154 



THP] OPIIIURIDtE. 



the arm, and even here not on each joint; that on the side arm-pLate, which 

 is usually placed at the base of the lower arm-spine, may be distinct far 

 out on the arm, but not to the end ; sometimes, however, the latter scale is 

 the first to disappear, sometimes only a few of the inner pores have ten- 



tacle scales at all. 



Color in alcohol : gray. 



Three specimens from Station 3374, 1823 f. One of the specimens has 



ST 



the mouth shields quite irregularly formed. 



The two species, A. Diomedew and A. assimilisy appear to be nearly 



related to A, chilcnsis (M. & Tr.), or one of them may be identical w^ith 

 it 3 but nothing can be said with certainty about it before that sj)ecies has 



been figured. Lymak* has given a sketch of the mouth part of it, but 



he adds a query, so it is not to be relied upon. If it be right, A. Diomedece 



and A. assimilis are not nearly related to this species. 



# 



34. Amphiura dalea Lym. 



Plate XII. Figs.' 8-13. 



Lyman. Challenger Ophiuroidea, p. 137, Plate XVIII. Pigs. 11-13. 



To this species we refer three specimens from Station 3361, 14-71 f., and 

 one from 3414, 2232 f. As there are, how^ever, certain differences from 

 Lyman's figures, we have thought it best to give figures of our specimens 

 also. 



Lyman says there are three mouth papilla) on each side, besides those on 

 the apex. In our specimens there appears to be the same number of mouth 

 papilte ; however it is clear, especially in the smallest specimen, that the 

 inner one of these three papilla) does really belong to the first mouth ten- 

 tacle, thus corresponding to the papilla seen in this place in other species of 

 Amphmra^and which is not reckoned among the true mouth papilla). The form 

 of the mouth shield is very like that seen in Lyman's figures ; in one speci- 

 men it has the form seen in Figure 8 a. The ventral plates in our figure 

 are rather different from those in Lyman's figure ; nor does his description, 

 '^ broader than long, angular, and with re-entering curves on the sides, where 

 are the tentacle pores,'' correspond very well therewith. As there is, how- 

 ever, some variation in regard to their form, the outer edge being sometimes 



* OpluLLfida; and Asiropliyticlic of tkc Ilassler Expedition, ill. Cat. Mus. Comp. ZouL, No. VIIL, 

 Part II. Plate V. Pig. 77. 



^ 



