92 
F. ERNEST WEISS. 
which are much larger than the other two, and all along the 
arm we have an almost identical row of alternating suckers 
and pads or fixing cushions, which Steenstrup 1 (15) gives as 
a main character of the whole family of Ommastrephini. 
In speaking of the olfactory organ I spoke of the agreement 
of the cervical ridges of Histioteuthis with those of Thysano- 
teuthis, which are only reduced in prominence in Histioteuthis, 
and are more strongly developed than in Tracheloteuthis, and 
other forms which are actually included in the Ommastre- 
phidae. 
The mantle fastening in Histioteuthis is more simple than 
that figured for Thysanoteuthis by Troschel, 2 (16) from which 
it only differs by the reduction of the tooth which projects 
over the longitudinal depression at the base of the funnel. 
Another point on which great stress has been laid by 
Vigelius (14) is the presence of the renal papillae, usually 
absent in Oigopsida but occurring in Thysanoteuthis, Histio- 
teuthis, and Chiroteuthis. 
Of the striking agreement of the oviducts in Histioteuthis 
and Thysanoteuthis I have spoken before in treating of His- 
tioteuthis. The same is the case with the large nidimental 
glands which project and hang freely into the mantle cavity. 
In both, too, the ovary reaches far forward in the coelom, and 
is attached by two points and not along its entire length. 
In fact Thysanoteuthis agrees more nearly with Histioteu- 
this than with Ommastrephes with regard to its anatomy. 
The stellate ganglia in Histioteuthis are invested by a very 
strong commissure, which does not exist in Thysanoteuthis 
according to Vigelius (14), but which brings Histioteuthis in 
accord with the other Ommastrephini. In Chiroteuthis 
I was unable to discover such a commissure. 
Chiroteuthis has several points of agreement with Ommas- 
trephes, viz. the complicated fastening of the mantle, the 
position and structure of the oviducts and nidimental glands. 
Then Chiroteuthis agrees in many points with Architeuthis, 
1 Steenstrup, ‘ Oversigt Kong. Danske Vidk. Skels. Forh.,’ 1880. 
2 Troschel, ‘ Arcliiv fur Naturgeschichte,’ 1857. 
