CHAP, iv.] THE CRUISES OF THE i PORCUPINE: 



weight by being lifted out of the water, and sink 

 ing slowly away back again to our inexpressible 

 anguish; glossy whisps of Ilyalonema spicules; a 

 bushel of the pretty little mushroom-like Tisiphonia ; 

 a fiery constellation of the scarlet Astropecten temds- 

 pinus ; while a whole tangle was ensanguined by the 

 ' disjecta membra ' of a splendid Brisinga. 



There was not much in the dredge-bag that was 

 new. Some large Munidte, with their ( spheery eyne ; ' 

 some fine specimens of Kophobelemnon mulleri ; an 

 example of the Euryalid, Asterowyx Icveni. nearly 

 the only Scandinavian echinoderm which we had not 

 previously taken ; and an injured specimen of a 

 flexible urchin, which we supposed to be of the same 

 species as that procured the day before, although it 

 differed greatly in colour, being of a uniform pale 

 grey. Upon further examination, however, it proved 

 to be the type of a totally different generic group of 

 the same family. 



Phormosoma placenta resembles Calveria in having 

 the perisom flexible, the plates overlapping in the 

 iame way and in tli3 same directions ; but the plates 

 Dverlap one another only slightly, and they leave no 

 membranous spaces between, so that they form a 

 continuous shell. The great peculiarity of this form 

 is that the upper surface is quite different from the 

 iower. Above, the ambulacral and interambulacral 

 irese are well defined and in ordinary proportion, 

 "he interambulacral areae being just twice as wide 

 is the ambulacral, and the spines are much like 

 ;hose of Calveria, and are arranged nearly in the 

 >ame manner. At the periphery the shell comes to 

 i kind of ridge, and alters entirely ; from the edge 



M 



