72 



aquatic %itt 



i. 



2. 



3- 

 4- 



5- 

 6. 



Explanation of Plate 



Navicula yarrensis De Wittiana 

 (Kain & Schultze) Cleve (Navi- 

 cula De Wittiana, Kain & 

 Schultze). 



Navicula longa Greg. 



Navicula Schultzei Kain. 



Frustulia Lewisiana (Grev.) De 

 Toni. 



Navicula irrorata Grev. 



Pleurosigma Normanii fossilis 

 Grun. (Pleurosigma virginia- 

 cum, H. Iy. Smith). 



7. Actinocyclus Ralfsii (W. Smith), 



Ralfs var. ? 



8. Actinodiscus atlanticus Kain & 



Schultze. 



9. Anaulus mediterraneus Grun. 



10. Actinocyclus sp. ? 



11. Bupodiscus inconspicuus Rattray. 



12. Sp. ? 



13. Sp. ? 



14. Triceratium arcticum Brightw. 



15. Triceratium condecorum Brightw. 



16. Hyalodiscus stelliger Bailey? 



17. Asteromphalus flabellatus (Breb.) 



Grev. var.? 



18. Tetracyclus ellipticus (Ehrenb.) 



Grun. (Biddulphia Woolmanii, 

 Kain & Schultze). 



19. Triceratium indentatum Kain & 



Schultze. 



20. Actinocyclus sp. ? 



21. Triceratium Kainii Schultze. 

 (TV plate, page 70, is from a photo- 

 graph, by Dr. D. B. Ward, presented to 

 the editor by Professor D. E. Owen, of 

 the University of Pennsylvania. It is 

 one of a series and lacks a list of the 

 species shown. This has been supplied 

 as accurately as possible by a well-known 

 diatomist. The magnification indicated 

 on the original, five hundred diameters, 

 has been reduced approximately one- 

 sixth in the photo-engraving.) 



Bufo halophilus 



Concluded from page 69. 

 ( Hyla regilla) as nature's vocalists join 

 in discordant chorus. 



Southern California's common toad, 

 Bufo halophilus, ventures forth to breed, 



sometimes early in March and some- 

 times later, usually in April. This toad 

 is found throughout the valleys and foot 

 hills of the coastal regions and, where 

 the conditions are favorable, in isolated 

 desert places. It is not common in the 

 mountains near Los Angeles. 



The eggs are laid in great strings, 

 many yards in length, in pools of can- 

 yon washes, in irrigating ditches or in 

 large puddles left by the rains. In most 

 cases, the breeding places are dry in 

 the summertime. The young hatch in a 

 short time, as is the case with our eastern 

 toad, and the tadpoles necessarily de- 

 velop rapidly before their aquatic en- 

 vironment is changed to one of dry land. 



During the winter the adults are com- 

 mon under boards, logs, under stones 

 and in other such places, where they hi- 

 bernate. These hibernating places are 

 not usually very far from the spring- 

 time breeding pools or streams. In the 

 hot summer days the toads retire to 

 these hiding places, where it is clamp and 

 protected from the heat of the sun, or 

 find their way into the deep, damp bur- 

 row of some mammal. In the evening, 

 as the fierce southwest sun hides itself 

 behind the mountains, our little toad 

 friends venture forth in search of even- 

 ing meals, which consist of insects of 

 various kinds, worms, isopods and many 

 other animals that crawl or fly. 



Bufo halophilus is an excellent pet for 

 the terrarium and will feed readily, 

 even from one's fingers. Kept in a ter- 

 rarium he should be provided with some 

 bark under which he can find a damp 

 place to hide. Earth and grass add tc 

 his comforts, and water should always 

 be accessible. One has little difficulty in 

 feeding him if one can only get enough, 

 because our little toad is a firm believer 

 in the philosophy that to be happy one 

 must eat, whether in captivity or at large 

 in the rolling hills of young toad-hood 

 days. 



