PELTIDIUM. rORCELLIDIUM. 



The antennas and other appendages of the cephalothorax 

 are similar to those of Peltidhun purpureum. 



The first pair of legs are also somewhat like the same pair 

 in that species, but the first and second joints of the outer 

 branch, which are nearly of equal length, are each of them 

 furnished with a short seta near the middle of the outer 

 margin and a similar seta springs from near the distal end 

 of the inner margin of the second joint ; the end joint is very 

 short, and is armed with terminal claw-like spines as shown 

 in the drawing (PL XIV. fig. 11). The inner branch is 

 stout and two-jointed : a seta springs from the distal end of 

 the inner margin of the first joint, while the second joint is 

 furnished with three terminal setae one near the end of the 

 inner margin and two at the apex. 



The second, third, and fourth pairs of legs appear to 

 resemble the same appendages in Peltidium purpureum. 



The fifth pair appear also to be similar to those of that 

 species, but are rather smaller (PI. XL fig. 9). 



The first segment of the abdomen forms a trilobed plate 

 which entirely overlaps not only the posterior abdominal 

 segments but also the furcal joints, and in this respect our 

 specimen differs very markedly from other described species, 

 in which the last abdominal segment and furcal joints are 

 exposed. 



This specimen does not agree with any described species 

 known to us ; and the more obvious characters by which it 

 may be distinguished are its uniform dense colour, its broad 

 and obscurely tridentate rostrum, and the large trilobed first 

 abdominal segment. 



Habitat. The &cilly Isles. 



PORCELLIDIUM FIMB1UATUM, ClaUS. 



1863. PorceUidium jimbriatum, Glaus, p. 140. pi. xxii. fig. 1. 



1880. Purcellidium Jimbriatum, Brady, vol. ii. p. 167, pi. Ixx. 



figs. 1-4. 

 1904. PorceUidium Jimbriatum, G. O. Sars, p. 76, pis. xliv., xlv. 



Salcombe, dredged, June 30th, 1875. New Grimsby 

 Harbour, iScilly Isles, May 23rd ; and near Chequer Buoy, 

 Plymouth, August 23rd, 1903. 



PORCELLIDIUM VIRIDE (Philippi). 



1840. Thyone viride, Philippi, Archiv fur Naturgesch. Jahrg. 6, 

 p. 190, pi. iv. fig. 2. 



This species was taken in the same gathering with the 

 previous one in New Grimsby Harbour, Scilly Isles ; and 



