8 G-. O. Sårs. 



in form, and have the posterior edge somewhat thickened and 

 armed all round with a number |of short but strong, dark 

 horn-coloured spines. Similar spines are also found on several 

 of the segments of the metasome, but are here restricted to 

 the dorsal face. The last caudal segment (see fig. 14) has 

 dorsally, on each side, a knob-like prominence encircled by- 

 small spines, and carrying on the tip a very delicate sensory 

 bristle. On the lower side of this segment the anal orifice 

 occurs, and above it at the end, the segment is prolonged to 

 a thin lamella projecting between the caudal filaments. This 

 lamella somewhat varies both in size and form according to 

 age, but in fully grown specimens is rather elongated, about 

 equalling in length the 4 preceding segments combined. It 

 generally exhibits a narrow linguiform shape, being almost of 

 equal breadth throughout, and obtusely rounded at the tip 

 Dorsally it has an obtuse keel armed with a varying number 

 of short spines, and the edges are all round densely fringed 

 with small denticles of somewhat unequal length. 



The caudal rami are of the usual structure, being very 

 slender, filiform, and more or less diverging. They are thickest 

 at the base and gradually taper distally, being divided into 

 short, indistinctly defined articulations encircled with small 

 spines, which inside assume the character of delicate bristles. 



The eyes (see fig. 1) are easily observable, occurring dors- 

 ally on the most prominent part of the carapace, in front of 

 the cervical sulcus. They are subreniform, and obliquely 

 disposed, being almost contiguous in front but widely apart 

 posteriorly. Immediately behind them, the postocular tubercle 

 is visible as a rather small, rounded protuberance. 



The antennulæ (see figs. 2 & 3) are rather small, and 

 issue on each side just within the border of the shelf-like 

 frontal duplicature, extending generally anteriorly beneath the 

 latter. They consist each of a short basal part divided into 

 several indistinctly defined joints, and of an oblong fusiform 



