MORPHOLOGICAL NOTES. 



39 



vidnal abnormity in the only specimen examined owing to .some lesion, 

 or if not, I am quite unable to see how such a contradiction is to be 

 explained. In Xiphocephalus the telson is usually much longer than 

 the rest of the urus. 



The uropoda show naturally the same gradation as the urus 

 from stout, broad, laminar peduncles with broadly lanceolate rami, to 

 extremely elongated, rod-like peduncles with more or less needle-shaped 

 rami. In Gloss oc ephalus (fig. 71) they are very broad and short 



Fig. 75. Oxycephalus piscator. 



Fig. 76. Simorhynchotus Lilljeboryi. 



like those in the genus Hyperia; in Simorhynchotus (fig. 76), Oxy- 

 cephalus, C ranocephalus, Tullbergella and Stebbingella, they 

 are comparatively short; in Dorycephalus (fig. 73), Leptocotis and 

 C alamorhy nchus they grow gradationally longer and narrower, the 

 peduncle of the first pair even in Leptocotis being 8 or 10 times 

 longer than broad. In Xiphocephalus the elonga- 

 tion is carried to its extreme limit, the length of the 

 rod-like peduncles being 30 50 times greater than 

 their breadth. 



In some of the genera, see the diagram p. 46 

 all the rami are free, articulating with the pedunc- Fig. 77. Dorycepha- 

 les (fig. 71 and 72), in others viz: Dorycephalus ^ ^dstroemi. 

 and Tullbergella (fig. 73 and 74) the inner ramus of the last pair is 

 coalesced with the peduncle while ail the other rami are free; and 

 lastly in Oxycephalus (fig. 75 and 76) and others the inner rami of 

 the last two pairs are coalesced with the corresponding peduncles, the 

 other rami being free; and in Xiphocephalus also the inner rami of 

 the last two pairs are coalesced with the corresponding peduncles (fig. 

 7880). 



