SHALLOW-WATER STARFISHES 365 



The type had mostly a single spine on the ventral plates, while the 

 Patagonian form usually has two spines on many of the plates. There 

 are, also, some differences in the dorsal spinulation, so that they may 

 prove to be distinct; yet I am not aware that it has been found in 

 tropical seas by later collectors, and the ancient Bourbon Island label 

 may have been wrong. I have examined numerous specimens from 

 Magellan Strait, and found but little variation, but have seen no 

 authentic tropical specimens. It has a thicker dermis than usual, and 

 is not a typical Patirietla. 



P. calcarata and P. pusilla are, however, more nearly allied to sev- 

 eral African and Australian species than to any in the northern hemi- 

 sphere. 



Asterinides perrieri=Asterina perrieri de Loriol, 1904, a small 

 species from E. Patagonia, Gulf of San Mathias, appears to belong 

 to the genus Asterinides, but may be closely related to P. fimbriata 

 or bispinosa. 



Enoplopatiria marginata, which has been recorded from near the 

 eastern end of Magellan Strait, is a common Brazilian species, extend- 

 ing northward to the West Indies, and recorded also from the west 

 coast of Africa. A closely related new species, E. siderea, in our col- 

 lection, is labeled as from Panama (donor, Captain Dow, of the 

 Panama and California steamship line). 



E. siderea Verrill is a rather large species, radii, 24 mm. and 48 mm., 

 with stout, short, broad rays and well defined papular areas, with 

 numerous forked dorsal pedicellarias ; ventral plates with a comb of 

 three elongated spines ; four webbed furrow spines. 



It differs from E. marginata in having the spinules of the inter- 

 radial dorsal plates longer, widely divergent, stellate and paxillif orm, 

 and in other characteristics ; but it is evidently closely related, so much 

 so that I formerly suspected the correctness of the label, thinking that 

 it might have come from Colon, on the Atlantic side, and might be 

 only a large variety of E. marginata. See plate cix, figure 4. 



The family Ganeriidae is very characteristic of the Patagonian- 

 Fuegian fauna. Indeed, nearly all the known genera and species 

 are from that region and adjacent districts. 



Of the genus Ganeria Gray, 1847, Perrier, 1891, recognized four 

 species; viz.: G. falklandica Gray, 1847, Falkland Islands; east of 

 Magellan Strait, 55 fathoms, Sladen; G. robusta Perrier, 1891, 28 

 meters; G. hahni Perrier, 1891, 138 meters ; G. papillosa Perrier, 1891, 

 depth not given. 



