DIFFERENT FORMS OF STAR-FISHES. 



19? 



pentagonal, with five short arms. The fine large Solaster 

 endeca Eetzius has eleven smooth arms ; it lives in deep 

 water. Crossaster papposus (Miiller and Troschel) is com- 

 mon on a rocky bottom, in from twenty to eighty fathoms, 

 from the Gulf of Maine northward ; it is bright red, and has 

 thirteen to fourteen spinulated arms. Cribella sanguin- 

 olenta Liitken is a common species on the coast of New 



Fig. 140. Archaster vexUlifer, under side ; natural size. After Wyville-Thompson. 



England below low- water mark, and is in some respects like 

 Crossaster. 



More closely allied to Asterias is the Pacific Coast Pycno- 

 podia helianthoides Stimpson, which ranges from Sitka to- 

 Mendocino, Cal. It is very common in Puget Sound, under 

 wharves. Asterias vulgaris Stimpson represents, on the- 

 northeastern coast, the A. rubens of Europe. Asterias 

 volaris (M. and T.) has six arms, and is over twelve inches- 



