LAMP-SHELLS AND THEIR ALLIES 25 



pea, though it sometimes grows a little larger. This 

 species is seldom found on the shore, but a large 

 number were dredged off the southern coast of Cali- 

 fornia a few years ago. The shells are sometimes 

 thickly coated with fine mud. It has also been 

 found in Puget Sound, and even farther to the 

 northward. 



Nucula suprastriata^ Cpr., the Fine-lined Nut- 

 shell, has a much smaller shell, and the sculptured 

 lines are concentric, instead of forming angles. It 

 probably lives within about the same limits as the 

 last species. The abbreviation "Cpr.," printed after 

 the name of the shell, shows that its name was given 

 by that great naturalist. Dr. Philip P. Carpenter, 

 who lived a generation ago. Let me remind you 

 again that near the close of this book you will hnd 

 a brief biographical list of the principal men whose 

 names or initials are appended to the Latin names 

 of the species. It is a goodly list, and is worthy of 

 being read by every young person who wishes to 

 honor those who have done so much to make our 

 present knowledge possible. It makes our shells 

 seem more alive and interesting if we know who 

 studied them and gave them their names. 



Nucula tenuis^ var. lurida^ Gould, the Thin Nut- 

 shell, is the common species found in moderate 

 depths about Alaska, and in deeper waters farther 

 south. It has also been known as N . expansa, Rve. 



Nucula carlottensis, Dall, the Charlotte Nut-shell, 

 is a small species only six mm. long, and was dredged 

 from deep water off Queen Charlotte's Islands by 

 the U. S. Steamer "Albatross." It has been con- 



