^ -- XKT^_- --^ ^-^T^^ ^ 



' ^ \ y it"- 



THE OPHIURID^. 



161 



1 







Evidently this very large genus needs to be subdivided, and then such 

 forms as A. nereis, papiUaicty (and moclcstal) perhaps would forma separate 



genus. 



40. Amphilepis patens Lym. 



Plate X. l^igs. 8-10 



Lysian : Challenger Opliiuroidea, p. 149, Plate XIX, Tigs. 1-3. 



To this species we refer, with some little doubt, a specimen from Station 

 3414, 2232 f. The A. patens Lym. was taken between Valparaiso and Juan 

 Fernandez (2160 f); thus the locality seems to indicate that they are identi- 

 cal. There are however some rather important differences, which make 

 the identification somewhat doubtful; we therefoi^e have thought it best to 

 describe and figure our specimen. 



Diameter of disk, 7.5 mm. ; width of arms close to disk, 1.3 mm. 5 length 

 of arms unknown. Three close set papillae on each side of the mouth angle, 

 short but broad ; at the apex, between the inner pair of papillae, is seen the 

 lowest tooth, or mouth papilla. At the pore of the second mouth tentacle 

 are seen two small scales or papillae, inserted on the side mouth shields. 

 (Not in Lyman's specimens.) These latter papilla) alone correspond to the 

 true mouth papillae in Amphmra ; those along the mouth slit correspond to 

 that seen a little higher up in the mouth in Amphiuj^ay but w^hich is not 

 there reckoned among the true mouth papillaB. Mouth shield triangular, 

 with an acute angle inwards, outer corners rounded, the sides almost 

 straight ; a little more broad than long. Side mouth-shields broader with- 

 out than within, where they meet. 



First ventral plate small, rounded 3 the second has inner angle truncated, 

 outer edge doubly curved (not in Lyman's figure), a little more broad than 



Those beyond all distinctly separated (though scarcely so much as 

 .in the figure), almost twice as broad as long; they have all a very obtuse 

 angle within, and outer edge curved; inner and outer laterals re-enteringly 

 curved. Side arm-plates with sj)ine ridge rather prominent (more than in 

 the figure). There is a naked space separating the side arm-plates of each 

 two adjoining joints, not seen from the dorsal side. Dorsal plates trans- 

 versely oval, twice as broad as long, not in mutual contact; the inner one 



is rudimentary. 



The disk is covered on the dorsal side with rather large, delicate, over- 



lapping scales, among which the primary plates are 



long. 



t 



distinct. Along the 



■ ^nr^i^^i^'l^^ ^^^ 



*j ■ i-i-«^ix>rtKriE 



