1900.] FEOM THE FALKLAND ISLANDS. 567 



EXPLANATION OF THE PLATES. 



Plate XXXVI. 



A. Halicarcinus ovatus, p. 523. 



n. s. Natural size of carapace, breadth measured at widest part of rim, length 



from middle rostral tooth to posterior margin. 

 E. Rostral teeth. 

 PI. Pleon of male. 

 on., on. Mandibles, outer surface. 



onx. 1. First maxilla, with spine-margins more highly magnified. 

 onxp. 3. Third or external maxilliped, inner surface. 

 prp. Terminal joint of a trunk-leg or perseopod, with apical part more highly 



magnified. 

 pip. cf. Pleopod of male. 



B. Halicarcinus planatus, p. 524. 



n. s. Natural size of carapace, measured as in preceding species. 

 B. Rostral teeth. 

 on. Mandible, inner surface. 

 onx. 2. Second maxilla. 



mxp. 1. First maxilliped, with apex of endopod more highly magnified. 

 mxp. 2. Second maxilliped. 



mxp. 3. Third or external maxilliped, inner surface. 



prp. Terminal joint of a trunk-leg or peraeopod, with apical part more highly 

 magnified. 



Plate XXXYII. 

 Euphansia vallentini, p. 545. 



Op. Lateral and hind margins of carapace. 



Pl.s. 3. Postero-dorsal tooth of third pleon-segment. 



p.s. Preanal spine, p.s* The same, from another specimen. 



a.s., a.i. Eye, together with first antenna, second antenna, and rostral point. 



on.., on. Mandibles. 



Li. Lower lip. 



mx. 1, mx. 2. First and second maxilla;. 



mxp. 1,2, 3. First, second, and third maxillipeds, without branchial append- 

 ages, the third also without exopod. Apex of second maxilliped more 

 highly magnified. 



prp. 1,2,3. First, second, and third peraeopods, without exopods or branchiae. 



exop. A detached exopod. 



oirp. Uropod. 



T. Telson. Apical portion and one subapical process more highly magnified. 

 The mandibles, lower lip, first and second maxillae, preanal spines, apex of 



second maxilliped, and apex of telson are more highly magnified than the 



other figures, but the figures in each group are all to the same scale. 



Plate XXXVIII. 



Iais pubescens, p. 549. 



n.s. Line showing length of specimen figured. 



a.s., a.i. First and second antennae. 



l.s. Upper lip. 



m.,?n. Mandibles. 



l.i. Lower lip. 



mx. \,mx. 2. First and second maxillae. 



mxp. Maxillipeds. 



gn. I, prp. 5. First gnathopod and fifth peraopod (first and seventh trunk-legs). 



PI. The seinipellucid pleon. 



urp. Uropod. 



The mouth-parts, fingers of trunk-legs, and one uropod are magnified to the 

 same scale, except the apices of mx. 1 ; the other details are less enlarged. 



