Contributions to the Crustacean Fauna of South Africa. 429 



Ungues in all the peraeopods equal and strong, with a tuft of setae 

 at their base. 



Male appendages on 7th peraeon segment contiguous, short, 

 apices blunt. 



Marsupial plates overlapping. 



Pleopods narrow ; 4 hooked spines on inner apex of peduncle, 

 male stylet on 2nd pleopod half as long again as ramus, slender, 

 scarcely tapering, apex obliquely truncate. 



Uropods narrow, nearly parallel-sided, suture between peduncle 

 and ramus oblique, width of ramus equal to inner margin, 

 apex truncate, slightly emarginate, no seta on outer apex of 

 peduncle. 



Length: 3- 22 mm., 2 17 mm.; breadth: $ 3'5 mm., 

 5 4 mm. 



Colour: Greenish brown, often with a darker discontinuous 

 median stripe on peraeon segments. 



Locality: Smitswinkel Bay (False Bay). 5/7/12. (K.H.B.) 

 3 3$, 1 5 and 2 young; Buffels Bay (False Bay). 28/9/13. 

 (K.H.B.) 3 $ $ , 1 ? with ova ; Atlantic coast near Cape of Good 

 Hope. 29/9/13. (K.H.B.) J $ , ? 2 with ova, and young; 

 St. James, False Bay. 15/2/14. (K.H.B.) <?<?,?? with ova. 

 (S.A.M. Nos. A2469, A2525, A2526 and A2684 respectively.) 



Found on brown seaweeds at low-water mark. 



This species appears to be very close to Idotea elongata, Miers, 

 although there is considerable difference in the shape of the telsonic 

 apex. This difference is noticeable in comparing the Cape species 

 with Miers' figure (Cat. N.Z. Crust. 1876, p. 93, pi. 2, fig. 3), and 

 Dr. Caiman informs me that Miers' figure is a very fair representa- 

 tion of the actual type specimens. I am unable to give a detailed 

 comparison of the appendages owing to a want of specimens of 

 I. elongata, 



Dr. Caiman also informs me that the type specimens of I. elon- 

 gata in the British Museum have 1 complete and 2 incomplete basal 

 sutures on the pleon and are therefore referable to Paridotca. This 

 does not quite agree with Miers' description (J. Linn. Soc. 1881, 

 vol. 16, p. 54). " Postabdomen . . . having usually indications of a 

 lateral suture ..." Chilton has commented on the variability of 

 these sutures (Subant. Is. N.Z. 1909, vol. 2, p. 658) and says of 

 specimens coming, like the type specimens, from the Auckland 

 Islands: "The lateral suture on the pleon is often very indistinct, 

 so that the pleon is almost or quite uniarticulate." 



Seeing however that the type specimens show the distinctive 



