1008 A REVISION OF THE AUSTRALIAN ISOPODA, 



three last pairs have the meros and carpus like those of the 

 preceding two pairs, but the dactylos is hook-like and armed 

 internally with a double row of acute spinules. The uropoda have 

 a well developed ramus with from five to seven sabequal articuli. 



The surface of the body is irx'egularly mottled with blackish 

 spots. The length is about a quarter of an inch. 



In the Port Jackson specimens the terminal joint of the 

 superior antennae is relatively longer and narrower, and the 

 second joint of the inferior antennse relatively shorter. 



PaRATANAIS LINEARIS. N. Sp. 



[Plate L. Figs. 9—16.] 



The body of this species is extremely narrow — the length being 

 about ten times the breadth. The head with the coalescent first 

 segment is about twice as long as the second segment ; it bears on 

 either ends a strong tooth-like process directed backwards and 

 downwards. The segments of the thorax are nearly equal, but 

 increase a little in length and decrease slightly in height towards 

 the posterior end. The abdominal segments are all equal, about a 

 third of the length of the last segment of the thorax. The superior 

 antennae are stout and short, scarcely so long as the head and first 

 segment ; with only five joints, of which the second is the largest. 

 The lower antennae have four joints, of which the two proximal are 

 the largest, w^ith a strong tooth at the supero-distal angle of the 

 second ; the fourth joint is very small and scarcely half the length 

 of the third. The first pair of thoracic appendages are very stout, 

 as long as the head and following two segments ; the meros, carpus 

 and propus all stout, the carpus the largest ; the immobile finger 

 has a rounded tvibercle ornamented with a few hairs. The 

 following three pairs of appendages are slender, the propus con- 

 siderably longer than the carpus, the dactylos slender, continued 

 into a delicate hair-like [joint. The last three pairs of thoracic 

 appendages are rather stouter than the preceding pairs ; the meros, 

 carpus and propus are each ornamented towards the distal end 

 with a few conical or curved spines, of which two placed at the 



