560 PROCEEDINGS OF Till: NATIONAL MUSEUM. vol.38. 



its upper margin and the extremities of its lower and lateral margins 

 very finely denticulate ; a short spine on either side of the base of the 

 rostrum, and also at antero-lateral angles; a few spinules on anterior 

 side margin. Corneae large, reniform. Chelipeds narrow, not twice 

 length of carapace, rough with spinules; spines at distal angles of 

 arm and wrist : palm twiee as long as wide, fingers longer than palm, 

 not gaping. First three legs rough, margins hairy. Abdomen trans- 

 versely striated and ciliated, unarmed; swimming fan broad. 



Length of carapace of type male 18.8 mm., length of entire animal 

 extended 60 mm. 



Lobos <le Aiuera, March, 1907. "Cameron del Mar." 



"Camerones del Mar'' (red), casually very abundant, Callao Bay, June, 1908. 



Typt -locality. — Callao Bay. 



'/'•//« - Cat' No. 40484, U.S.N.M. 



(iuerin " says that this species is so abundant in the roadstead of 

 Callao that it gives the water the appearance of blood. 



PANULIRUS ORNATUS ( Fabricius). 



Plate 52, fig. 1. 



Palinurus onm/us Kaihucics, Ent. Syst., Suppl., 1798, p. 400. 

 Palinurus fasdatus db Haw, fauna Japon., Crust., 1849, p. 159, pis. 43, 44, 

 fig. 2. 



A large lobster with carapace longitudinally subcylindrical and 

 spinous; orbits partially excavated; eyes stout; a long horn-like 

 spine behind each eye. Flagella of first antennae long and slender, the 

 segment that carries them produced considerably in advance of the 

 frontal margin and bearing four spines. Second antennae sub- 

 cylindrical, with strong, spinous, peduncular segments and long. 

 rigid multi-articulate ilagella. Five pairs of legs similar, third 

 longest ; not chelate, except fifth pair in female which is subchelate : 

 tips horny. First to sixth abdominal segments nearly smooth, 

 produced laterally to a spine; swimming fan spinulous. 



Length of body about 25 em.; length including antennae about 

 56 cm. 



Payta, April 27, 1907. "Langosta." 



Not previously known from Peru. 



Distribution. From Lower California to Peru; [ndo-Pacific region. 



BITHYNIS CjEMENTARIUS GAUDICHAUDII (Milne Edwards). 



PlatcT)!, fig. 1. 



Palemon gavAichaudii Mum: Edwards, Hist. Nat. Crust., vol. 2, is:;:, p. 100. 



fal;, iimn i/ii m/irl/n mil i Mil n i: EDWARDS ami LuCAS, <1 '< >rbign v's Vby. Anu'r. 



Mer., vol. 6, 1843, p. :*7; vol. 9, atlas, L847, pi. 17, fig. 2. 

 A river shrimp or prawn of large size. Body smooth, subcylin- 

 drical : abdomen diminishing posteriorly ; firsl t wo pairsof legschelate, 



a Voy. Coguille, vol. 'J. pt. -'. L831, p. 32. 



