4(5 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
though not new they are interesting from the point of geographical 
distribution. The species were Pentacrinus Wyville-Thoinsoni, Antedon 
lusitanica, A. phalangiurn , the discovery of which at 500-700 fathoms 
more than doubles its bathymetrical range, and A. Dubeni. 
Coelenterata. 
Claus and the Development of the Scyphomedusse. * — Prof. A. 
Goette gives this title to a pamphlet in which he answers Trof. C. 
Claus’s criticism of his researches on the development of Aurelia aurita 
and Cotylorhiza tuberculata. As Goette claims, in his embryological 
memoir, to have upset almost all that Claus has written on the subject, 
and as Claus says that he cannot trust Goette’s figures, there is 
naturally occasion for some polemical discussion, of which, however, 
the Germans have not yet learned to make a fine art. Perhaps for us, 
who can here express no opinion, the most profitable thing to do is to 
contrast the views of the two zoologists. 
According to Claus. 
Gaslrulation. 
The eudoderm of Aurelia is 
formed by a sac-like invagina- 
tion of the blastospliere. [But 
subsequent modifications of this 
conclusion leave a somewhat con- 
fused impression, for he appears 
to admit the immigration of 
scattered cells and describes the 
endoderm as a solid, compact 
mass of cells.] 
The Oesophagus of the Scyphostoma. 
The ectodermic invagination 
at the free end of the fixed larva 
is again evaginated and forms 
only the mouth and its disc. 
[But again, by modifications of 
this conclusion, Claus approaches 
if he does not actually accept 
Goette’s interpretation.] 
The Gastric Pouches. 
Claus at first denied the 
existence of gastric pouches, but 
lie has, since the publication of 
Goette’s investigations, recog- 
nized their existence and calls 
them as Goette did, without, it 
seems, recognizing their dis- 
coverer. 
According to Goette. 
The eudoderm of Aurelia is 
formed by successive immigra- 
tions of cells or groups of cells 
from the wall of the blasto- 
spliere. 
The ectodermic invagination 
at the free end of the fixed larva 
persists as the oesophageal tube. 
As diverticula of the primi- 
tive gut two pairs of gastric 
pouches ( Magentaschen ) are 
formed. 
Leipzig, 1891, 64 pp. and 21 figs. 
