SOME NOTES ON THE SCOTTISH CRANGONID^ 229 



small and tapers gradually to the narrow but boldly-rounded apex. 

 The carapace is armed with two small spines on the median line, 

 one being situated a short distance from the base of the rostrum, 

 while the other is intermediate between it and the posterior margin. 

 The carapace is also adorned with numerous minute tubercles 

 arranged more or less in longitudinal lines, which look like indistinct 

 ridges, the principal one being in line with the two spines already 

 alluded to. The two median spines are more prominent in some 

 specimens than in others, and appear more distinct when the 

 carapace is viewed from the side ; the arrangement of the 

 tubercles is also more conspicuous when the specimen is partially 

 dried. 



Crangon nanus appears to be generally distributed round the 

 Scottish coasts. It has been recorded from the Firth of Forth 

 (Leslie and Herdman, and others) ; off Aberdeen ; the Firth of Clyde 

 (Robertson and myself) ; Shetland Islands (Norman, who describes 

 it as common in 40-50 fathoms 5-8 miles east of Balta; also Whalsey 

 Skerries Haddock Ground, and occasionally elsewhere). Two 

 females (with ova) which I measured did not exceed 1 1 mm. in 

 length. 



Crangon spinosus, Leach. — This and the next two species 

 have a spiniferous carapace. The rostrum in C. spinosus has a 

 strong spine on each side near its base, so that it has somewhat of 

 a trifid appearance ; its apex is bluntly rounded. The carapace is 

 armed with five spiniferous ridges ; the central ridge and the one on 

 each side of it usually extend close to the posterior margin, and 

 each is usually provided with three spines ; the other two ridges are 

 less complete. The last two segments of the abdomen are flattened 

 along the median dorsal line, the flattened part being bounded on 

 either side by a slightly raised border ; a second pair of raised lines 

 are observable on the same segments outside of those already 

 referred to, but these are indistinct unless in partly-dried specimens ; 

 the other abdominal segments are very faintly keeled. The telson 

 is flattened or slightly grooved. 



Crangon spinosus has been recorded from various Scottish local- 

 ities. It has not been recorded from the Firth of Forth or St. 

 Andrews Bay, but Sim obtained it off Aberdeen in 1871-72 ;* and 

 it has been taken in the same neighbourhood during the recent 

 investigations on behalf of the Fishery Board for Scotland. It is 

 one of the species recorded for the Moray Firth in Smiles' " Life of 

 Thomas Edward." It is described by Henderson as being "not 

 uncommon in the Clyde," and it is also one of the species recorded 

 by Alex. Patience ; 2 while in his Shetland Report Norman describes 



1 "Scottish Naturalist," vol. i. p. 184. 

 2 " Millport Mar. Biol. Stat. Communications" (Nov. 1900), p. 30. 



