230 Soiitlicyti Cross. 



Family PERICERIDAE. 



Prionokiivnchus Edwaudhi. 



Prionorhynchus Edwardsii, Jacquiuot aud Lucas, Voyage au IVile Sud, 

 Zoology, vol. iii. (IM.").'!), Crustacea, p. 8; Itathbun (25, p. 243). 



A single s])ecimen of tliis s])ecies was taken at the Auckland 

 Islands on Dnmont d'Urville's voyage to the South Pole, and u\n)n 

 this the genus was established. The genus is characterised by tlie 

 de])ressed lamellate and emarginate rostrum. In describing the .species, 

 MM. Jacquinot and Lucas allude to a second specimen, a female, in tiie 

 possession of the iJritish Museum, and it would appear that their figure 

 was drawn from this specimen. The figure in (piestion is admittedly 

 defective ; the tubercles on the carapace arc much too prominent, 

 wliilc the rounded elevations with which they are associated are not 

 indicated, neither is the granular nature of the appendages shown. 



Two specimens, <J and 9 . occur in the National collection, but 

 nothing is stated as to the locality from which they were obtained. 

 The ' Southern Cross ' specimens, three in number, were taken at the 

 Campbell Islands in 1898, and are all much larger than the 

 specimens alluded to al)ove. The carapace and the greater part of 

 the appendages are concealed by a dense incrustation of Tolyzoa, 

 and in addition to thi.s, on the two smaller specimens, there is an 

 interesting growth of a stout foliaceous green alga. These growths 

 \ery largely conceal many details of structure, but there can be no 

 doubt as to the identity of the species. The granular character of 

 the lim])s, which has been made a specilic character, is practically 

 al)Sent, l)Ut enough remains on the female specimen to show that 

 this feature is doul)tless dependent on age. Another point to Mhich 

 it is desirable to call attention is the abdomen of the 9. In the 

 specimen in the National collection the abdomen is narrow, and 

 scarcely covers more than hall" of the sternal area, whereas in the 

 ' Souther It Cross ' si)ecimen the aljdomen is much broader, and entirely 

 occu])ies the sternal area. This latter specimen bears ova, the 

 condition of which indicates they were not far from hatching. 



1 i . Size of carapace, 160 X 135 mm. 



2 (J . Size of carapace, 133 X 114 mm. Two legs and a chelii^ed 

 missing. 



3 9 . Size of carapace, 114 x 102 mm. I>oth chelipeds missing. 

 Bearing ova. 



Distribution. — This species is only known from the Campbell 

 aud Auckland Islands. 



