n6 



DISCOVERY REPORTS 



the case of the Terra Nova collection. Some of the views on synonyms expressed in that 

 report (1930) have been changed, and I cannot claim that even now the conceptions of 

 the different species have reached a satisfactory finality. 



A detailed analysis of the members of this family should prove an interesting study 

 to one favoured with the opportunity of making direct comparisons of all the Antarctic 

 material now available in Europe. One of the essentials of such a study will be the 

 comparison of the mouth-parts. 



As regards variation, some details were given in the Terra Nova Report, viz. the 

 anterior side-plates in certain species. The integumentary processes may be divided into 

 primary and secondary armature. For example, the denticles on the peraeon and pleon 

 of E. echinata (recorded in the report referred to as nodosa) may be termed secondary 

 armature; and this armature is subject to considerable variation. 



On the other hand, the paired dorsal processes and the medio-dorsal carinal teeth 

 may be termed primary armature; this appears to be subject to very little variation and 

 to be truly specific in character. It can be safely asserted that the number of paired 

 dorsal processes does not increase with age. I have examined all available embryos (or 

 rather juveniles) in the brood-pouches, and find that the number does not differ from 

 that of the adult, with the one exception of Acanthonotozometta oatesi. 



The following synopsis based on the paired dorsal processes may facilitate identification : 



No paired dorsal processes 

 One pair „ „ 



Three pairs 



Four pairs 



Five pairs 

 Eleven pairs 



Pariphimedia normani (Cunn.) 



Pariphimedia integricauda, Chevr. 



" Iphimedia " pacifica, Stebb. 

 Iphimediella bransfieldi, n.sp. 

 Gnathiphimedia sexdentata (Schell.) 

 G. macrops, n.sp. 

 Maxilliphimedia longipes (Wlkr.) 

 Anchiphimedia dor salts, Brnrd. 

 Panoploea joubini, Chevr. 

 P. macrocystidis, n.sp. 



Iphimediella margueritei , Chevr. 



/. cyclogena, Brnrd. 



/. microdentata, Schell. 1 



/. rigid a, Brnrd. 



/. nodosa (Dana) 



Gnathiphimedia mandibularis, Brnrd. 



Labriphimedia vespuccii, Brnrd. 



f" Iphimedia" serrata, Schell. 



I Labriphimedia pulchridentata (Stebb.) 



Acanthonotozomella oatesi, Brnrd. 



1 IntheTerra Nova Report I placed microdentata, Fichc\\.,asasynonymof margueritei, Chevr. DrSchellen- 

 berg has informed me, however, that microdentata is the same as my brevispmosa and thus has dorsal processes 

 quite unlike those of margueritei. My mistake was, I think, pardonable, as the description of microdentata 

 said that it resembled margueritei in habitus and no mention was made of the dorsal processes. /. brevispinosa, 

 therefore, on Schellenberg's authority, becomes a synonym of microdentata. 



