926 LIVERPOOL BIOLOGICAL SOCIETY. 
NUDIBRANCHIATA. 
Sub-Order. ACANTHOBRANCHIATA. 
Family. DoRIDIDz. 
Archidoris tuberculata, Cuy. 
This species is not uncommon on the shore at Puffin 
Island. It is very variable in the colouring. 
Lamellidoris bilamellata, Linn. 
In abundance at Hilbre Island on the 2nd March, 1889, 
when it was spawning; a month later very few specimens 
were found. 
L. prozima, Ald. and Hane. 
Several specimens of this local species were found at 
Puffin Island in March, 1888, and on 18th February, 1889. 
The radula of this species is as described and figured by 
Alder and Hancock, except that the large lateral spines in 
our specimens have their points directed forwards and 
lying parallel to one another, in place of pointing outwards 
laterally as is shown in Alder and Hancock’s figure.* 
The exact shape of these large spines differs considerably 
in different parts of the series. 
Acanthodoris pilosa, Muller. 
Specimens were found on the shore at Puffin Island on 
1ith June, 1887, in March, 1888, and on 18th February, 
1889, and at Hilbre Island on 2nd March, 1889. : Among 
the latter were some dark coloured and speckled specimens 
approaching the black form previously recorded. Those 
found at Puffin Island include white, grey and nearly 
black forms. 
* Ray Society, ‘‘British Nudibranchiata.” Part vii., pl. xlvi., fig. 8. — - 
