Contributions to the Crustacean Fauna of South Africa. 381 



examined the type-specimen of Amesopous but failed to find the organ 

 in question, owing possibly, so he says, to the specimen not being fully 

 adult. 



Coming now to the new genus described below, Holidotea, we find 

 a form which in general facies is a true Idoteid, apparently belonging 

 to the group with dorsal eyes containing Mesidotea and Chiridotea, but 

 without the cleft margins of the head characteristic of these genera. 

 Rather unexpectedly, however, it has only a single median process and 

 a modified first pleopod, and is therefore far removed from, the true 

 Idoteids. On the other hand, peraeopods 2-4 are Idoteid in structure 

 and resemble somewhat those of Pseudidotea bonnieri. 



The relationships between the families are set out in the following 

 table : 



FAMILY PSEUDIDOTEIDAE. 



1901. Pseudidoteidae Ohliu. Sveuska Exp. Magellan, vol. 2, p. 276. 

 1905. ,, Stebbing in Herdman's Ceylon Pearl Fish. 



Suppl. Eep. 23, p. 43. 



HOLIDOTEA n. g. 



Head with lateral margins not cleft. Eyes dorsal. Side-plates 

 distinct on all segments except first. Pleou composed of a single 

 segment with two incomplete basal grooves. Flagellum of second 

 antenna 2-jointed. Inner plate of first maxilla with 3 plumose setae. 



