I. '08. Ill 



The endopod of the plcopods is as usual rather shorter than 

 the exopod in the last four pairs and is provided with an ap- 

 pendix interna at its base. The outer uropods are slightly 

 longer than the inner; both are longer than the telson (exclud- 

 ing spines) ; the outer pair are rather more than three times 

 as long as broad and are setose along their outer margins. 



Size. — The largest specimen examined measiu-es 21 mm. ; 

 an ovigerous female is 18'5 mm. in length. Smith records an 

 example of 27 mm. 



Colour in life. — Transparent, with a thick sprinkling of 

 pure red chromatophores on the carapace and abdomen, the 

 colour being darkest on the rostrum. The gastric regions 

 are visible through the carapace as a greenish mass. The 

 eyes are black ; the antennal and antennular flagella are quite 

 transparent, but their peduncles and the antennal scale are 

 dotted with red chromatophores. The outer maxillipedes 

 are thickl}^ strewn with red pigment spots. The two basal 

 joints of each pereiopod are red ; the chela of the first pair is 

 outlined w4th a double row of red chromatophores (but is quite 

 transparent in the centre), and there is a very narrow red band 

 at the base of the chela of the second pair ; all the remaining 

 joints of the pereiopods are quite colourless and transparent. 



The Irish specimens of C. Gordoni have added very con- 

 siderably to our knowledge of the variability of the species. 

 The diverse forms of the rostral armature are paralleled in 

 the genera Hippolyte and Spirontocaris , but the variation in 

 the length of the lateral process of the antennules is perhaps 

 unusual. In the matter of the number of epipods present and 

 the spinulation of the telson the specimens examined show no 

 difference, although these features are by no means constant 

 in some of the more variable members of the family. 



It is worth noting that of the forty-five specimens in the 

 collection only two are adult males. 



General distribution. — Known in European waters from the 

 North Sea (Metzger), Denmark (Meinert), Sweden (Goes), S. 

 Norway to E. Finmark (Sars and Norman), Iceland (Hansen) 

 and off the Scotch coasts from the Shetlands, Loch Fyne, 

 Moray Firth and off Aberdeen (Norman and Scott). I have 

 recently examined specimens collected by the Huxley on the 

 N. side of the Bay of Biscay, which is the most southern 

 locality in which the species has been found in the N.E. 

 x^tlantic. In the West Atlantic it has been frequently found 

 off' the American coast, north of Cape Cod (Smith). 



Smith (1879) states that the species is only found on hard 

 or rocky bottoms in fairly deep water, and Sars (1882) has 

 found it frequently off the west coast of Norway in the region 

 of the deep-sea corals. 



Irish distribution. — There seems no ground for the belief 

 that C. Gordoni is restricted to a rocky bottom round the Irish 

 coasts, although it has occurred in such localities. Deep-sea 

 corals {Lophohelia, etc.) have not often been found off the 



