EURYPTERUS PUNCTATUS. 157 



" The processes themselves are directed obliquely outwards and forwards ; they are 

 long, curved, sabre shaped, and much compressed, fully three times as long as the width 

 of the joints, to which they are attached by a swelled base. They are striated longi- 

 tudinally, the striae, eleven or twelve in number, sharply impressed, not continuous 

 except near the tip, but interrupted alternately (pi. xiii, fig. 10) for wide spaces, so that 

 the number of striae appears little more than half what it really is. Nor are the striae 

 quite parallel to the sides, for they abut obliquely against the concave side towards the 

 tip of the process. Here and there some striae are stronger than the rest. 



" Near the base of the processes the striae are still more interrupted and run into 

 short impressed lines or punctae." 



The subjoined woodcut (Fig. 51) of the endognath of E. punctatus (the outline of 

 which is partially restored from actual specimens figured by Mr. Salter and from others 

 in the British Museum) will, perhaps, best explain the peculiar form of these organs, 

 and also exhibit their close correspondence with the same appendages in E. scorpioides 

 (see PI. XXIX, fig. 1, and XXX, fig. 9, accompanying this part). 



Fig. 51. — Endognathary palpus of E. punctatus, Salter, sp., restored from actual specimens, from the Lower Ludlow, 

 Church Hill, Leintwardine, Shropshire, drawn of the natural size. Some of the fragments figured by Mr. 

 Salter would indicate appendages twice as large as this figure. 



"The specimens on pl. xiii, figs. 5, 6, 11" (op. cit.), writes Mr. Salter, " are from the 

 Upper Ludlow Rock. Fig. 11 is a very perfect joint of the palpus, with both spines 

 attached ; and figs. 5 and 6 show the characteristic long plicae. Fig. 6 at least would 

 answer best to one of the long joints of the antennae ; it is but a cylindrical fragment of 

 the proximal end, and has the contraction which is visible in the corresponding joint of 

 P. anglicus (see pl. iv, fig. 4 c, op. cit.) At this part the plicae are very numerous and 

 small ; in the body of the joint they are large, prominent, and elongate, and with the 

 channel-like depression and its bounding ridges (fig. 6 a) magnified. They are somewhat 

 unequal in size, and set at more than their diameter apart from one another." 



"The swimming-feet," writes Mr. Salter (plate xi, figs. 12 — 15) "are very different 

 in proportion to those of P. anglicus, the terminal joints occupying a considerably greater 

 length, and being abruptly wider than the rest. Of the great basal joint (c o, in fig. 5) 



