75 



having only two rows of paleae, the shape of the inner being 

 siicli that it compensates for the absence of the second inner 

 row. Though Schmarda described and figured the palea^ as 

 notched at the tip, the condition differs, since the thin chitinous 

 spathulate tip has a fold on the under surface the end of which 

 projects dorsally in the form of a spur. When viewed in 

 certain positions, as obhquely from above, the appearance of a 

 notch is simulated by the arrangement. On the other hand a 

 lateral view gives a hatchet-shape to the blade, and the terminal 

 spur is very prominent. The palea3 are crossed by curious 

 transverse lines, which, especially along the convex edge, 

 assume a wavy direction, and, moreover, a scaly aspect, appar- 

 ently from friction, occurs along the same edge near the tip. 

 Whilst it is possible to recognize these paleiv in Schmarda's 

 description and figure, it is otherwise with the inner palea-. for 

 the contour of the latter, according to him, corresponds with a 

 lateral view of the outer form — as a comparison of his figures 

 with those of the " Challenger " will show. 



The tip of the inner pale;i3 is bluntly pointed, then it gradually 

 expands into a large thick heel which projects beyond the 

 somewhat slender shaft, so that the latter nearly forms the apex 

 of a triangle, and the serrated upper or anterior edge the base. 

 These are evidently modifications of the same type. In this 

 case the outline resembles an attenuated leg with a long tapering 

 foot furnished with a huge heel, the latter having the dorsal 

 surface crenated. In one of the examples (a large one) two 

 blades of a broad Alga were attached by their stems to the inner 

 paleiv, as in the case of that mentioned in the " Challenger " 

 volume — and which had a single blade which overhung the 

 crown like an operculum. A little below the bases of the 

 outer palete of the crown a closely set series of lobate cirri with 

 narrow stems occurs They are tinted of the deep purplish 

 hue of the region, though in some specimens much of it is 

 abraded. The cephalic branchia? have about i6 stems on each 

 side of the fork. The mouth has a long cirrus, or occasionally 

 two, at the outer and posterior border of each palpus. 



In the richly tinted thoracic region are the three typical sets 

 of bristles. The oar-shaped forms of the dorsal row have a 

 smooth blade. A high power shows only a few minute spines 

 at the point of the most perfect examples, few of which are 

 symmetrical distally. All have marked stria- at intervals. The 

 ventral bristles are shaped somewhat like the hairs of Otnitho- 

 rliviichus, the shaft dilating into a fusiform tip which is pointed. 

 The hooks have a double row of teeth and an indistinct process. 



The branchia- are continued — from the first segment of the 

 long posterior region of the body — throughout the greater 

 part of its length, the posterior organs, however, being rudi- 

 mentary. They cease at the seventh or eighth from the end— to 

 which is attached the long anal tube. 



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