450 E. RAY LANKESTEK. 



tion of tlie plate, and tliono-h obvious to the carciiiologist lias 

 led to some misunderstanding. Thus in the excellent volume 

 ' La vie au fond des Mers/ by the late Professor Filhol, a 

 woodcut of this mutilated specimen is given as representing 

 the species concerning the eye-stalks of which Dr. Norman's 

 observations are quoted in full, altliough the figure shows 

 no eye-stalks at all ! 



The drawing made by Mr. Albany Hancock in 1875, and 

 now published as fig. 2 in PI. 33 of the present memoir, 

 really represents accurately the normal C. granulatus of 

 Norman as it actually appears ; and it will be seen, if this 

 drawing be compared with those given in the earlier publica- 

 tions, that there are important deficiencies in the latter. 

 Having carefully compared the type specimens of Norman 

 now in the British Museum (Natural History) with Mr. 

 Hancock's drawings, I have satisfied myself that they could 

 not be improved upon, and have therefore reproduced them 

 untouched. Those who have already learnt to know the 

 accuracy and artistic ability of that admirable naturalist will 

 not be surprised that this course has been followed. 



With regard to the other species of Cymonomus, the C. 

 quadratus for which Milne-Edwards established the genus, 

 no figure was published until the year 1902, when in the 

 'Memoirs of the Museum of Comparative Zoology at Harvard 

 College,' vol. xxvii, No. 1, MM. Milne- Edwards and Bouvier pub- 

 lished their account of the crabs of the families Dromia.cea and 

 Oxystoma, dredged by theU.S. Coast Survey steamer "Blake." 



The genus Cymonomus is there described by MM. Milne- 

 Edwards and Bouvier as forming with the genera Palicus, 

 Ethusa, Cymopolus, Corycodus, Clythroccrus, and Cyclodo- 

 rippe, the family Dorippidae, M.-Edw. 



Two species of Cymonomus are described, viz. C. quadra- 

 tus, M.-Edw., the type species, and C. granulatus, 

 Norman. A plate (pi. xvi) is given to the illustration of C. 

 quadratus, which, although described at an earlier date by 

 Milne-Edwards, was not figured when that author published 

 his figure of C. granulatus in the '^ Travailleur " volume. 



