362 Mr. G. M. Thomson on a new 



remarkably large species originally known only from the 

 Auckland and Campbell Islands. 



The genus Faramitlirax is represented in New Zealand by 

 four species. Of these the three formerly described species, 

 P. Peronii, M.-Edw., P. minor, Filhol, and P. Latreilli, 

 MierSj are found along the coasts of both islands from between 

 tide-marks to a depth of 20 fathoms. They are smaller than 

 the species described here as P. longipes, and differ not only 

 in the length of their legs, but in having the external 

 maxillipeds smooth externally, so that the various articulations 

 can be easily made out, while in the new species these ap- 

 pendages are buried in a dense mass of felted hairs. 



The following is a description of the species : — 



Paramithrax longipes, sp. n. 

 (Pis. VII. & VIII.) 



Carapace almost smooth. Spines of the rostrum not di- 

 vergent. Branchial regions with four submarginal spines. 

 Basal joint of external antennae nearly square above, its inner 

 margin bearing a ridge which ends in a blunt tubercle. 

 External maxillipeds buried in thick hairs, except a central 

 white knob. Carpus of chelipeds tubercled, but without 

 ridges ; fingers smooth internally. 



Male. — Carapace ovoid, rather convex, with a somewhat 

 pronounced dorsal ridge ; surface covered with scattered 

 tubercles, rising occasionally on the median line into blunt 

 spines, destitute of hairs. 



The rostrum is produced into two long acute spines, the 

 intermediate space being filled with short hooked hairs. 



The hepatic region rises into a prominent pointed tubercle 

 at a short distance from the margin. 



The four submarginal spines on the branchial region are 

 placed at a considerable distance from each other, the last 

 well up on the dorsal surface. A ridge with a few tubercles 

 passes obliquely forwards across the front of the branchial 

 region, while in the middle of the same, a little distance to 

 each side of the median line of the carapace, there rises a 

 prominent spinose tubercle. 



The sternal plate is deeply hollowed out between the bases 

 of the chelipeds and is transversely ridged opposite each 

 ambulatory leg. The abdomen is 6-jointed j the first joint 

 is very nariow, the next much wider, the rest contracting to 

 the extremity. 



The basal joint of the external antcnnte is broad, nearly 

 square above, its outer margin somewhat curved and ending 



