VI 



BRACK YUKA OXYSTOMATA 



I8 5 



and Lutreillia, widely distributed, occur in the Mediterranean. 

 Latreillopsis from the Pacific, L. pettcrdi, 1 a magnificent species, 

 with the carapace nearly a foot long, and with very long legs 

 like a Spider-crab, has been dredged from 800 fathoms east of 

 Sydney, New South Wales. 



Tribe 2. Oxystomata. 



This group comprises Crabs whose carapace is more or less 

 circular, while the mouth, instead of being square as in tin- 

 remaining Brachyura, is triangular with the apex pointing for- 

 ward, and the third maxillipedes are not expanded into the 

 flattened, lid-like structures found in other Crabs. There is tin- 

 same tendency in some of the genera for the posterior thoracic 

 limbs to be reduced and carried dorsally, as in the Galatheidae 

 and Dromiacea, The well-known Dorippe from the Mediterranean 

 IMS this feature, and frequently carries an empty shell upon its 

 back, and Cymonomus' 2 presents the same peculiarity. 



Cymonomus granulatus (Fig. 127) is an abyssal form that lias 



KM;. TJ~. Cymonomus granulatus, x 1. A.I. .1..', 1-t .'mil 'Jin I antennae 



k : >', i-\t.i-:i-urliit;il spine of Carapace. I M'l' ) I. .mkr.strr.) 



been dredged from tin- Mediterranean and Xn li A I lain ie. in \\ In'di 

 the eye-stalks are curiously tuberculated, and the mnmalidia of 



1 M'Cullocli. /,'('. .lnfi//-ii/iii Mi/*. \\. |i.ui :. T.i'ir. ) 

 ' J Lankestcr, V'"" 7 - ' Micr. Xci. xlvii.. I'.'O-J, p. 439. 



