76 CARL BOVALLIUS, THE OXYCEPHALIDS. 



l. Dorycephalus Lindstroemi, C. BOVALLIUS, 1887. 



The name is given in honour of Professor GUSTAF LINDSTROM of Stockholm. 



PL II, fig. 1618; PI. Ill, fig, 1; and p. 27, fig. 31; p. 29, fig. 39 

 and 44; p. 33, fig. 56; p. 38, fig. 73, and p. 39, fig. 77. 



Diagn. The head is about as long as the whole perseon and the first 

 pleonal segment together. 



The first pair of perceopoda are subcheliform; the under free 

 margin of the carpus is as long as the hind margin of the 

 metacarpus ; the lower part of the hind margin of the carpus 

 is provided with seven or eight teeth, some of them double- 

 pointed. The second pair are subcheliform, with the lower 

 hind corner of the carpus a little produced; the carpal pro- 

 cess is strongly serrated on the front margin, and provided 

 with three long sharp teeth on the hind margin just above 

 the apex; the front margin of the carpal process is quite as 

 long as the hind margin of the metacarpus. The femur of 

 the seventh pair is fully half as long as that of the sixth, 

 a little longer than broad, and twice as long as all the 

 following joints together. 



The lateral parts of the first two pleonal segments are angular 

 behind; the hind corner of the third segment is produced 

 into a triangular, sharp-pointed process, reaching beyond 

 the middle of the first ural segment. 



The inner ramus of the second pair of uropoda is only a 

 trifle longer than the outer; the inner ramus of the third 

 pair is twice as long as the peduncle, and more than twice 

 as long as the outer ramus. 



Syn. 1887. Leptocotis Lindstroemi, C. BOVALLJUS. 35, p. 38. 



If the above diagnosis be compared with that of Dorycephalus 

 ambobus, which follows, it at once will be seen that only small arid trifling 

 characteristics can be given for the distinction of the two species, and I 

 am much inclined to think that the latter ought to be considered as a 

 Pacific variety of the former. The closer discriptiori of D. Lindstroemi 

 will support the view that the two species are very nearly allied ; but as 

 I have myself examined specimens of D. ambobus, and as all the cha- 

 racteristics indicated by STEERING are exactly the same as in my speci- 



