whip-like cilium. 



A small cavity. 



Cells which form the animal in contrast with cells 



which furnish them with food. 

 A mass of grey nervous substance, which serves 



as a center of nervous influence. 

 An embryonic stage which has the form of a 



double-walled sac with an opening leading into 



a cavity, the archenteron. 

 Group of species. 



Showing a disposition to incline toward the earth. 

 That which is to develop a new individual. 

 Eespiratory organs in water, comparable to the 



lungs in air. 

 . , A cell or collection of cells having the power of 



secreting. 

 An animal having both male and female generative 



organs. 

 One of the methods by which the various germinal 



layers of the ovum are differentiated. 

 A thin plate or scale. 

 Animals of the mollusk family that have the gills 



arranged in leaf -like layers. 

 The animal during its development until it reaches 



adult size. 



An opening, space or cavity. 



One of the larger cells, resulting from segmen- 

 tation of the egg. 



One of the smaller cells, resulting from segmen- 

 tation of the egg. 

 The fleshy, membraneous covering, lining inside of 



the shell. 



The space between the mantles. 

 The process of ripening or coming to maturity of 



the egg. 



Act of traveling from one region to another. 

 Having one adductor muscle, as with the scallop 



and oyster. 



Pearly layer of shell, generally on the inside. 

 Smaller divisions or parts of the nucleus. 

 Germinative spot. 

 Organs of equilibration. 

 The organ of a female in which the eggs are 



formed. 

 The egg. 



Scientific name of the scallop. 

 Membrane inclosing the heart. 

 Opposite to anterior. 



