26 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
groove is to be found on the inner side of the mantle. There are only 
two pairs of adductors of the funnel. The optic orifice is pyriform in 
shape. The single species, C. jimbriatus, has been found in the Medi- 
terranean. This new genus has some remarkable peculiarities, but may 
be placed with the Ommatostrephidee. 
The author has bad the opportunity of examining various specimens 
of Veranya sicula. In its chief characters this species agrees with most 
of the other (Egopsida, but there are some points which may be peculiar 
to it ; such are the presence of two commissures between the visceral 
nerves, which have not been reported in any other Decapod ; the position 
of the heart is rather octopod than decapod in character ; in the feeble 
development of its musculature Veranya approaches the Cranchiidae 
and Chiroteuthidae. 
Some observations are offered on Loligo Alessandrini of Verany, which 
Dr. Appellof places with Calliteuthis ; the liver was seen to consist of 
one mass, which indicated its double nature by a shallow groove. The 
accessory is much more spacious than the true stomach, and has a distinct 
spiral twist. The heart is elongated in the transverse direction of the 
body, and is so curved that the tip from which the cephalic aorta arises 
looks forwards ; the posterior aorta arises in the hinder margin of the 
heart ; the efferent duct of the ink-bag is very short. Calliteuthis reversa 
Yerrill is now for the first time recorded from the Mediterranean ; it is a 
species of wide distribution, as it has been found on the North Atlantic 
coast of America and in New Zealand and Japan. 
y. Gastropoda. 
List of Opisthobranchiate Mollusca of Plymouth.* — Mr. W. 
Garstang gives a complete list of the Opisthobranchiate Mollusca 
hitherto found at Plymouth ; fifty-four species are, in all, recorded. With 
regard to the colour-changes in Aplysia punctata , which M. Vayssiere 
attributes to the nature of the bottoms upon which they are found, the 
author remarks that the living Aplysia whose colour-changes he observed 
was kept under the same conditions for two months. The characters 
of the radula are discussed in great detail. All the known specimens of 
Lomanotus appear to belong to L. genei , notwithstanding the fact that 
some six specific names have been applied to them. Mr. Garstang gives 
a quantity of interesting information regarding many of the species 
which he catalogues. 
Nervous System of Parmophorus australis.f — M. L. Boutan finds 
that three sets of nerves are given off from the ventral nervous mass of 
Parmophorus ; from the lower surface nerves go to the foot only ; from 
the sides others pass to the lower mantle, and between these there are 
nerves which pass directly to the mantle. It may, therefore, be justly 
concluded that the ventral nervous mass is both a pedal and a pallial 
centre. The author combats the views of those who regard Fissurella 
and Parmophorus as intermediate between the Lamellibranchiata on 
the one hand and Chiton and even worms on the other; the apparent 
symmetry of the adult is an acquired character, and the farther back we 
* Journ. Marine Biol. Assoc., i. (1890) pp. 399-457 (2 pis.). 
t Arch. Zool. Exper. et Gen., viii. (1890) pp. xliv.-viii. 
