38 AAlPniFOUA NOKJIALIA. 



occupies about half the length of the inferior margin ; a small 

 protuberance and spine mark the termination of the palm, which 

 impinges against the apex of the dactylos ; the carpus is shorter 

 than the propodos, and has the inferior margin moderately pro- 

 duced. Thii'd pair of pereiopoda shorter than the two next. 



Female. — Propodos of the first pair of gnathopoda oblong, two margins 

 nearly parallel, tnincate at apex ; dactylos not longer than breadth 

 of propodos ; carpus with a short triangular or rounded prolongation 

 below. Propodos of the second pair a little larger, but of similar 

 form ; carpus long, produced below, and obtuse or rounded at the 

 extremity ; third joint also much produced. 



Length ^ijths of an inch. 



Hah. New Zealand (Dr. Andreiv Sinclair, by whom it was pre- 

 sented to the Museum). " Bay of Islands, New Zealand, on the shores 

 of Parua Harbour, in holes in wood bored by Teredos " (Dana). 



6. Allorchestes Nilssonii. (Plate VI. fig. 4.) B.M. 



Amphitoe Nilssonii, Rathke, Beitr. zur Faun. Noricegens, Nov. Act. 



XX. p. 264 c. 

 Amphitoe Prevostii, Rathke, I. c. p. 81, pi. 4. f. 5 (not Edwards). 



Liljcborg in Of vers, af Kongl. Vetcnsk.Akad. Forhandl. p. 22, 1851. 

 Allorcliestes Danai, Spence Bate, Brit. Assoc. Report, 1855 ; Ann, Nat. 

 Hist. Feb. ia57. 



Wliite, Ilanual of Brit. Crust, p. 163. 



Male. — The body is rather compressed. Eyes smaU, round. Superior 

 antennoe equal in length mth the peduncle of the inferior ; the 

 auditory cilia are not appreciable, and the hairs or spines are 

 arranged generally in bunches of three. Inferior antennae about 

 one-fourth the entire length of the animal ; the articulations not 

 longer than their diameter, except towards their extremities, and 

 furnished with short stiff spines ; the peduncle as long as the fla- 

 gellum ; the articulations of the pedimcle gradually decrease in 

 length and diameter ; the third is little more important than the 

 first of the flagelliun, which consists of eight or nine joints ; the 

 fu'st and second articulations of the peduncle are incorporated 

 with the head, but not so completely as in Talltrus and Ordiestia. 

 A small olfactory denticle is present. Second pair of gnathopoda 

 larger than the fii-st ; palm convex. 



Length ^ths of au inch. 



The coxai of the two pairs of gnathopoda and the two anterior 

 pairs of pereiopoda are nearly as broad as deep, and nearly as deep 

 as their respective segments of the body ; those of the three pos- 

 terior pairs of pereiopoda are much shorter than the preceding. 



The first pair of gnathopoda are smaller than the second ; the 

 dactylos is short, stout, and ciu'ved ; the propodos longer than broad, 

 the palm slightly receding and convex ; the carpus is much shorter 



