72 Description of Genera and Species. 



What looks like the palp of the raaxillipede is shown in fig. 8, where an organ with 

 one longish massive joint with a thin continuation made up of several joints is visible. 

 Were it not that the base of this organ is too large, it might be the palj) of the second 

 maxilla. It may not be that of the mandible, as it seems to arise considerably 

 behind the body of that organ. It is just possible that it is the displaced exopodite of 

 one of the legs. 



The legs all seem to be constructed alike. The endopodites are all ver}- massive 

 and long and laterally compressed, with a longitudinal crest, and set along their 

 posterior edges with a row of sette. The tip joint is spatulate and short, and flexes 

 backwards on the next joint, which is also short, ])Ut longer than the tip joint. It also 

 flexes back upon a third joint, which is long. The length of leg may be guessed by the 

 fact that the articulation between the second and third joint reaches as far forward as 

 the tip of the proximal joint of the antennule. The legs become slightly shorter in 

 backward succession, but even that of the seventh trunk segment is of the same type 

 as the others. The exopodites of these limbs are seen in fig. 7 to be of the usual type, 

 viz., with a thickened fleshy base and ending in a many-jointed plate or lash. Frag- 

 mentary structures resembling l)roken gills are seen near the base of the last trunk limb 

 in fig. 8. 



The appendages of the tail are only moderately well preserved. Those of the two 

 first segments of a male are seen in fig. 9 to consist of a very massive basal joint. The 

 second joint is not very well preserved, but to judge from what is shown, it was modified 

 in the usual way for coupling the spermatophores on to the females. The pleopods of the 

 second tail segment are modified similarly to those seen in Ant/wacophausia. There is the 

 same long basal joint followed by a second longish joint which supported a much thinner 

 cylindrical branch, one joint of which is seen in fig. 7. Fig. 8 is apparently that of a 

 female ; all the tail limbs seen folded up together are supplied with swimming plates only. 

 The basal joints of all these limbs are seen to be rather massive. The uropods of the 

 sixth segment are long and slender, as seen in fig. K). The basal joint is somewhat 

 long, and the external branch long and blade-like with longitudinal strenthening keel, 

 and this extends considerably beyond the tip of the telson. The inner bi-anch has not 

 been observed, and was probably shorter and of the usual linguate form. Fig. II is an 

 attempt to reconstruct a male of this form twice the natural size. 



Locality. — Ardross Shore, near St. Monans, East Fife. 



Horizon. Abden Limestone, near top of (Scottish) Calciferous Sandstone Series. 



Collector. — Wm. Anderson. 



