A REVIEW OF THE MYSIDACEA 



131 



depths of 2,000 meters. It is a very deep-water form, the American 

 records being from 1,060 to 1,081 fathoms. 



Remarks. — The differences pointed out between A. ohlinii and A. 

 crozetii are admittedly small, but taken in conjunction with the geo- 

 graphical distribution they warrant the institution of a new species. 

 The form of the antennal scale (fig. 45, b) and its proportions are al- 

 most exactly the same in both species, as are also the shape and pro- 

 portions of the telson. The spine on the outer corner of the basal joint 



Figure 45. — Amblyops ohlinii, new species: a, Dorsal view of anterior end to show the ocular 

 plate; b, antennal scale and peduncle, X 20; c, telson, X 20. 



of the antennal scale is almost obsolete in A. ohlinii and there is a single 

 spine on the inner margin of the inner uropod near the statocyst. 



It is obvious that these specimens belong to the same species as those 

 recorded as A. crozetii by Ohlin (1901a, 1901b). The other papers 

 quoted in the synonymy are all references to Ohlin's record and are 

 not based on specimens actually examined. Zimmer's two papers 

 quote the description of the real A. crozetii from the Challenger re- 

 port and reproduce Sars' figures of that species, but the recorded dis- 

 tribution refers to Ohlin's paper. Hansen expressed the opinion that 

 Ohlin's specimens really belonged to a new species, but as he had no 



