16 AMl'HirilA SQUAMATA. 



out conspicuous primary plates; usually about four scales in the length of a 

 mm., and even fewer on the under surface. Radial shields small, irregular 

 oval, slightly diverging, separated by a wedge of four scales in a line and one 

 or two smaller ones on the sides; length to breadth, 1 : .5. Arm-spines, near 

 disk. six. rounded, tapering, sbarp, increasing in length from the upper to the 

 under one. whose lengths to that of an under arm-plate arc .7. .9 : .5. Ten- 

 tacle-scales two, minute, and standing at right angles. Tentacles, especially 

 those of the mouth, thick and cross-wrinkled. 



Color, in alcohol, nearly white. 



In young specimens the lower disk-scales are feeble. 



Hassler Expedition; Juan Fernandez. 220 fathoms. 



1 have been of the opinion that Ljungman's genus AmpMpholU was not suf- 

 ficiently grounded, differing from AmpMura only in haying three or four 

 mouth-papillae on a side, instead of two with a space between them. The 

 present species comes in as a connecting form ; and a glance at Plate V. will 

 show that the variety in number, shape, and position of mouth-papillse in the 

 genus AmpMura, including Amphipholis, is considerable. 



Amphiura squamata Sars. 



I am not able to distinguish a specimen from Chili from the A. squamata of 

 South and North Europe, or of North America. Already (Butt. Mui. C. Z.. 

 Ill 335) I have called attention to the possible identity of species nearly 

 allied to this and coming from distant localities. Ljungman endeavors to 

 distinguish these species by the number of upright scales along the margin 

 of the disk in each interbrachial space; bul I satisfied myself, by counting 

 those of many specimens, thai this number varies. Thus, thirteen specimens 



from Spezia, having disks from 1.2' to 2. •>"""■. had from live to eight inter- 



brachial scales, and the number was no! always in proportion to the size of 

 the specimen. Two specimens from the Adriatic, with disks of 2.2 and 



bad eight, nine, or ten scales. Two from Naples, having disks of 2.2""" 

 and 3.8°" . bad eight, nine, eleven, or twelve scales. This Chilian specimen, 

 with a disk of 2.5 , bad nine Interbrachial bcs 



II isslei Expedition ; Talcahuano Baj . 



