280 



branches. One of these branches supplied the liver, and the two others 

 supplied each the ventral and dorsal wall of the sac. 



An examination of the outer, dorsal surface and of the right hand 

 side of the anterior end of the sac shewed the existence of a slit-like 

 aperture, the position of which is indicated by the arrowed line and by 

 the index line of F. Upon passing a probe into this it was found to lead 

 into the distal loop [D] of the stomach which extended right up to the 

 anterior extremity of the sac. At the hinder end of this slit-like aper- 

 ture was the semi-crescentic lip of the triangular-shaped invaginated 

 caecal pouch (/), the apex of which is directed backwards into 

 the sac [8') itself, and which has already been noticed as being 

 supplied by a branch of the lieno-gastric artery [O]. 



The interpretation of the condition just described , is obviously to 

 be sought in the distribution of the coeliac artery (C). The fact that 

 this artery supplies the internal surface of the sac (*S") clearly indi- 

 cates that it is the everted proximal limb of the stomach, and consequently 

 this dogfish must have lived with the inner surface of its stomach turned 

 inside out and everted into the pharyngeal cavity. The distribution of 

 the right and left gastric branches of the vagus nerves corroborates this 

 conclusion, since each are turned round the coelomic orifice of the sac 

 and spread out over its internal dorsal surface, of their respective sides. 



That the condition here described was a permanent one is shewn 

 by the great length of the lieno-gastric artery and by the presence of 

 the invaginated sac I. At quite an early stage in the differentiation of 

 the primitive gut; the proximal loop of the stomach probably become 

 gradually everted, this eversion setting up on the one side, a tension 

 upon the lieno-gastric artery which grew with the growth of the everted 

 sac, and on the other, a tension upon the proximal loop of the stomach 

 near its junction with the distal loop, and which resulted in the for- 

 mation of the invaginated sac I. 



The animal was fully nourished and the ovary was of normal size 

 and laden with large eggs. The specimen is in the Museum of the London 

 Hospital Medical College. 



5. Diagnosen neuer japanischer Alcyonaceen. 



Von Prof. W. Küken thai, Breslau. 



eingeg. 21. März 1906. 



Die hier aufgeführten Formen stammen zum größten Teil aus der 

 Reiseausbeute Herrn Dr. Dofleins, einige auch aus dem Material der 

 Museen zu Berlin, Wien, Hamburg und München. 



