394 PERCY SLADEN TRUST EXPEDITION 



Conchodytes domestica, Eathbun, Bull. U. S. Fisli Comm. 1900, ii. p. 122 (1901). 

 Bahamas, S.E. United States, in Pinna. Porto Santo, in Pecten (Brit. Mus.). 



4. Conchodytes margarita (Verrill), 1869. 



Pontonia margarita Smith, Verrill, Amer. Nat. iii. p. 245 (1869). Lockington, 

 Bull Essex Inst. xi. p. 163 (1878). 



Conchodytes margarita, Rathbun, Dec. Crust. N.W. America, p. 34 (1904). 

 Panama, in Margaritophora Jimbriata. 



5. Conchodytes hiunguiculata (Paulson), 1875. 



Pontonia hiunguiculata, Paulson, Crust. Red Sea, p. Ill, PL 15, fig. 1 (1875). 

 Conchodytes hiunguicidata, Nobili, Ann. Sci. Nat. (9), iv. p. 67 (1906). 

 Red Sea. 



Genus Typton Costa, 1844. 



Ann. Ac. Aspir. Nat. Napoli, ii. ; Faun. Regn. Napoli, ii. i. (1846). Heller, Crust, 

 stidl. Eur. p. 254 (1863). Bate, Ann. Mag. Nat. Hist. (4), ii. p. 119 (1868). Kingsley, 

 Proc. Ac. Philadelphia, 1879, p. 422 (1880). Carus, Prodr. Faun. Medit. i. p. 475 

 (1885). Ortmann, Speng. Zool. Jahrb. Syst. v. p. 508 (1890) ; Bronn's Thierreich, Arthro- 

 poden, V. ii. p. 1131 (1899). Borradaile, Ann. Mag. Nat. Hist. (7), ii. p. 390 (1898). 



Pontonella, Heller, Verb. zool. -hot. Ver. Wien, vi. p. 629 (1856). 



Definition : Body stout, compressed ; sixth abdominal segment not elongate ; rostrum 

 short, compressed, bent upwards at free end, pointed, with few or no teeth ; outer 

 flagellum of antennule short, not cleft; antennal scale vestigial ; second maxilliped 

 without podobranch, with last joint mediad of preceding joint ; third maxilliped without 

 arthrobranch, with narrow endopodite; legs fairly stout, one of the second pair with a 

 very large chela, the dactylopodites of the last three much or little curved, biunguiculate, 

 without basal protuberance. 



Key to the species of Typton : 



I. Rostrum toothless. Dactylopodites of last three legs not strongly curved. 



T. spongicola Costa, 1844. 



H. Rostrum toothed. Dactylopodites of last three legs strongly curved. 



T. bouvieri Nobili, 1904. 



1. (Type.) Typton spongicola Costa, 1844. 



Ann. Ac. Aspir. Nat. Napoli, ii.; Faun. Reg. NapoU, ii. i. PI. 6, figs. 1 — 6 (1846). 

 Grube, Ausflug nach Triest, pp. 65 and 125. Heller, Crust, siidl. Eur. p. 254, PL 8, 

 figs. 12—17 (1863). Norman, Ann. Mag. Nat. Hist. (4), ii. p. 176 (1868). Carus, 

 Prodr. Faun. Medit. i. p. 475 (1885). Ortmann, Speng. ZooL Jahrb. Syst. v. p. 508, 

 PL 37, fig. 8 (1891). Borradaile, Ann. Mag. Nat. Hist. (7), ii. p. 390 (1898). 



