:]r)2 THE REV. T. R. R. STEBBING OX 



1881. Djpjainene darioinil Miei's, P. Z. S. Loud. p. 70. 



1884. Ci/iiwdocea danviiiii Studer, Abli. K. Ak. Wiss. Berlin, 



1883, p. 18, pi. 2. figs. 6, 6 a, 6 h. 

 188G. „ dannlni Beddanl, Rep. Voy. 'Challenger,' 



vol. xvii. pt. 48, p. 150. 

 1891. ,, (larirlnii Dollfus, Miss. Cap Horn, Crustaces, 



p. 65, pi. 8. figs. 8, 8 «, 8 h. 

 li)ll. ,, dnrioini Ortmann, Princeton Univ. Exp. 



Patagonia, p. 649. 

 Hansen in his treatise on the Spha^roniida^ is evidentl}' alluding 

 to this species when he says (p- 125). "According to kind 

 information fr-om Dr. Caiman, J). Darininii (Cunningham) has 

 exopod of jdp.^ divided by an articulation ; the species nnist, in 

 my opinion, be estal)lished as a new genus near Paracerceis.'" 

 On this i-ecommendation I have acted, naming the genus after 

 Mr. Vallentin, to whose researches I owe the opportunity of 

 examining the species. An interesting feature is the dilatation 

 at the fifth per?enn segment, well marked in Cunningham's figure, 

 «.nd noticed by Dollfus but scarcely appreciable in his coloured 

 drawing of an example 19 mm. long. The specimen I have had 

 under observation measnred only 9 mm. The apical emargination 

 of the telsonic segment is squared at the base. The epistome is 

 not like the figure given by Dollfus; it Avidens mnch more 

 abruptly backwaitls, and then narrows before forming the divergent 

 arms which clasp the upper lip. The mouth-organs nre mnch as 

 in Cyinodoce. The first antenna^ have a very large first joint 

 followed by a short one, to which succeeds one that is long and 

 slender. The first gnathopods are rather i-obust, but as DoUfns 

 notices, the large tooth produced from the base of the hand is no 

 doubt a male character, giving to that sex in this genus a pair of 

 prehensile hands. 



In his enbranchiate group Hansen ma.kes an informal separn tion 

 between the genera which have and those which have not an 

 articulation of the exopod in the third pleopod. In the present 

 species the nrticnlation is very conspicuous, through the sti-ong 

 incurving of the inner margin of each joint at tlie junction ; the 

 exopod itself is mmsnally narrow. The fourth and fifth pleopods, 

 in accord with their systematic position, have both rami sti'ongly 

 pleated. Tliei^e are five of the denticulate bosses on the end of 

 the exopod in the fifth pair ; the exojiod of the fourth pair is 

 clearly two-jointed. 



Locality. Stanley Hai'ljour, low watei*. 



Tribe VALVIFERA, 



Fam. A s T A c I L L I D .1^.. 



1897. AstaciUidfP Sars, Crustacea, of Norway, vol. ii. p. 88. 

 1901. „ Ohlin, Svenska Exp. MagellanslUnd. vol. ii. 



p. 2G5. 



