I. '08. 



155 



from Loch Tarbert and from the Shetlands,i by Scott (1902) 

 from the Firth of Forth, and by Patience (1908) from the 

 Firth of Clyde. It is known also from the S. coast of Iceland 

 (Hansen) and has been found on the N. side of the Bay of 

 Biscay (Kemp). 



Irish distribution.'^ — Only on one occasion has this form 

 been found off the Irish coast : — 



Helga. 



R.S.— 3/5/'05.— 16i miles S.W. of Coningbeg Lightship, off 

 Co. Wexford. 40 fathoms. Trawl. Temperature 

 at 38 fathoms, 89^ C, salinity 35-037oo--Four, 13^— 

 15 mm., three $ ovigerous. 



Vertical range. — Off Norw^ay this species has been found 

 between 2 and 6 fathoms and on the Scotch coast between 

 8 and 10 fathoms. Hansen records it from 20-45 fathoms in 

 the neighbourhood of Iceland and it has occurred in 75 fathoms 

 in the Bay of Biscay (Kemp). 



Genus Aegeon, Guerin Meneville. 



Eg eon, Risso, 1816. 

 Pontocaris , Spence Bate, 1888. 



Rostrum depressed ; longitudinal dentate carinae on both 

 carapace and abdomen. Eyes present. Lateral process of 

 antennules distally pointed. First pair of pereiopods with a 

 setose exopod ; second pair chelate, reaching slightly beyond 

 carpus of, or nearly as long as, first pair, dactylus about one- 

 third the length of propodus, carjDus shorter than ischium ; 

 dactylus of fourth and fifth pairs not laminar. Endopod of 

 last four pairs of pleopods only slightly shorter than exopod, 

 one-jointed and with appendix interna at base. Inferior 

 apices of branchiae turned forwards, giving the whole gill a 

 characteristic C-shaped appearance. Formula : — 





VII. 



vin. 



IX. 



X. 



XI. 



XII. 



xni. 



XIV. 



Podobranchiae, 



ep. 



1 + ep. 



... 



... 





A.rthro branchiae, 







1 



... 







... 



... 



Pleurobranchiae, 







1 



1 



1 



1 



1 



1 



1 1 am indebted to Canon Norman for the information that these Shet- 

 land specimens, which he recorded in 1869 as Crangon fasciatus, are in 

 reality (a^ he suggested in 1887) examples of neglectus. 



2 Mr. A. 0. Walker has very kindly allowed me to examine the speci- 

 mens recorded by him from Valencia (1898, p. 163) as Crangon neglectus. 

 These specimens, three in number, are of extremely small size, ca. 7 mm.; 

 they, however, show distinct traces of lateral tubercles, and I strongly 

 suspect that they are only yoimg specimens of typical P. bispinoaus. 



