120 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
The early part of September brought unsettled weather, 
and with it a general diminution in the number of organ- 
isms present in the tow-nettings. With the exception of 
Nauplii, very few larval forms were seen. On the 15th a 
single specimen of the free-swimming Polychete, Gattiola 
furmarchica, was taken. Ovkopleura attained its maximum 
numbers at the end of this month. 
Early in October large numbers of Pelagia vperla 
appeared in the Bay, and with them Plewrobrachia and 
Hornuphora reappeared, as also did the Radiolarians noted 
in January and February. Sagitta and Ovkopleura were 
again common on the 18th. Two specimens of the 
trochophore represented on Plate VI. (fig. 2) were seen on 
the 28th, when post-larval stages of two Polychetes were 
common. Molluscan veligers and Lamellibranch fry were 
present in small numbers on the same date. 
The November tow-nettings revealed a marked increase 
in the numbers of Diatoms and Molluscan and Tunicate 
larve. The gastrulating blastospheres represented on 
Plate VII. (figs. 2 and 3) appeared towards the end of the 
month, as did two stages of the Holothurian larva (fig. 1). 
In December the gastrulating blastospheres just men- 
tioned increased in numbers, but no further stages of 
their development were seen ; and the Holothurian larva 
again occurred. Sagitta was represented on the 17th and 
80th by two or three specimens. Several specimens of 
the trochophore represented on Plate VI. (fig. 3) were noted 
on the latter date. -Post-larval stages of four species of 
Polycheeta had each a few representatives. 
Comparison of the foregoing summary with that con- 
tained in the Eleventh Annual Report, already cited, 
shows that,in the main, the various organisms appear 
and disappear about the same times year after year. 
Finally, we print a complete list of the organisms found 
