460 E. RAY LANKISSTEB. 



The extra-orbital spines are larger than in C. Norm an i, and 

 the spines at the latero-frontal angles of the quadrate 

 carapace are emphasised. The eye peduncles seem to be 

 straighter and stronger than in C. Normani, and moi-e 

 broadly united to one another at the base. 



I am not able to speak with any certainty on the next 

 point, but if I may judge by Dr. Hansen's drawing the Ingolf's 

 Cymonomus is less generally beset with spinules, and these 

 are less prominent than is the case with C. Normani. In 

 this respect the *'Ingolf" form appears not to cai-ry on the 

 distinctive characters of C. Normani in an exaggerated 

 degree. But we shall no doubt receive fuller information on 

 the subject from Dr. Hansen. 



It is worth noting by the way that degrees of degeneration 

 of the eyes are known in the genus Cymopolus, M.-Edw., as 

 well as in the allied genus Cymonomus. 



Cymopolus Agassizii, M.-Ed\v., has the corneal surface 

 very greatly reduced, and there is an absence of pigment- 

 whilst in Cymopolus asper, M.-Edw., the corneal area of 

 moderate size is strongly pigmented with black. 



Apparently Cymonomus quadratus is the only member 

 of the Cyclodorippine crabs (or of any Brachyurous group 

 except Bathyplax) which has hitherto been described as 

 having the corneal area completely absent, and the ocular 

 peduncle persisting as a mere pointed rod. C. Normani is 

 now added to that list, as well as the forms dredged by the 

 "Valdivia" and the " Ingolf.'^ 



Note by Dr. A. M. Norman, F.R.S. 



The range of the described members of the genus Cymo- 

 nomus is as follows : 



1. Cymonomus Normani, E. Ray Lankester. 



"Porcupine," 1869. Lat. 59° 34' N., long. T 15' 

 W., 542 fathoms ; and lat. 59° 26', long. 8° 23', 

 705 fathoms. These dredgings are to the 

 north-west of the Butt of Lewis, and in the 



