1985.] 



NATURAL SCIENCES OF* PHILADELPHIA. 175 



c 3 . Second legs remarkably shortened (carpal joint and hand to- 

 gether not longer than the merus). Gills seven. 5 



d l . Second legs chelate Pontophilus. 



d 2 . Second legs not chelate Sabinea. 



& 2 . Eyes wanting. Second legs not chelate, rather robust, with 

 fringes of long, plumose setas A spiny median crest on the cara- 

 pace Prionocrangon. 



■a.,. Several pairs of legs wholly obsolete. Rostrum elongated. 



Paracrangon. 



PONTOCARIS Bate, 1888. 

 Bate, Challenger Macrür. 1888, p. 495. 



Very nearly allied to Grangon, especially to Sclerocrangon. 

 Second periopoda not remarkably shortened, carpus and palma 

 together longer than the merus. Six pleurobranchise (i-o) and one 

 podobrauchia (h) present (see Bate, 1. c, p. 496). Carapace with 

 seven keels, the five uppermost dentate. Abdomen sculptured. 



a x . Anterior lateral angles of carapace projecting forward. Rostrum 

 acuminate P. propensalata. 



a 2 . Anterior lateral angles of carapace obliquely directed outward and 

 forward. Rostrum bidentate .... P. pennata. 



1. Pontocaris propensalata Bate, 188S. 

 Bate, Challenger Macrur. 1888. p. 496, pi. 90, figs. 2, 3, pi. 85, fig. 5. 



Geographical distribution: Ki Island, near New Guinea, 140 

 fath. (Bate). 



2. Pontocaris pennata Bate, 1888. 

 Bate, ibid., p. 499, pi. 91. 



Geographical distribution: Arafura Sea, 49 fath. (Bate). 



CRANGON Fabricius 1798 (restrict). 



Fabricius, Suppl. Entomol. Syst., 1798, p. 409 (pr. part). Kingsley, Proceed. 

 Acad. Nat. Sei. Philadelphia, 1879, p. 412. 



Second perciopoda not remarkably shortened, with chelae. Eyes 

 present, free. Five gills present: four pleurobranchise (1. m. n. o.), 

 one arthrobranchia (k.). 6 



5 The number of gills has not been examined in all species. I found fiye 

 gills in: Grangon boreas, salebrosns, intermedins, typicus, affinis. francis- 

 corum, Nectocrangon lar, and seven in Pontopliilns norvegicus, Sabinea 

 septemcarinata. By other authors (Bate, Smith) are recorded five in Crangon 

 agassizi, and seven in Pontocaris propensalata, pennata. Pontophilus bre- 

 virostris, abyssi, challetigeri, Sabinea hystrix. 



6 Smith records in Cr. agassizi a pleurobranchia on k, but no arthro- 

 branchia. The branchial formula given by Bate (1. c, p. 482) is certainly 

 wrong. 



