igiy.] 



S. Kemp : Notes on Crustacea Decapoda. 



305 



subsp. norfolkensis, nov. 



1903. Xiphocai-is coiiipressa. Thomson, Trans, l^iiin. Soc. Zool. (2) V'lII, p. 



4+9 (part). 

 1907. Xipliocaris coiiipressa, Cirant and M cC uUoch, Proc. Linn. Soc. .V.^.H ., 



XXXII, p. 156. 



Specimens from both sides of Norfolk I., collected b}'' Messrs. 

 Laing, are in the Indian Museum. Examples from the east side 

 of the island are smaller than those from the west, but do not 

 appear to be distinguished by any other constant character. The 

 material examined does not bear out Grant and McCulloch's state- 

 ment that the rostrum is proportionately shorter in specimens 

 from the east side. 



The rostrum varies greatly in length and is frequently very 



Fio. 0. — Paratya (Uisfral ieiisis subsp. norfolkensis, nov. 

 a. First peraeopod. d. Dactylus of third peraeopod. 



b. Second peraeopod. 

 Third peraeopod. 



e. Fifth peraeopod. 

 /. Dactyhis of fifth perasopod. 



much shorter than in any other race of Paratya. In specimens 

 from the west side it reaches, in one instance, only to the end of 

 the second antennular segment, in others almost or quite to the 

 end of the peduncle and in one individual a little beyond the apex 

 of the scale. Among those from the east side the rostrum in one 

 case reaches barely beyond the end of the first antennular seg- 

 ment, in others to the end of the second segment, to the end of 

 the peduncle or a trifle beyond the apex of the scale. The upper 

 border bears from 21 to 32 teeth,' forming an uninterrupted series 

 from the base to the apex. The hindmost 2 to 5 teeth * are placed 

 on the carapace. On the lower border there are from 3 to S teeth ' 

 which almost always extend on to the distal third of the rostral 

 length and not infrequently reach almost to the apex. 



^ According to Thomson's observations liie leelh vary from 17 lo 34 above 

 and from 2 to 9 below. 



'^ 2 or 3, rarely 4, in specimens from tlie east side ; 4, rarely 5, in those from 

 the west. 



