482 THE PINEAL ORGAN 



Balanoglossus (Gr. balanos, acorn ; glossa, tongue) : a worm-like animal, 

 having a tongue-like proboscis and rudimentary notochord, belonging 

 to the class Hemichorda, of the Protochordata. The larval form, or 

 Tornaria, closely resembles the trochophore larvae of certain 

 invertebrates. 



Bdellostoma (Gr. bdella, leech ; stoma, mouth) : a genus of the Myxinoidei, 

 including the hag-fishes, so named on account of the leech-like mouth. 



Belone (Gr. " sharp " — fish with pointed nose) : the gar-pike and bony-pike, 

 Lepidosteus. 



BiBiONiDAi : a group of insects in which the males possess two pairs of com- 

 pound eyes — an upper, larger with coarse facets, and lower, smaller 

 with fine facets. The two larger eyes are contiguous or united. Carriere 

 considers that the small lower eye of the male corresponds to the whole 

 eye of the female. 



Blastocyst (Gr. blastos, bud or germ ; kuste, bladder, sac) : the stage of 

 development in which the embryo consists of a single layered vesicle. 



Blastopore (Gr. blastos, germ) : the opening leading into the cavity of a 

 gastrula. 



Bombinator (Gr. bombos, L. bombus, a humming or croaking sound) : a genus 

 of European toads. 



Brachiopoda (Gr. brachion, arm ; pous, foot) : a class of the Molluscoida 

 having two fleshy arms, continued from the sides of the mouth. It 

 includes the lamp-shells and barnacles. 



Branchiopoda (Gr. branchia, gill ; pons, foot) : a division of the Crustacea 

 comprising the orders Cladocera, Phyllopoda, and Trilobita, and 

 characterized by gills supported by the feet. 



Branchiosaurus (Gr. branchia, gill ; saura, lizard) : a genus of extinct Stego- 

 cephala. 



Branchipus (Gr. branchia, gill ; pous, foot) : a crustacean belonging to the 

 order Phyllopoda ; the group includes the brine-shrimps ; the trans- 

 parent body is unprotected by a carapace. 



Oecilia (L. Caecilia), the slow-worm or blind worm, from caecus, blind. A 

 group of limbless amphibians, with vestigial eyes, e.g. Ichthyophis 

 glutinosus. 



Cainozoic (Gr. kainos, recent ; zoos, living, life) : the Kainozoic or Tertiary 

 period of geology, applied to recent formations in which the organic 

 remains resemble more or less closely existing animals and plants. 



Cambrian System or Period (Welsh ; Cambria, Cymry) : the earliest Palaeozoic 

 rocks, which lie below the Silurian in Wales and Cumberland. It 

 contains marine invertebrates, including the earliest forms of trilobites. 



Capitosaurus (L. caput, head ; Gr. saura, lizard) : a genus of extinct stego- 

 cephalous amphibia. 



Carapace (Gr. cara, head ; karabos, beetle ; L. scarabceus ; carabus locusta) : 

 a protective covering for the head or dorsal aspect of the body. 



Carboniferous (L. carbo, coal ; fero, bear) : the Palaeozoic period, lying above 

 the Old Red Sandstone (Devonian) and below the Permian. It is 

 characterized by the presence of coal and the appearance of amphibia. 



