NO. 1 HILL : A NEW GENUS OF BRITTLE STARS, AmphtCOntUS 3 



longer than broad, meeting fully within, but well separated radially by 

 the first under armplate, which is rounded pentagonal, approximately as 

 broad as long with a nearly straight distal margin; subsequent plates 

 pentagonal, broader than long, with a proximal angle; lateral angles 

 rounded, distal margin scarcely concave. No tentacle scales or pores. Lat- 

 eral armplates with prominent spine-ridges, bearing 3 heavy, subequal, 

 blunt spines ; spines longer than arm segment. 



Color. — Cream white, with the following exceptions: some of the 

 primary plates of the disk and some of the dorsal armplates have splotches 

 of brown or nearly black. 



Types. — Holotype, AHF no. 3; 6 paratypes, one in the Museum of 

 Comparative Zo6log\s Cambridge, Mass., No. 5861. 



Type locality. — South side of Tagus Cove, Albemarle Island, Gala- 

 pagos, in 12 fms. 



R.emarks. — At the type locality, on the south side of Tagus Cove, 

 Albemarle Island, Galapagos, the records indicate that the bottom is 

 composed of coarse, black sand. Records also indicate that the dredge 

 contained one other echinodenn, Paidia horrida (Gray), and two species 

 of crahs, Stenorhynchus debilis (Smith) and Port U7ius (Achelous) anffus- 

 tus Rathbun. 



At Station 384-35, three fourths of a mile off the east shore of Inde- 

 pendencia Bay, Peru, the bottom was coarse white sand with an abun- 

 dance of sea weeds and red algae. This haul was rich in spider crabs, 

 Pyromaia tuber culata (Lockington) and Inachoides microrhynchus 

 Milne Edwards and Lucas. In addition to the crabs a number of worms 

 were in the same haul. 



