160 
MARINE FAUNA OF ST. ANDREWS. 
sented by a narrow pedicle. The fourth pair has a narrow 
shield turned over at the free edge, and, instead of the two 
narrow spikes below, there is a flattened organ which forks 
into a narrow and a broad flap at the tip. The fifth pair has 
its inner division broad and flattened, and its outer small, 
but widened at the tip; the median division has a very 
regular arrangement of bristles at its tip, which points or 
slopes inwards. 
The parasitic Peltogaster paguri frequently occurs on the 
abdomen. 
Pagurus cuanensis , Thompson ; Bell, op. cit. p. 178. 
Occasionally from deep water. 
Pagurus ulidianus , Thompson (?) ; Bell, op. cit. p. 180. 
St. Andrews Museum. I cannot speak with certainty of 
this form. 
Pagurus Icevis , Thompson; Bell, op. cit. p. 184. 
Occasionally in the stomach of the haddock. 
Fam. Porcellanidse. 
Genus PORCELLANA, Lamarck. 
Porcellana platycheles , Penn.; Bell, op. cit. p. 190. 
Abundant under stones between tide-marks, especially in 
runlets, and on muddy ground. A group of young forms of 
some size may sometimes be seen in company with their 
parents. 
The first pair of foot-jaws have their two terminal segments 
furnished with the longest hairs (proportionally) yet met with 
in the local forms- The hairs have a double row of spikes, 
diminishing towards base and tip, and ceasing before arriving 
at the end of the hair, which has very fine linear serrations. 
The external division has a powerful triangular, and some¬ 
what tapering, lower segment, and a delicate appendage fringed 
with a brush of spiked hairs at the tip. The second pair has 
