88 Bulletin Wisconsin Natural History Society. [Vol. 7, Nos. 3-4. 



and mollusks. A fine series of chitons, mollusks of the genus Placo- 

 phora, ranging in size from one to eight inches, was exhibited by the 

 speaker ; he also showed a similar series of barnacles, shrimps of var- 

 ious species, hydroids, sponges, etc. Parasitism was touched upon, as 

 that of a small crab on the sea-clams, and Sacculina on shrimps. 



From marine collecting Mr. Brues passed to collecting on the Is- 

 lands and the main-land. The speaker named some of the distinguish- 

 ing features of the fauna and flora of the region. As especially strik- 

 ing he showed a number of large slugs that he had collected on one of 

 the islands. A species of salamander was exhibited which shows closer 

 affinity to the European Triton than to its American relatives. 



Mr. Brues concluded his narrative with the exhibiton of a specimen 

 of seaweed, the stalk of which measures over twenty feet in length, 

 ending in a swollen spherical float bearing long ribbon-shaped thallus 

 leaves. 



Some of the speaker's remarks were informally discussed by the 

 members. 



The thanks and appreciation of the members were extended to Mr. 

 Brues by regular vote. 



Upon motion the meeting then adjourned. 



Milwaukee, Sept. 9, 1909. 



Meeting- of the combined sections. 



President Earth in the chair. 13 peoiDle present. 



Minutes of the last section meeting read and approved. 



R. A. Muttkowski opened the evening's symposium on Albinism and 

 Melanism. Mr. Muttkowski spoke with special reference to the Lepi- 

 doptera. As causes of albinism and melanism he enumerated humidity, 

 temperature, food geographical position and light. In considering the 

 effects he dwelt on the composition of the colors of Lepidoptera, and 

 noted which colors are affected by the various cases. He called atten- 

 tion to the fact that influences may begin at any time in the life 

 history of the species. The speaker exhibited melanic specimens of 

 Anosia plexippus, Catocala <<ira and cerogama; albinic specimens of 

 Eurymus eurytheme, Deilephila lineata, and a number of others. 



Mr. Henry L. Ward then followed with an account of Albinism 

 and Melanism as evidenced in mammals and birds. Mr. Ward called 

 attention to the fact that colors characterize many species and most 



