400 CRFSTACEA OF NORTHrMBERLAND AND DURHAM 



abdomen four-jointed, the joints very short and nearly equal 

 in length ; caudal stylets short, quadrate, scarcely longer 

 than broad, sharply angulated at the outer distal edge ; 

 bearing one long rigid apical seta and two very small ones. 

 Antennules short and stout, six-jointed, the terminal joint 

 bearing four setae; mandibles small, consisting of a single 

 stout curved limb without any palp ; maxillce simple, clavi- 

 form, dilated at the extremity, which bears a few simple setae ; 

 anterior maxillipeds bearing a very long and slender terminal 

 claw ; posterior similarly formed, but with a much shorter and 

 more robust unguis ; three pairs of swimming feet, each with 

 a robust basal joint, and two tri-articulate branches. The 

 siphon is apparently slender and tubular, but was only 

 indistinctly seen. The animal is nearly colourless, except 

 that the alimentary tract is coloured so as to form in the 

 recent condition a brilliant blue cross. Three specimens were 

 taken by A. M. N. in a brackish pool by the side of the 

 stream at Seaton Sluice in June, 1885, but renewed search in 

 the same place has failed to disclose further specimens. The 

 animal is evidently a suctorial one, and doubtless a parasite 

 which in this case had become detached from its host. No 

 species at all nearly corresponding to it has apparently been 

 described. Its nearest allies are probably CanceriUa Dalyell 

 and Botryllophilus Hesse, and it would appear not at all 

 unlikely that the host may prove to be one of the Amphipods 

 or Isopods which abound in salt marshes, or possiVily the 

 shore crab. N. 



Fam. 3.— ONX^ID^ 

 Onc^a anglica G. S. Brady. 



1905. Onccea auglica, Brady, On Copepoda and other 



Crustacea taken off Northumberland and Durham in 



July, 1904. Trans. Nat. Hist. Soc. Northumberland, 



Durham, and Newcastle, new series, vol. i., p. 220, 



pi. vi., figs. 1-9. 



One specimen only — a female — was found in washings of 



dredged material taken between St. Mary's Island and Souter 



Point (G. S. B.) N. 



