Boone, Crustacea, Cruise of "Alva," 1931 165 



The first pair of legs are chelate, moderately long, with the car- 

 pus one and one-half times as long as the related hand, an item 

 which sets this species apart from P. tridentata. The fingers are 

 slender, slightly longer than the palm, tapered, meeting through- 

 out their length and set with numerous tufts of bristles on both 

 lateral surfaces near the tips. 



The second pair of legs or great chelipeds are distinctly larger 

 than the first and differ also in that the carpus, which is obconic 

 is only one-half as long as the merus, or one-half as long as the 

 palm, which is compressed cylindrical, not dilated, being some- 

 what higher than wide ; the spine at the distal upper end of the 

 merus is quite small; the fingers are slender, as long as the palm, 

 tapered, with tips overlapping, meet throughout their length ; the 

 cutting edge of each finger is produced along the outer margin 

 into a laminate carina which, on the upper finger, bears a low 

 molar proximally, and on both fingers is finely, irregularly serrate. 

 The fingers are also beset on both lateral faces along the margins 

 of the cutting edges with long bristles, near the tip these become 

 more numerous, intermeshing, sieve-like. 



The third, fourth and fifth pairs of legs are very slender, with 

 elongated ischium and merus, the ischium is 0.6 as long as the 

 merus ; the carpus is 0.5 as long as the merus and produced into a 

 blunted process on the dorsal side ; the propodus is twice as long 

 as the carpus and is armed on the inferior lateral margin with 

 six rather widely spaced, slender, acute, articulated spines; the 

 dactyl is approximately one-sixth as long as the propodite and is 

 slender, curved and definitely biungulate, the two distal apices 

 being very strong, the inferior one only a trifle shorter than the 

 superior outer apex. 



References : Palaemonella longirostris, Borradaile, L. A., Ann. 

 Mag. Nat. Hist., ser. 8, vol. XV, p. 210; Trans. Linn. Soc. 

 London Zool., ser. 2, vol. XVII, 1914-21, p. 359, pi. 53, fig. 5. 



Genus: PERICLIMENES Costa 



Subgenus: Ancylocaris Schenkel 



Periclimenes (Ancylocaris) spiniferus de Man 



Plate 44 



Type : Dr. de Man's type series, originally described as a sub- 

 species of P. petitthouarsii Audouin and Savigny, was collected 



