MORPHOLOGICAL NOTES. 



33 



3. The cheliform hand, in which the carpus is not only dilated back- 

 wards, but also produced downwards into 

 a longer or shorter carpal process, so that 

 the metacarpus impinges against the front 

 margin of the carpal process and the dac- 

 tylus comes into no contact whatever with 

 the carpus itself. When the hind margin 

 of the metacarpus is in contact with the 

 front margin of the carpal process, the 

 metacarpus is at an angle of from 45 to 

 almost with the axis of the leg. 



Naturally there are many transitions 

 Fig. 54. The second pair of Oxyce- between the three kinds of prehensile 



phalus Clattsi. 



Fig. 55. The second pair of 

 Streetsia Steenstrupi. 



Fi(j. 56. The first pair of 

 Dorycephalus Lindstroemi. 



hands, but for practical reasons I think it best to keep these three 

 terms, at least as far as regards the tribe Amphipoda Hyperiidea. 



When the lower end of the metacarpus is dilated so that this 

 joint shows an under margin, straight or excavated, and when the hinder 

 corner of this under margin is produced so that the dactylus, or a por- 

 tion of the dactylus, impinges against the under margin of the meta- 

 carpus, I call the double prehensile organ thus formed: 



4. A complexely subcheliform hand, (fig. 56), or 



5. A complexely cheliform hand, (fig. 57) as the carpus is not or 



is produced, thus disregarding the fact whether the lo- 

 wer hinder corner of the metacarpus is or is not produced. 



Nova Acta Reg. Soc. Sc. Ups. Ser. III. 5 



