1909.] FROM THE BAY OF BISCAY. 857 



Channel Is. : Norman, as Sympleustes latipes (24. p. 366). 

 S.W. of Ireland : Bourne, as Amphiihopsis latipes (6. p. 317). 

 IST. America : off Grand Manan : Holmes, as Sympleustes latipes 



(19. p. 490) ; 45 fms. ; 1 specimen, 15 mm. 

 Bay of Biscay : Taken by the ' Caudan ' : Bonnier, as Parapleustes 

 latipes (4. p. 645) : 45° 57' N., 6° 21' W. ; in 1410 m. ; 

 bottom deposit "coraux et vase" ; 1 specimen, male, 10 mm. 

 Taken by the ' Huxley ', 26. viii. 06 ; 48" 7^' N., 8° 12^' W. ; 

 with the Agassiz trawl in 412 fms. ; bottom — sand, mud, 

 and hard ground ; 3 specimens, immature. 



Sympleustes grandimaxus Chevreux. (Plate LXXX. figs. 8-32.) 



Syn. 1887. Amphithopysis grandimana Chevreux, 5 , (9) pp. 570- 



580. 

 1893. Acanthozone latipes (part) Delia Yalle (13), p. 608. 

 1897. Parapleustes meyac/^erV "Walker, c5' , (42) p. 230, pi. 18. 



figs. 4-4 c. 



1 899. Sympleustes Stebbing (39), p. 209. 



1900. Dautzenberciia grandimana Chevreux (10), pp. 73-75, 



pi. x. fig. 1. 

 1906. Sympleustes megacheir Stebbing (40), p. 217. 

 Sympleustes grandimanus ,, ,, p. 318. 



Dautzenhergia grandimana ,, ,, p. 728. 



This species furnishes a remarkable example of the modification 

 of the " secondary sexual characters " after maturity is reached, 

 especially in the female (see figures 11 tfe 12.) It is interesting 

 also as an unusually pronounced type of sexual dimorphism. The 

 male and female, which have been described as separate species, 

 differ not only in both the gnathopods, but, what is more note- 

 worthy, in the shape of the first four side-plates. These in the 

 female are practically subequal, while in the male the 4th is 

 nearly twice as deep as the 1st. Other unusual points of differ- 

 ence will be found in the perseopods ; the 4th joint in the female 

 is shorter, in the male longer, than the 5th joint ; and the inner 

 margins of the fingers are dentate in the female, entire in the 

 male. 



Sympleustes grandimanus is distinguished from the other 

 known species of the genus by the comparatively small side-plates ; 

 the gi-eat inequality in size of the gnathopods ; the serrate fingers 

 of both gnathopods ; and the incised telson. 



In 1887 Chevreux described the female of this species under the 

 name of Amphithopsis grandimana, placing it near Amphiihopsis 

 pulchella Sars, among the Paramphithoidoi. In his later work, 

 however, he formed a new genus Dautzeiihergia, for its reception, 

 classing this genus provisionally in the family Calliopidje, pro- 

 A'isionally because of the great inequality in size between the first 

 and the second gnathopods. This same character and the differ- 

 ence in the form of the telson, are the reasons given for its 

 removal from the Paramphithoidce. 



Sars afterwards, in his ' Crustacea of Norway,' placed his species 

 A . pulchella in the genus Parajyleustes Buchholz (now Sympleitstes 



