15G BRITISH FOSSIL CRUSTACEA. 



The other appendages of the head of E. punctatus are — 1. The endognaths and 

 pa/pi (see Mem. Geol. Surv., Mon. I, pi. xi, figs. 5 — 8; and pi. xiii, figs. 9, 10, 11). 

 Mr. Salter writes : — " There are several specimens, and they present some strong cha- 

 racters for the species. PI. xiii, fig. 9, and pi. xi, figs. 7 and 8, show portions of the 

 palpi, and fig. 5 an endognath with its entire palp attached, and in the proper position 

 in respect of the great swimming-foot c." Prom this specimen it would appear that the 

 remarkable spines of the palpus were directed forward. "Figs. 8, 9, show the great size 

 these appendages obtained. The teeth of the maxillary piece (fig. 6 a, #*) are small, 

 short, and obliquely conical, not curved, and as in some other species striate ; there are 

 about seven distinct and six smaller ones, which last are either connected by a horny 

 plate (as in P. anglicus, pi. vii, fig. 5 b), or are confused with setse ; the state of preserva- 

 tion does not permit us to decide which. The margin near the teeth is punctate, 

 indicating the presence of hairs or setae. In some specimens the teeth are narrower and 

 sharper. The great palpi (of which fig. 6 only shows the base at b, and fig. 5 a nearly 

 perfect one in situ) are broader at their base than the length of the serrate border a. 

 They consist of only five joints, all except the basal one bearing (a pair ? of) curved pro- 

 cesses, while the terminal one, g in fig. 8, might even be considered as an additional 

 joint. 1 The specimen (pi. xiii, fig. 9) obtained since plate xi was completed shows all the 

 joints complete, and these resemble plate xi, fig. 7, in their elongate form. 



" Fig. 5 has much shorter joints, and may very possibly belong to a different pair of 

 maxillaa. In this figure the first joint is very broad and large, subquadrate, tapering 

 but little, rather longer than broad, and bears apparently no curved process. Its edge is 

 spinose (fig. 6 b). The third, fourth, and fifth are, in figs. 5 and 8, not very different in 

 size, and nearly square, while in fig. 7 the proportions are longer. All have the great 

 curved spines placed about the middle of the joint. 



" In the perfect palpus (pi. xiii, fig. 9) the proportions of the joints are as follows : — 

 The basal one is smaller than the second, about two thirds its length, and of a roughly 

 triangular or trapezoidal shape, the base smallest. The second is longest, half as long 

 again as its breadth ; the third and fourth much shorter, the fifth only half as long as 

 broad, and bearing one curved spine at its outer angle, and the other {g ) at its tip. 



" The second, third, and fourth joints are subcylindrical, convex at their outer margin, 

 and bear the curved spines about the middle of the joint. The terminal articulation 

 (g), if it be a separate joint, consists only of the curved process, but is probably only 

 the opposite spine of the fifth joint, seen obliquely ; and in this view there would be five 

 joints only to the palpus, each joint bearing a pair of processes, as is certainly the case in 

 pi. xiii, fig. 11. 



1 Although the specimens from Church Hill look as if there were only a single process to each 

 joint, yet, as in the palpus of this species figured in plate xiii, fig. 11, there is a pair of these organs; 

 it is most likely all the other specimens had two. In this view the two processes, /, g, would belong 

 to the terminal fifth joint. 



