MORPHOLOGICAL NOTES. 



27 



the perseon between the perseopoda, as in the immediately preceding 

 families of the Amphipoda curvicornia, but the anterior part of the folded 

 antennae, concealed under the head, is comparatively longer than in those 

 families. This feature is very interesting as showing the close relation 

 between the Oxycephalidas and the Lycoeidce. In the other genera the 

 first joint is only a little shorter than the second, and the second pair 

 of antennas are, when folded, concealed for their whole length under 

 the head within the above mentioned hollow channel, and within the 

 lower part of the spacious chamber, in which the first pair of antennae 

 are fixed. The length of the antennae in these latter genera depends naturally 



Fig. 28. Simorhynchotus Lilljtborgi. 



Fig. 29. Oxycephalus pectinatus 



upon the length of the head, so that they are comparatively short and 

 stout in the genera Glossocep halus and Stebbingella (fig. 30), tole- 

 rably long in Oxycephalus (fig, 29) and Streetsia, and very long and 

 slender in Dorycephalus (fig. 31) Leptocotis 1 ), and Xiphocepha- 



Fig. 30. Stebbingella typhoides. Facsi- 

 mile from Glaus Platysceliden, pi. 



Fig. 31. Dorycephalus Lindstroemi. 



lus (fig. 2). In the three genera, Simorhynchotus, Tullbergella, 

 and Cranocep halus the second joint is more than twice as long as 

 the first, while in all the other the second it is equal to or only a little 

 longer than the first. In all the genera the third and fourth joints are about 



1) The male of Calamorhynchus is hitherto not known. 



