1889.] ANATOMY OF GONATUS FABRICII. 127 
the posterior end I regret my inability to give a satisfactory account 
of its distribution, and the more so since it would have been interesting 
to ascertain how far it agrees with what Brock! has indicated as the 
typical arrangement among the (Egopsida. All that I am able to 
assert is that this vessel does not branch until a distance of about 
2 centim. from the heart; at which point it bifurcates. It seems 
probable that these two branches represent the anterior and posterior 
aortee of Brock, in which case I have failed to discover the arteria 
genitalis ; this, however, is not much to be wondered at considering 
the state of preservation of the specimens. ‘There were no aortic 
hearts to be seen in any of these vessels. 
The Vena Cava (v.c.) bifurcates on a level with the anterior part 
of the ventricle; a branch passing to each branchial heart, at 
the entrance to which it is joined by a vein passing from behind 
forwards over the dorsal surface of the branchial heart (p.v.c.). 
A third vein (0.v.), beset like the others with renal  sacculi, 
passes over the dorsal surface of the left branchial heart and then 
turns downwards over the root of the left gill to join the other 
vessels entering the left branchial heart ; it probably comes from the 
ovary, but it was impossible to make this out with certainty. 
The right branchial heart (br.h.”) is somewhat smaller and 
more distinctly quadrate in form than the left (dr.4.'). Each of 
them bears upon its dorsal anterior margin a small flattened sphe- 
roidal pericardial gland (p.gl.). 
IX. Respiratory Organs. 
The Gills appear, on the whole, to be constructed on the same 
type as in Ommastrephes *, as was noticed by Verrill. 
X. Excretory and Generative Organs. 
Regarding the Renal Organs nothing more of any importance was 
made out than has been noted above (p. 119). 
But little can be said regarding the generative organs. The two 
larger specimens which I examined were both females, as was shown 
by the presence of the oviducts (Plate XIII. fig. 3, od.). There 
are two of these, which are gently curved and pass forwards 
just external to, and on the dorsal surface of, the rcot of each gill. 
Their extremities are pointed and the opeuing is a slit on one side of 
the tip. 
Nidamental glands are present as two flattened sausage-shaped 
bodies, with their convexities directed towards each other, in the 
middle line. They present the usual lamellar structure. 
Regarding the male organs Verrill makes the following state- 
ments :—‘‘ The specimen is still immature, and probably only one 
year old. The spermary or ‘testicle’ is small (length 15”", 
diameters 2™™ and 4™™), flattened, tapering backward, partly 
1 Op. cit. p. 247. 
ee “ Struct. et dével. de la Branchie des Céph.,” Arch, Zool. exp. (2) 
iu, . 
