4 REPORT OF STATE BIOLOGIST 



METHODS OF EXAMINATION AND RESULTS. 



Iii making the following examinations one valve of the clam 

 was removed, the visceral mass opened above the "foot," and 

 some of the contents, after being spread on a glass slide, were 

 examined under high and low powers of the microscope. 

 When spawning, the ripe eggs, readily recognized with low 

 power, look like Figure 1. 





Under the high power, the actively moving sperm resemble 

 Figure "2. 



RESULTS OF MICROSCOPICAL EXAMINATION. 



•fan. 15, 1890. — No • ggs nor sperm. 



Feb 27. 1899.— A very few immature ess< No ripe sexual products. 



M ar . __ 1899.— Omitted examination. But note that the February examination was 



very late. 

 Apr. IT. 1899.— Eight clams examined. 



Nil. i, ripe sperm. 



N •. -. ripe sperm. 



No. 3, many mature eggs 



No. t. many mature • sfgs. 



N( i. ■"). many mature eg - 8 



No. •'. ripe s] erm. 



Nn. 7. ripe sperm. 



No. s . spoiled. 

 13, 1899.— Ten clams examined. 



No. 1. full <>f ripe eggs 



No. -. full of ripe eggs. 



No. :. full of rip* eggs 



No. •">. full <>f iii • .--. 



No. 7. full of ripe eggs. 



No. 4, full of ripe sperm. 



N . 6, full of ripe sperm. 



No. 8, full of ripe sperm. 



