558 PROCEEDING'S OF THE NATIONAL MUSEUM. vol. 50. 



granules, the posterior tubercle situated on the postero-lateral mar- 

 gin considerably above the lateral angle ; from this postef ior tubercle 

 a line of granules curves (concave backward) toward the summit of 

 the cardiac region ; on the outer slope of the branchial region there 

 is an obliquely longitudinal line of granules. Front deflexed at an 

 angle of about 45 degrees, channeled, margin crenulate, extremity 

 triangular and blunt-tipped, bearing a small, rectangular tooth on 

 either side. Upper margin of orbit with a tooth close to the one at 

 the outer angle; lower margin w^ith 3 additional teeth, the inner one 

 the most prominent. The lateral margins of the carapace are par- 

 allel and denticulate for a short distance behind the orbital angle, 

 after which the hepatic margins are gently convex and bear 3 or 4 

 denticles; the branchial regions are bordered with 6 or 7 teeth up to 

 the lateral angle, where the last tooth is a little enlarged. The 

 postero-lateral margins bear 2 teeth or tubercles each side of the 

 branchial ridge; there are 5 tubercles on the posterior margin. All 

 the marginal teeth of carapace and chelipeds are denticulated. 



Through the middle of the outer maxillipeds there is a line of 

 granules. 



Chelipeds moderately contorted, twice as long as carapace ; merus 

 irregularly dentate on anterior and posterior margins, 3 teeth no- 

 ticeably large on the anterior margin, 2 on the posterior margin, the 

 distal one of these being terminal, flattened and rounded at the end, a 

 row of teeth on upper surface ; lower edge finely dentate ; lower sur- 

 faces partly granulate. Carpus with 2 lobes on outer edge. Manus 

 much wider in the right cheliped, its upper surface widest at about 

 the distal two-fifths, the margins of the same irregularly lobed or 

 toothed, 4 larger lobes on outer (posterior) edge and 3 on inner 

 (anterior) edge; lower edge bordered by many small teeth; surfaces 

 nearly smooth. 



Ambulatory legs very slender; the merus joints have a few small 

 tubercles on the margins, also the carpus and propodus of the last 

 pair. 



P. (P.) parva has much in common with P. (/?.) longispina^ 

 (specimens of equal size compared), having similar shape of hind 

 part of body and of chelipeds, and similar ornamentation, but the 

 new species has the hepatic region much less protuberant, the larger 

 projections of the carapace are tubercles, not spines, the chelipeds 

 are shorter and lack tubercles on the lower surface, while the tuber- 

 cles of the legs are much feebler. 



1 Lambrus lonyispinus Miers, Ann. Mag. Nat. Hist., ser. 5, vol. 4, 1879, p. 18. 



