358 TBANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



the secondary grooves are deep and well marked, far more 

 so than is indicated in M'Intosh's figure (PL XIV., fig. 11), 

 they are not confined to the ventral surface but extend 

 some distance on to the lateral portions of the dorsal 

 surface as well. 



The figure and description of the cephalic furrows given 

 by Joubin (5, p. 129) may refer to Amphiporus dissimu- 

 lans ; they certainly do not represent A. pulcher. 



Amphiporus lactifloreus (Johnston). 



Shore, common (see Vanstone). 



Amphiporus dissimulans, Eiches. 



Numerous specimens of an Amphiporus closely re- 

 sembling A. lactifloreus, yet readily distinguishable from 

 that species on careful examination, were dredged in the 

 same localities as Amphiporus pulcher : No mature example 

 was taken ; the length of the majority was only from 6 to 9 

 mm. v/hile a few reached 2 to 3 cm. After the examination 

 of adult specimens of A. dissimulans at Plymouth I have 

 no hesitation in referring the Port Erin form to this 

 species. 



The larger specimens were brownish-yellow to dull 

 orange in colour, depending largely on the colour of the 

 alimentary tract and also on the presence of minute 

 granules of yellowish brown pigment in the integument. 

 The smaller ones were of a fairly deep salmon colour due 

 entirely to the gut, no superficial pigment being as yet 

 apparent. The brain was plainly visible as a translucent 

 body of a pale yellowish tint. 



The body was round and somewhat slender, and attained 

 its maximum thickness a little in front of the middle 

 point, diminution of size being very gradual in either 

 direction. 



In the structure of the stylet apparatus and in the 

 position of the side-organs which open some distance in 



