164 



ECHINOIDEA. II. 



2 6th plate (in lyrifera they begiu 011 the 2— 3rd plate). The peripetalous fasciole forms, in accordance 



with the great length of the posterior petals, a rather elongate figure. The subanal fasciole is very 

 strongly developed, and a small anal branch extends from it along each side of the anal area towards 

 the peripetalous fasciole. In none of the specimens before me, however, does it reach more than half 

 way up. 



With regard to the tubefeet a single feature must be noticed, viz. that the piates of the rosette 

 are very broad in their outer part, and generally divided into 2—3 lobes (PI. XVIII. Fig. 17). The spi- 

 cules (PL XVIII. Fig. 16) are more spinous than in lyrifera. 



The pedicellariæ are very characteristic and show at once this form to be very distinct from 

 the other species. Globiferous, tridentate, rostrate, ophicephalous and triphyllous pedicellariæ are found. 

 The globiferous pedicellariæ (PI. XVIII. Figs. 15, 21, 28) are especially found in the posterior ambu- 

 lacra, off the subanal plastron, where they may form a very conspicuous stripe, being generally dark 

 brown and rather large — ca. i™'" head. The stalk is very short, ca. 0-2""", with a small thickening 

 on the middle, but no circlet of thorns. There is no neck. The valves bend a little inwards and are 

 provided with mostly 2, sometimes i or 3, strong, upwards directed teeth, placed in the median line 

 on the outer side, just above the basal part; sometiiues these teeth are coalesced, sometimes the 

 lower of them points downwards; I have found a single small globiferous pedicellaria, where they are 

 wanting. The blade is narrow, quite closed, ending in two very long teeth. The basal part is ratlier 

 small, the edge is smooth, as is also the case with the almost straight edge of the apophysis. There 

 is a thick skin around the valve.s. Evidently this form corresponds to the long, narrow form of globi- 

 ferous pedicellariæ in Br. atlantica. Probably also the other form will prove to occur in this species. 



The tridentate pedicellariæ (PI. XIX. Fig. 12) ma>' reach a considerable size, up to 1-5""" (head), 

 but otherwise occur in all sizes down to quite small ones. They are mostly, the larger ones exclusively, 

 found around the mouth and on the posterior ambulacra on the actinal side. The valves are widely 

 separated, joining only towards the point. The blade is narrow in the lower part, not very deep, but 

 generally with a well developed meshwork at the bottom. No distinct longitudinal keel along the 

 outer side. The edge is smooth, only with i — 4 large, a little outwards directed, teeth towards the 

 outer part. The end of the blade, where the valves join, is somewhat widened, the edge being finely 

 but rather deeply serrate. The basal part is rather small; the edges are smooth, as is also the edge 

 of the apophysis. The smaller specimens have the edge of the lower (shorter), narrow part of the blade 

 quite smooth; there is no meshwork at the bottom. Otherwise they do not differ essentially from the 

 larger ones, and only one form of tridentate pedicellariæ eau be distinguished. Even in the smallest 

 ones the valves join only with the outer half of the blades. The neck is very well developed; the 

 stalk is long, consisting of rather loosely connected fibres. The milled ring at the lower end is rather 

 indistinct. — The rostrate pedicellariæ (PI. XIX. Fig. 171 which I have found only in the specimen 

 from '(Albatross* 2145, are very characteristic; the blade is narrow, rounded in the point and closely 

 serrate some way down the side edges. The point is not widened. Only quite small specimens were 

 found. The ophicephalous pedicellariæ (PI. XVIII. Fig. 21, which occur almost exclusively on the naked 

 posterior ambulacra on the actinal side, are small, without neck, as usual among the Irregular Echi- 

 uoids; the stalk is irregularly fenestrated, not distincth' fibrons; its upper end is cupshaped; no milled 



