BY WILLIAM A. HASWELL, M.A., B.SC. 1013 



pereion are of nearly equal length — the last being a little smaller 

 than the rest ; the pleon is a little longer than the last segment of 

 the pereion ; the segmentation is obscurely indicated. The inner 

 (superior) antennae are shorter than the head very slender, with a 

 rudimentary flagellum. The outer are as long as the head, with 

 stout basal joints and a rudimentary flagellum of four articuli with 

 a dense fringe of extremely fine short hairs. The first pair of legs 

 have the carpus produced into an infero-distal process which is 

 armed with a few spinules ; the propus is dilated, the palm 

 presents a deep excavation the border of which is minutely 

 serrulate, the dactylos has a tuberculated elevation near its base. 

 The following pairs are short and stout, the carpus of each 

 is a little produced infero-distally, and is here ornamented with 

 a row of very minute spinules with a single larger spine and 

 three or four fine hairs. The propus is likewise ornamented along 

 its inferior border towards the distal end with minute spinules 

 and has a stronger spine at the infero-distal angle ; the dactylos 

 is large, two-thirds of the length of the propus and is biarticulate. 

 The rami of the uropoda are ovate. The telson is ovate, narrowing 

 a little towards the apex. 



The length is half an inch. Each of the segments is marked 

 with a large patch of blackish purple. 



Port Jackson. 



EXPLANATION OF PLATES. 



[Plate L.] 



Fig. I. — Tanais Tenuicornis, lateral view. 



Fig. 2. —Superior antenmu of the same species. 



Fig. 3. — Inferior antemia3 of the same. 



Fig. 4. — Terminal joints of first pair of pereiopods of the same. 



Fig. 5. — Second pair of periopods of the same. 



Fig. 6. — One of the posterior pairs cf pereiopods of the same. 



Fig. 7. — Uropod of the same. 



Fig. S. — Lips of pincers of first pair of pereiopods. 



Fig. 9. — Paratanais linearis. 



Fig. 10. — Superior antennae of the same. 



