202 A. E. Verrilli—Results of Recent Dredging Expeditions. 
however, found very useful for killing certain kinds of animals 
in an extended condition. It succeeded well, in this respect, 
with many nemerteans and some annelids, but did not affect 
all the species alike. Our success with it, in this way, was so 
great as to encourage us to make many additional trials of this 
kind during the coming summer. Many experiments were 
made last season, as in previous years, to find some poison that 
will kill mollusks, especially Gastropods, in a fully extended 
state. though numerous drugs have thus been tried, the 
results = hitherto been mostly negative. At least, no 
s been discovered that is more generally successfull 
than by js soa them to suffocate in stale sea-water, throug 
excess of carbonic acid and deficiency of oxygen. Many ex- 
cellent preparations of the larger species (Fulgur, Buccinum, 
Natea, &c.) were thus made last summer. In most cases when 
the ani was found to be well extended, and at the same 
time so stupified as to be nearly inactive, the soft parts were 
forcibly held out by the hand while it was killed by immer- 
sion in alcohol Sometimes it could be tied to the body of the 
alcohol. The accompanying figure was made from a specimen 
way.* 
prepared in this w 
* Figure 1. Sycotypus canaliculatus, two-thirds natural size; a, head; }, pro- 
boscis extended, showing the odontophore at the end; c, male organ, bent forward, 
(it is ordinarily bent back under the mantle; in Fulgur carica this is a quite differ- 
ent, thin, flat, tapering, tongue-shaped organ); d, mantle; e, siphon; 2 lower side 
of foot ; 8 he geewron ge aperture of shell; 4, canal; j, body whorl; &, inner lip; 
