63 



occurrence of a well developed supracostalis, the union of levator scapulae 

 and serratus magnus, the thoracic extension of the scalenus group — interlock- 

 ing both with the serratus magnus and obliquus internus. The aponeurosis of 

 the obliquus externus presents a well devoloped division of the internal pillar 

 of the external abdominal ring , dovetailing with the one from the opposite 

 side and forming the triangular ligament of the same. — Mr. H. E. Crampton, 

 Jr., reported some of his 'Observations upon Fertilization in Gasteropods'. 

 The observations were made upon the eggs of a species of Doris, collected 

 last summer on the Pacific Coast by Mr. Calkins, and upon a species of Bulla 

 which deposited eggs at Woods Hole during the months of August and Sep- 

 tember. The results may best be summarized by stating that a complete con- 

 firmation was obtained of the accounts of fertilization given by Wilson & 

 Mathews, Boveri, Hill for sea-urchins, Meade on Chaetopterus, Kostanecki 

 and Wierzejski upon Physa, etc. The sperm nucleus is preceded by the 

 divided centrosome , an aster, however, not being found till the union of the 

 germ-nuclei. The first polar spindle has at each pole a double centrosome, 

 the second maturation spindle but one. These are of great size, however, 

 and the one remaining in the egg finally disintegrates, the centrosomes of the 

 first cleavage spindle being derived from the sperm. The germ -nuclei do 

 not fuse, but lie very close to one another, in contact. — Mr. N. R. Har- 

 rington gave an account of the life history of Entoconcha^ a mollusc para- 

 sitic in a Holothurian. His paper was illustrated by photographs. — The 

 following paper was read by title: N. R. Harrington and B. B. Griffin : 

 'Notes on the Distribution, Habits, and Habitat of some Fuget Sound In- 

 vertebrates'. — C. L. Bristol, Secretary. 



3. Deutsche Zoologische Gesellschaft. 



Die siebente Jahres-Versammlung 



der 



Deutschen Zoologischen Gesellschaft 



findet in 



statt. 



Kiel 

 vom 9. — 11. Juni d. J. 



Allgemeines Programm : 

 Dienstag den 8. .Juni Abends von 8 Uhr an: 



Begrüßung und zwanglose Vereinigung im » Seegarten c 

 Mittviroch den 9. Juni Vormittags: 



Erste Sitzung. 



1) Eröffnung der Versammlung durch den Vorsitzenden, 

 Herrn Prof. Bütschli. 



2) Bericht des Schriftführers über das Geschäftsjahr 1896/97. 



3) Referat des Herrn Prof. Brandt: Über die Fauna der 

 Ostsee, insbesondere die der Kieler Bucht. 



Nachmittags: 



Demonstrationen. Besichtigung des Zoologischen Instituts. 



