3' 



maxillipeds, but they recognize that in M. heteracantlia the eyes 

 are less dilated, and that there are some differences in the arma- 

 ture of M- propinqua, but they cannot find any disltinction between 

 M. militaris Henderson (1885) and his M- saucti-pauli. Hfender- 

 son himself had already made his M. vitiensis a synonym and re- 

 duced his M. cui'virostris to a variety of M- iiiilifaris. In M. 

 propinqua there seem to be more differences of armature than 

 those noticed by the French authors, and in M. militaris there are 

 a few- But if^ as those authors suggest, M. militaris and M. 

 sancti-pauli should be regarded as one species, M. inilttarts, 

 as the earlier name is the one that ought to stand, unless 

 that also ought to be superseded by M. miles A. Milne- 

 Edwards (1880). 



Locality: — Buffalo River north 10 miles. Depth, 310 fathoms. 

 Bottom, coral and mud. The greatest depth recorded is that of 

 a specimen taken by the Prince of Monaco at the Azores in 758 

 fathoms. 



Fam- : Uroptychidae. 



1892. Chirostylidae, Ortmann, Zool. Jahrb., vol. 6, p. 244. 



1 894. " Diptycines,'" A. Milne-Edwards and Bouvier, Ann. Sci 



Nat., ser. y, vol. 16, pp. 296, 312. 

 i8y6. Chirostylidae, Ortmann, Zool. Jahrb-, vol. 9, p. 433. 

 1896. Diptycinae, Bouvier, Bull. Soc. Eatom. FrancCj vol. 65, p. 



312. 



1900. Diptycinae, A- Milne-Edwards and Bouvier, Crust, decap. 



Travailleur et Talisman, p. 350. 



1901. Uroptychidae, Alcock, Catal Indian Deep-Sea Crust., 



Macrura and Anomala, p. 278. 

 The first name of the family was based on Chirostylus, a 

 synonym of the earlier Ptychogaster. The second claimant was 

 derived from the pre-occupied name Diptychus, for which 

 Henderson substituted Uroptychus, and that seems to form a 

 proper foundation for the name of the family, which has been 

 detached from the Galatheidae. 



Diptychus and Ptychogaster were both instituted by A. Milne- 

 Edwards in 1880, but the former took precedence- 



The characters distinguishing this family from the Galatheidae 

 are given by Alcock as follows : — 



" The telson, which is transversely fissured, is, along with the 

 caudal swinnnerets, folded beneath the preceding abdominal 

 somites ; the last thoracic sternum is more or less atrophied ; the 

 antennal peduncle is five-jointed, the third joint beincr quite dis- 

 tinct from the second ; the incisor edge of the mandible is 

 serrated ; no epipodites on any of the maxillipeds." It will be 

 easily understood that the folding in of the telson suggested the 



