MACRURA. SCII MITT. 323 



group, characterised by the absence of lateral marginal 

 spines, all the species, so far as known, have the fifth 

 pair of legs without exopodites, while the merus joint 

 of the same legs in the male has a notch and a spine or 

 tooth near its proximal end. A single exception is 

 P. deschampsi Nobili 9 from Pondicherry and Make, 

 which species Alcock thinks "may possibly be the non- 

 adult form of M. monoceros"' (Alcock, loc. cit., p. 49). 

 This has no notch or spine on the merus of the fifth 

 pair of legs. Of the species belonging to this first group, 

 only P. monoceros appears among the "Endeavour" 

 specimens. 



The second group is represented by a new species, 

 and the familiar P. stridulans, which proves to be the 

 long neglected P. novir-guinecv of Haswell. Penceopsis 

 macleai/i Haswell 10 also belongs here. Of this species 

 I have been able to examine a cotype and several other 

 specimens, male and female. It belongs to that section 

 of this second group in which the males have the meri 

 of the fifth legs notched, as they are in P. monoceros. 

 The adult male of our new species possesses such a notch, 

 \vhile in P. n<>r<r-<jn\n<'(r Haswell it is lacking. 



NOTE ox SOME SPECIES OF Parupcnceus, AND THE 

 CHARACTERS OF THE GENUS. 



I take this opportunity of supplying a few brief com- 

 ments upon some species of Parapenceus available to me 

 in the United States National Museum. These were 

 examined, both for the purpose of determining the 

 correct generic position of the species assigned to 

 Parapemeus by Smith, and to ascertain some information 

 not hitherto published regarding them. 11 



It would seem that the genus Parapcnwus should 

 be restricted to those forms possessing characteristic 

 suture lines described by Alcock 12 as "a longitudinal 

 suture . . on either side extending from the 

 orbital to the posterior border of the carapace, and also 

 a vertical suture extending across the branchiostegite at 



9 Boll. Mus. Torino, xviii., 1903, No. 452, p. 2, fig. 1. 



1U Haswell, Proc. Linn. Soc. X.S.W.. iv., 1, 1879, p. 40; Cat. 

 Austral. Crust. 1882, p. 201. 



II Cf. De Man, "Siboga 1 ' Bxped. xxxix.a. Deeapoda, pt. i., Penseidse', 

 1911, p. 78. 



la Cat. Indian Decapod Crust., 1906, pt. Hi., fasc. i., p. 30. 



