The Scottish Naturalist. 183 



the genus Thysanoessa of Brandt, which I have called Thysa- 

 noessa aberdonensis. The other two appear to belong to genera 

 hitherto undescribed. I have therefore constituted for their 

 reception the new genera Rhoda and Acanthocaris, placing in 

 the first, Rhoda Jar dineana, which species I have dedicated to 

 that eminent naturalist, Sir William Jardine, Bart. ; and in the 

 second, Acanthocaris Livingston cana, so named as a mark of 

 my esteem for Dr. Livingstone for his indomitable courage and 

 perseverance as an African traveller and discoverer. Specimens 

 of each of these species are in my own collection, and in those 

 of my friends, Messrs. Willis and Hodge, who have both 

 rendered me valuable assistance in this work. 



Let no one suppose that the work is completed. There is 

 yet much to be done, but we require workers. ' Let, therefore, 

 those who have spare time commence the study, and I will 

 guarantee them a rich harvest and much pleasure. 



In a complete list of British stalk-eyed Crustacea I would 

 place Acanthocaris immediately after the genus Phyl/osoma ; 

 but in the case of Rhoda I have been unable to determine 

 where it should appear. I have placed it provisionally after 

 Acanthocaris ; but regarding the position of both genera I am 

 somewhat in doubt, and will leave their proper place to be 

 determined by some one better qualified for the task. 



It will be seen that several individuals are enumerated in the 

 list whose specific names are not given. Although certain as to 

 the genera of these, I have been unable to refer them to their 

 proper species, as all have been discovered since the publica- 

 tion of Bell's " Stalk-eyed Crustacea," and their names and 

 descriptions published in several periodicals which I have had 

 no opportunity of consulting. 



Stenorhynchus phalangium Bell. — Common. 

 Stenorhynchus tenuirostris Bell. — Occasionally in cods' 



stomachs. 

 Inachus dorsettensis Leach. — Very common in cods' stom- 

 achs and in fishers' lines. 

 Inachus dorynchus Leach. — Occasionally on sands and in 



rock pools. 

 Hyas araneus Edw. — Very common. 

 Hyas coarctatus Leach. — Very common. 

 Cancer pagurus L. — Common. 



