302 THE BIOLOGY OF MARINE ANIMALS 



marked differences in the relations of the two kidneys to certain substances. 

 The aglomerular kidney is unable to excrete glucose, xylose, sucrose and 

 inulin. Glucose is reabsorbed by the tubules of glomerular kidneys, xylose 

 and sucrose to a small extent, and inulin not at all. Magnesium, calcium, 

 phosphate, phenol red, creatine and creatinine are excreted by both 

 glomerular and aglomerular kidneys of fish. Excretory-N is concentrated 

 several-fold, and teleost urine contains about 80 mg/100 c.c. Levels of 

 ammonia are very low; urea forms some 10-20% of total urinary nitrogen 

 in fish such as the flounder and sculpin, but only about 1 % in Lophius. 

 A large part of the total nitrogen consists of TMO and creatine or creat- 

 inine, which are concentrated by the kidney tubules (5, 5a, 6, 7, 13, 14, 16, 

 23,34,41,52). 



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