ZOOLOGY — GRIFFIN, HOWARD. 279 



Griffin, Lawrence E., Missouri Valley College, Marshall, Missouri. 

 Grant No. 81. Expenses of a trip to the Philippine Islands in 

 order to secure material for a study of the embryology , histology, and 

 physiology of the Nautilus. $1,000. 



Abstract of Report. — Professor Griffin went first to the locality 

 where Mr. Dean C. Worcester secured his Nautili in 189 1, the town 

 of Manjuyod, on the eastern coast of the southern part of Negros. 

 After the traps were put out a large cage was built of bamboo, in 

 which Nautili could be kept at a depth of 15 or 20 fathoms. The 

 inside of the cage was hung with sacking, in the hope that the 

 Nautili would attach their eggs to the folds. Under many adverse 

 conditions, as stated in the full report, several lots of Nautili were 

 placed in the cage, but all died without depositing eggs. Prof. 

 Griffin considers it doubtful if any of them revived from the half- 

 dead condition they were in after being hauled up from the great 

 depths in which they live and the long journey to shore. While 

 the cage experiments were in progress he was preserving specimens 

 which were too far gone to revive in the water, as well as the extra 

 males for histological and anatomical study. 



As far as securing the embryology of Nautilus is concerned, the 

 expedition failed; but material was secured for the further study of 

 the anatomy of Nautilus and for a complete study of the histology 

 of this unique form. Work on them will commence soon. 



Howard, L. O., Department of Agriculture, Washington, District 

 of Columbia. Grant No. 250. Preparation of an elaborate mono- 

 graph on American mosquitoes. (For previous reports see Year 

 Book No. 2, p. xlii, and Year Book No. 3, p. 138.) $3,000. 



Abstract of Report. — Considering that the mosquito fauna of the 

 main inhabited regions of the United States has been rather fully 

 worked up by the investigations of the last two years, an especial 

 effort has been made during the season of 1905 to secure material 

 representing the mosquito fauna of south Mexico, Central America, 

 West Indies, and Alaska. 



A trained observer, Mr. Frederick Knab, was sent to south Mexico, 

 and reports considerable success. One important result of his work 

 has been to show that the yellow-fever mosquito (Stegoi?iyia fasciata ) 

 occurs on every point on the Pacific coast where he has stopped, from 

 Salina Cruz southward. While it was quite to be supposed that this 

 would be the case, there has up to this time beeu no authentic record 

 of the fact. This observer proceeded southward to Salvador and 



