530 SUMMARY OF CURRENT RESEARCHES RELATING TO 
INVERTEBRATA. 
Mollusca. 
a. Cephalopoda. 
New Family of Cephalopoda.* — Prof. L. Joubin describes the 
external features of a pelagic Cephalopod — Galiteuthis armata g. et 
sp. n. — of which the only known specimen was bought by M. Gal in 
the market at Nice. In the (Egopsida division of Decapoda, there are 
four families, Ommastrephidae, Onychii, Cranchiaeformes, and Taono- 
teuthi. This new type requires a new family — Cranchionychiae — which 
should be placed third on the list. The mantle is united to the neck 
and funnel, as in Cranchiaeformes ; the tentacles bear a double row of 
hooks, as in Onychii. In short, Galiteuthis is like a Taonius with the 
tentacles of Onychii. 
Muscular Attachment in Ammonoids.f — Mr. G. C. Crick has 
studied this in many forms. As in the recent Nautilus, so in the Am- 
monoids, the shell was external, and the animal was attached to it by 
means of “ shell muscles ” and an “ annulus.” Indications of this muscular 
attachment are fairly common. In the Ammonites and such allied 
forms as Baculites, Hamites, &c., the shell-muscles were attached to the 
dorsal portion of the shell ; they frequently either approximated or met 
each other in the median line of this region ; when they did not quite 
meet, they were doubtless united by a more or less narrow band corre- 
sponding to the dorsal portion of the annulus in the recent Nautilus. 
It would appear as if the provision of an annulus were an absolute 
necessity to the animal in addition to the shell-muscles ; and most pro- 
bably Dr. Waagen’s explanation of its occurrence is the correct one, 
viz. that the annulus and shell-muscles served not merely to hold the 
animal to its shell, but formed also an air-tight band around it, fastening 
the mantle to the shell. 
Grimalditeuthis.J — Prof. L. Joubin describes Grimalditeuthis richardi 
g. et sp. n., a pelagic cuttlefish, captured by Dr. J. Pichard on the 
‘ Princess Alice ’ in the Atlantic, 23*39 long. W. and 38 * 55 lat. N. The 
body is elongated and very transparent ; the mantle shows a long dorsal 
boutonniere, joined to the siphon by two oval ventral pallial membranes ; 
there is a valve in the siphon ; the eyes are without a lachrymal sinus ; 
there are two fins, one quite terminal and sharply defined off ; there is 
a straight tubular pen ; the arms are almost equal, and the small suckers 
have small hooks ; there are no natatory brachial membranes. The 
animal belongs to the family Taonoteuthidae, of which a diagnostic key 
is given. 
y. Gastropoda. 
Central Corpuscles in Sex-Cells of Snail.§ — Dr. 0. vom Path finds 
that the sex-cells of Helix jpomatia have distinct central corpuscles, 
visible in the resting state as well as in mitosis. The siderophilous 
corpuscles are quite distinct bodies. In these and other respects the 
author’s results differ from those of Bolles Lee. 
* Ann. Sci. Nat., viii. (1898) pp. 279-92 (9 figs.), 
t Trans. Linn. Soc. (Zool.), vii. (1898) pp. 71-113 (4 pis.), 
t Bull. Soc. Zool. France, xxiii. (1898) pp. 101-13 (2 figs.). 
§ Zool. Anzeig., xxi. (1898) pp. 395-6, 413-5. 
