MODIFICATION OF THE EVE PEDUNCLES IN CYMONOMUS. 447 



the pigment is feebly developed, tlie ommatidia few and in- 

 completely developed, and the eye-stalk short. Thns Cyclo- 

 dorippe completes the eye-series of Cymonoraus, and like the 

 less closely related Bathyplax cited at the end of Dr. 

 Ortman's list, justifies in large measure Lord Avebury's 

 supposition of a Cymonomus-form living in shallow water 

 and having well-developed eyes. 



Dr. Norman's very brief account of E thus a (Cy monomus) 

 granulata, which he intended to supplement by further 

 publication many years ago, has led to some misapprehen- 

 sions. In the first place it cannot be maintained, on consider- 

 ing the facts recorded as to depth at which the specimens 

 were taken, that the more modified form is correlated with 

 origin from deeper water. Normal specimens occur at 808 

 fathoms, and even at 1380 fathoms, whilst the peculiar forms 

 with rostriform eye-stalks occur at 542 fathoms. It seems 

 to be of greater significance that the locality in which the 

 latter were found is what Wyville Thomson and Carpenter 

 called '' the Holtenia ground." This fact may perhaps be 

 brought into relation with the discovery by the eminent 

 carcinologist Dr. Hansen of a similarly modified Cymonomus 

 among the Crustacea dredged by the ''Ingolf" around 

 Greenland and Iceland and north and Avest of the Faroe 

 Islands. Dr. Hansen has been good enough to communicate 

 this fact to uie, and a drawing^ of the single specimen 

 obtained. It was taken at a depth of 486 fathoms (bottom 

 temp. 5-5" C.) in lat. N. 62° 58', long. W. 23° 28'. 



I am, therefore, inclined to regard Dr. Norman's form with 

 rostriform eye-peduncles as having a geographical and not 

 merely a bathymetrical correlation. 



I may further remark that Dr. Norman's words as to the 

 modification of the eye-stalks in his deeper water form have 

 been misunderstood by subsequent writers. He says " they 

 terminate in a strongly rostrate point. No longer used as 

 eyes, they now assume the functions of a rostrum." This has 



1 See tcxt-fin;ure 12. 



