>80 . DB MALCOLM LAURIE ON 



up on the outer side. Beyond this articular surface the joint continues as a triangular 

 process which Conns the inner ramus of the pincers. The outer margin of this — i.e., 

 that against which the terminal joint bites — is straight, and shows no sign of denticula- 

 tion. It ends in a sharp point. The terminal joint forming the outer movable ramus 

 of the pincers is 2 mm. longer than the inner ramus (i.e., 7 mm.) and is curved, the con- 

 vexity being toward the outer side. It also appears quite smooth on the margin. The 

 basal joint of this appendage probably passed upwards at a sharp angle (or may even 

 have been directed backwards) to its point of attachment. From their structure it 

 would seem as though the chelicerse could only bite by a single point. 



Appendage II. — Slanting inwards and backwards from outside the cheliceraB and 

 overlapping each other just behind their apices lie the ends of the 2nd pair of append- 

 ages. The form is somewhat indefinite, and they had probably a thin cuticle that on 

 the right side shows two conical spines, while on the left side there are indications of 

 spines and a considerable number of setse. These appendages were probably tactile like 

 the corresponding pair in Slimonia. 



Appendage III. (fig. 10). — The gnathobase of this, I have not made out; in fact, 

 only the four distal joints are known. They are all short and tapering, and the two 

 proximal ones furnished each with a stout spine. Markings on the sides of these joints 

 seem to be the points of attachment of other spines. This limb is very short when com- 

 pared with the corresponding one in St. elegans. 



Appendage IV. (fig. 11). — This is a reproduction of Appendage III. on a larger 

 scale. The spines are longer and more delicate, and the terminal segment appears to 

 bear several. A spine is seen arising from the side of the antepenultimate segment. 



Appendage V. — The five distal segments of this limb are shown in fig. 12. They 

 are less elongated and slightly broader than the corresponding segments in Appendage 

 VI. 



Appendage VI. (fig. 12) shows the great elongation of all the segments, especially 

 the two proximal ones (2nd and 3rd). The length and narrowness of the 2nd joint 

 is in marked contrast both to St. macrophthalmus and St. elegans. 



The metastoma was incorrectly figured in my former paper (loc. cit., PI. I., fig. 7), 

 the front margin being shown much too deeply cleft and simple. Fig. 8 shows it as 

 it ought to be, and shows further that the front margin is crenulated. 



St. elegans, n. sp. (PI. II., figs. 13-15. PI. III., fig. 19.) 



Carapace long and narrow, tapering towards the front. Metastoma comparatively 

 wide ; 3rd and 4th appendages long and furnished with backwardly directed longitudi- I 

 nally ridged spines ; 5th and 6th appendages with 2nd joint comparatively short, broad, 

 and subcorneal ; tail segments probably narrow and with sharply pointed epimera, and 

 telson wide in proportion to last segment. 



Five specimens certainly, and two probably, belong to this species. The type 



