ASIPHIPOU.V — STEB131.NG. 621 



It may be convenient to observe that the reference to M. 

 Bounier's remarks on this genus in the Bull. Sci. France-Belgique, 

 XX., which is given in " Das Tierreich " as p. 391, is in tlie separate 

 copy, p. 247. 



The discovery that the male sex in this genus has the second 

 gnathopods very decidedly larger than the first, although in the 

 female they are smaller, makes it desirable to transfer the genus 

 from the Aoridse, in which I placed it in 1906, to the Corophiidie. 

 In that family it may stand near to Say's Unciola, from which 

 It is clearly distinguished by the two free rami of the third 

 uropods. 



DRYOPOIDES WESTWOODI, Stebbinq. 



(Plate Ivii.A.) 



Stations 28, 35m, .57. 



Dryopoides westwoodi, Stebbing, Chall. Rep., Zool., xxix., 1888, 

 p. 1146, pi. cxxii. 



Dryopoides weshooodi, Stebbing, Das Tierreich, xxi., 1906, p.601. 



Except that the first antenna? are broken after the first joint 

 and the second after the third, a female specimen obtained by the 

 " Thetis " at Station 28 is in complete agreement with that figured 

 from the "Challenger" collection. It contained a few young 

 ones with their appendages well developed. As sometimes 

 happens in various species, it showed the gnathopods rather larger 

 on one side of the body than on the other. A female specimen 

 from Station 57 has the antennae in good condition, the upper 

 pair with twenty-four joints to the flagellum, the lower with six. 

 In a male from the same station there were twenty-two joints 

 to the flagellum of the upper antennae. 



In the other male specimens the antennae were defective. 

 In most characters they show so exact an agreement with the 

 females that there can be no reasonable doubt of their being 

 partners. The sexual variation, however, is rather remarkable. 

 It affects not only the first and second gnathopods, but also to 

 some extent the first and second peraeopods. 



The fir.st gnathopods of the male, besides being more bulky than 

 in the other sex, have the palm much more decidedly marked oft 

 from the hind margin and slightly sinuous. The second gnatho- 

 pods of the male, instead of being smaller than the first, are much 

 larger and have the oblong fifth joint notably longer than the 

 sixth. The palm of the sixth is straight, oblique, nearly as long 

 as the hind margin, overlapped by the moderately long finger. 

 In the specimen dissected the branchial vesicles were strikingly 

 small in comparison with the great size of the limb. The hand 



