MORPHOLOGY. 
Cod . 9 
and female gonophore bunches alternating on the same stock. The 
gonads originate in the endoderm of the primitive bud. A very remark- 
able point is that in the young ova there are, without exception, two 
nuclei of very different size and structure. The larger is granular, and 
poor in chromatin ; the smaller homogeneous, and very rich in chromatin. 
In the older eggs the small nucleus leaves the large one, approaches the 
periphery, and is lost. A full description of male and female gonophores 
is given. Chun thinks it is probable that in such forms as this, notwith- 
standing Wcismann’s viows to tho contrary, wo liavo stages in the evolu- 
tion not tho degeneration of tho medusa. 
Brooks & Conklin (9) give an account of the structure and develop- 
ment of the gonophores of a certain siphonophore belonging to the 
Auroncctcc. They show no traces of medusoid structure, but are simply 
egg pouches. 
Schneider (G5) describes the ganglia and nerve plexus in the pneu- 
matopliorc and tentacles of the Siphonophora , Apolemia , and Fordcalen , 
and gives an account of the histology of the nematocyst batteries in 
these forms. 
Smith (69) describes some early stages in the development of Aurelia 
favidula , and points out that the gastrulation is typical, since from the 
beginning the archenteron is an open sac-like cavity. 
C4 cette (28) writes a paper of G4 pages in support of his statements 
and views concerning the development of Aurelia aurita and Coiylorhka 
tuberculata. 
Claus (15) in referring to Yanhoffen’s paper says that ho has confused 
the words “ tetrameral ” and “ octomeral,” with “ vierstrahlig und 
achtstrablig.” 
Anthozoa. 
Haddon & Siiackleton (30) introduce the words “ sulcular ” and 
“ sulcar ” in place of the words “dorsal” and “ventral” in referring to 
the mesenteries of the Actinice. Thus in a sea anemone xyith twelve 
mesenteries, there will be two sulcular directives, two sulculo-sulcular 
lateral, two sulco-sulcular lateral, two sulculo-sulcar lateral, and two 
sulco-sulcar lateral mesenteries, and two sulcar directives. 
Cerfontaine (10) describes the mode of development of the twelve 
primary mesenteries of Cereactis. The first pair divides the ccelenteron 
into two unequal chambers, the second pair appear in the larger chamber, 
the third in the smaller, and the fourth pair in the space bounded by the 
mesenteries of the second formation. The development of the mesen- 
teries of Asteroides calycularis is also described, and the order of develop- 
ment of the tentacles is found to be the same as in Actinia mesembryan- 
themum. 
Faurot (24) points out that the difference in length presented by the 
first eight mesenteries of Ceriunthus calls to mind the disposition of parts 
