40 



BULLETIN OF THE 



posterior margin, the tooth upon the fourth l)eing prominent and horizontal 

 and occasionally having a secondary tooth above its base. The two dorsal 

 carinae of the filth somite are high and sharp, and each armed with a sharp 

 tooth near the middle and with a similar one projecting over the posterior 

 margin. The sixth somite is about once and a half as long as the fifth, its 

 dorsal carina; are very high and sharp and each armed with five to seven 

 acute teeth of which the posterior project over the margin as in the fifth somite ; 

 the posterior margin is in addition armed with two spines each side, one at the 

 inferior angle and another above the l)ase of the telson. 



The outer lamella of the uropod is a little longer than the sixth somite, 

 about twice and a half as long as broad, and obtusely rounded at the tip ; the 

 inner is longer than the outer, ovate-lanceolate, and not quite a third as broad 

 as long. 



The teLson is about once and a half as long as the sixth somite, tapers regu- 

 larly throughout, and is ornamented above with two carinae converging to the 

 tip, which is acute, unarmed, and naked. 



All the exposed surfaces of the carapax and abdomen except the spines and 

 carinae, and a considerable part of the surface of the appendages, are clothed 

 with a very short and dense pubescence, which readily brushes off with the soft 

 mud with which most of the specimens are covered. 



Six specimens give the f(dlowing measurements in millimeters : — 



326 



326 



337 

 c? 



326 



326 

 9 



312 

 9 



56.0 



65.0 89 98.0 77.0 125.0 



Station 



Sex ..... 



Length from tip of rostrum to tip 

 of telson 



Length of carapax including ros- 

 trum 



Length of rostrum 



Length of antennal scale . 



The eggs are very large, being, even in alcoholic specimens, about 2.5 and 

 3.0 mm. in least and greatest diameter, while in S. septemcarinata they are 

 about 1.0 by 1.4 mm. in alcoholic specimens. 



The number and arrangement of the branchiae are the same as in 5. septem- 

 carinata, and may be indicated by the following formula : — 



