Vol. 52.] 



FROM BRITISH COLUMBIA. 



223 



I. MACRURA. 



Tribe Ti4lassinidea. 

 Family Callianassidae. 

 Genus Calliakassa, Leach, 1814. 

 1. Callianassa Whiteavesii, sp. nov. (Figs. 1 & 2.) 



General integument of body extremely thin, or semimembranous, 

 except the first pair of feet, which are protected by a hard covering. 



Anterior feet (chelipeds) very unequal; length of larger limb 

 39 millim. ; breadth 9 millim. ; the dactylus is straight, and is 

 9 millim. long, but the fixed thumb of the propodos is rudimentary 

 and stout, being only half as long as the movable finger. Length 

 of smaller hand about 20 millim. Surface of hands faintly wrinkled. 



There are indications of the 

 segments of the abdomen and Fjg. \ n 



of the thin integument with 

 which they were covered, also 

 of the small thoracic legs, but 

 they are too much broken up 

 for detailed description. 



In this species from Van- 

 couver Island the fixed thumb 

 of the propodos is shorter than 

 in any of the species hitherto 

 recorded, and the movable 

 finger (dactylus) is straighter. 

 The species is smaller 

 than that from the Chalk of 

 Dulmen, Westphalia, or from 

 Maestricht, or Belfast. I 

 have designated it Callianassa 

 Whiteavesii, in honour of my 

 friend Mr. J. P. Whiteaves, 

 who has done so much for the 

 elucidation of the Cretaceous 

 formation in Canada. 



Original specimens preserved in concretionary nodules of Cre- 

 taceous age from Comox Ei Ver , Vancouver Island. Collected by 

 Dr. C. P. Newcombe (1892). Museum of the Geological Survey of 

 Canada, Ottawa. 



A nodule from Vancouver Island, in the Geological Society's 

 Museum, contains the re ma i ns of the large hands of Callianassa 

 Whiteavmi. A second n dule from the same collection contains the 

 carapace of Plagiolophus vancouverensis. 



Fig. 2. 



