I. '08. 87 



mnning backwards along the inferior edge of the carapace for 

 nearly three-quarters of its length, and a second running ver- 

 tically down from the cardiac region to meet the first pos- 

 teriorly ; a red stripe runs the whole length of the rostrum. 

 The abdomen, in addition to the small spots already men- 

 tioned, shows several lateral, oblique, forwardly directed 

 orange stripes. The eyes are greyish black and the antennal 

 scale is transparent except for a red streak along its inner edge. 

 The two terminal joints of the outer maxillipedes are some- 

 what yellowish; the thoracic legs are finely spotted with red, 

 the two basal joints of the fourth pair being entirely bright 

 red. The telson and uropods are rather more thickly spotted 

 with chromatophores of the same red colour. The eggs are 

 pale green. In specimens from shallow water the red colour- 

 ing is, as a rule, very much less evident than in those taken at 

 greater depths.^ 



^ia:^.— Wollebaek (1908) states that P. Montagui attains a 

 length of 16 cms. off the Norwegian coast. In Irish waters it 

 is rarely found to exceed half this length. 



Among half a bucketful of small P. Montagui trawled off" the 

 mouth of Dublin Bay in October, 1906, a single specimen was 

 observed with a very abnormal rostrum (PI. X, fig. 8). This 

 specimen, which measures 31 mm. in length, is in all essential 

 features identical with the form described and figured by 

 Kinahan under the name of Pandahis leptorhynchus. I am, 

 therefore, enabled to confirm Caiman's suggestion (1899, p. 

 36) that Kinahan' s species was founded on an aberrant speci- 

 men of P. Montagui. 



Like Crangon vulgaris this abundant species is not commer- 

 cially fished in Ireland. In England its capture forms the 

 basis of a very considerable trade ; it is known in Liverj)ool as 

 the " shank," in the Humber as the " prawn," while in the 

 London markets it is usually termed the "pink shrimp." 

 Fishermen, of course, do not recognise the distinctions be- 

 tween this form and P. Bonnieri. 



The life-history of P. Montagui is of great interest, but is as 

 yet by no means fully understood ; still there seems to be no 

 doubt that for a considerable portion of its existence the species 

 is gregarious and migratory. Late in spring large assemblages 

 of P. Montagui travel shorewards ; they remain in shallow^ 

 water throughout the summer and autumn ; but in November 

 and December, at a time when the females are just beginning 

 to bear eggs on their pleopods, they journey outwards again to 

 depths of 20 to 30 fathoms, where they stay until the close of 

 the breeding season. 



Mr. Holt has noticed a specific instance of this in the 

 Humber Estuary, to which P. Montagui regularly resorts 



1 This applies even to small differences in depth. For instance, in the 

 Humber the catch from a 10-fathom haul is always much redder than 

 that from the shallower grounds (teste Holt). 



