Verrill, Notes on JRadiata. 261 



spines regular, even, in three rows. The upper surface of arms and 

 disk is straw-colored, with narrow transverse bars and irregular spots 

 of deep brown or blackish ; under side dull yellowish. 



Amphiura geminata Liuken,* op. cit, p. i22 



Ophioltpis geminata LeConte, op. cit., p. 318. 

 Amphiura geminata Lyman, op cit, p. 180. 



Two specimens of this species have been sent from Panama by Mr. 

 Bradley, both of which are injured. 



It has long, slender arms, witli four rows of spines at the base (in 

 well-grown specimens) and three farther out, of which the middle one 

 is largest and bluntest and somewhat rough. There are three mouth- 

 papillae on each side of the mouth-slits, of which the outermost is 

 broader than both the others. Mouth-shields lance-shaped, with the 

 inner end acute. Lower arm-plates pentagonal, broader than long, 

 with one angle turned inward. Disk covered by small even scales, a 

 little larger toward the edge of disk. Radial shields narrow, pointed 

 inwardly, in contact, except at the inner ends, which are separated 

 by a scale. 



According to Mr. Lyman, a specimen had arms 1 "4 inches long, with 

 a disk '16 in diameter. Our specimens are somewhat smaller, but 

 have the arms broken. They are, in alcohol, yellowish white, with a 

 few small, light brown spots on the upper arm-plates. 



Amphiura Violacea Liitken, Vldensk. Meddelelser, 1856 ; Addit. hist. Oph., p. 123. 



Li the collection from Panama there is a small specimen, apparently 

 identical with this species. Dr. Ltitken's specimens were from Realejo. 



According to Dr. Liitken, it has the following distinctive characters : 

 Mouth-shields small and lance-shaped ; side mouth-shields large and 

 triangular ; under ai'm-plates as long as broad, and separated, like the 

 upper plates, which have the same form as those of A. inicrodiscusj 

 Liitk., but are less broad, by the side arm-plates. Diameter of disk 2"^"\ 



Amphiura Puntarenae Liitken, op. cit., 1856; Addit. hist. Oph., p. 123. 



A single specimen from Panama, too imperfect for description, is 

 doubtfully referred to this species. Dr. Ltitken's original description 

 is as follows : The mouth-shields are a little longer than broad, and 



* This and the other species here named Amphiura belong to the genus, Amphi- 

 pholis Ljung, — Keprint. 



f A. microdiscus Liitken, was described as follows : Disk small, arms thick, but thin 

 at base ; upper arm-plates twice as long as broad, outwardly shghtly and inwardly 

 strongly curved; lower arm-plates as long as broad, without an indentation; diameter 

 of disk 1™™. Puntarenas, 10 fathoms. 



