AMPIIIUKA SQUAMATA. 



121 



of disk ; about 130 to a square min. ; those below rather smaller. Ra- 

 dial shields narrow, pointed within, with straight sides ; inner ends only 

 separated by a scale, joined for the rest of their length ; length to 

 breadth, .7 : .o. Arm-spines four, a little way out only three ; short, 

 rounded, tapering but slightly, blunt, stout, with a rounded point ; 

 nearly equal, but the two lower ones a tritle longer than the two upper; 

 the middle spine is stoutest and bluntest of all, and a little rough under 

 the microscope; length to that of under arm-plate (fifteenth joint), .4:. 3, 

 Tentacle-scales two, standing at right angles to each other ; inside one 

 lying along lateral side of under arm-plate ; the free edges of ])oth 

 cin-ved. Color, dry : disk, above, white, arms faded neutral tint ; below, 

 much paler. 



Variations. — The mouth-shields may be proportionately longer and 

 sharper, or shorter and blunter. The arms above may be irregularly 

 banded with lighter. Dr. LeConte gives the color as "pale gray, arms 

 marked with scattered brown spots." 



This species is distinguished from A. occidentalis and from A. atra 

 by the dilierent forms of the under arm-plates and mouth-shields. 



LIST OF SPECIMENS. 



Catalogue 

 Number. 



Original Number 

 Number, of Spec. 



Locality. 



"When 

 Collected. 



Whence obtained. 



Nature of 

 Specimen. 



Museum of Comparative Zoology. 

 244 I 1199 1 1 I Panama. | | Dr. J. LeConte. | Dried. 



1199 



Smithsonian Institution. 

 2 I Panama. I I Dr. J. LeConte. i Dried. 



Amphiura squamata Sars. 



Asterias squamntn Dellk Ciiia.te. INIemorie, HI. p. 77. 1828. 

 OpJiiura neglecta JoiixsTOX. Mag. Nat. Hist., p. 4G7. 1835. 

 Ophiocoma neglecta Forbes. Brit. Starfishes, p. 30. 1841. 

 Ophiolepis squamata Mi'll. & Trosch. Syst. Asteridon, p. 92. 1842. 

 Ophiolepis (Amphiura) squamata Sars. Middclhav. Lit. Fauna, II. p. 84. 1857. 

 Ophiolepis tenuis Ayres. Proceed. Boston Soc. Nat. Ili.^t., IV. p. 133. 1852. 

 Amphiura tenuis Lymax. Proceed. Boston Soc. Nat. Ilist., VII. p. 194. 1860. 



Special Marks. — Arms from two and a half to four and a half times 

 the diameter of the disk. Three regular, tapering, blunt spines ; the 

 two lowest equal, the uppermo.^t a little stouter. 



k; 



