3 2 



LIST OF THE SPECIES OF THE GENUS STYLODACTYLUS A. M.-Edw., 



KNOWN AT PRESENT. 



SPECIES 



HABITAT 



DEPTH IN FATHOMS 



Amarynthis de Man 1902 . . 



bimaxillaris Bate 1888 . . . . 



discissipes Bate 1888 



orientalis Bate 1888 



rectirostris A. M.-Edw. 1883 

 serratus A. M.-Edw. 1881 . . 



Sibogae de Man 19 18 



Ternate 



Between the islands of Wowoni and Buton 



Bay of Pidjot, Lombok 



Near 7°o'S., i20°34'.5 E. 



Off the Admiralty Islands 



Sagami Bay, Japan 



North of the Kermadec Islands 



Hawaiian Islands 



North of the Kermadec Islands 



St. Lucia 



Off St. Domingo 



Off Martinique 



Off Nevis, Antilies 



East London, Cape Colony 



Sulu Sea 



41 — 51 



5—12 



164 — 218 



150 



82 



600 

 230 to 53 



600 



116 



524 



334 

 356 

 300 

 285 



1. Stylodactylus Amarynthis de Man. PI. V, Fig. 9 — 9//. 



Stylodactylus sp. {amaryntliis) J. G. de Man, in: Abh. d. Senckenb. naturf. Gesellschaft, 

 Bd. XXV, 1902, p. 897, Taf. XXVII, fig. 64. 



Stat. 33. March 24/26. Bay of Pidjot, Lombok. 9 — 22 m. Bottom mud, coral and coralsand. 



1 young specimen. 

 Stat. 65a. May 6. Very near Stat. 65 (7°o'S., 120 34'. 5 E.). 300 — 400 m. Bottom pale, grey 



mud, changing during haul into coral bottom. 1 very young specimen. 

 Stat. 204. Sept. 20. 4°2o'S., 122° 58' E. Between the islands of Wowoni and Buton, northern 



entrance of Buton-strait. Depth from 75 — 94 m. Bottom sand with dead shells. 



One egg-bearing female. 



Stylodactylus Amarynthis was founded in 1902 on an evidently young specimen from 

 Ternate, the egg-bearing female from Stat. 204, however, must no doubt be referred to the same 

 species, because the differences from the original description, chiefiy as regards the characters 

 of the rostrum, are certainly owing to this female being adult and full-grown. 



The female from the northern entrance of Buton-strait is 20,2 mm. long from the 

 extremity of the rostrum to tip of telson, just one and a half as long as the specimen from 

 Ternate. The rostrum, 5,7 mm. long, measured from the orbital margin, is just twice as 

 long as the rest (2,8 mm.) of the carapace, when measured dorsally ; it is sloping downward 

 for about two-thirds its length, while the distal third slightly ascends upward, though the 

 acuminate apex does not extend to the level of the upper border of the carapace. The height of 

 the rostrum along the basal half is */„ o( its length, but nearly from the middle it gradually 

 narrows to the extremity. The upper margin (Fig. 9^) is armed with 14 spines, the lower with 5; 

 the three anterior spines of the lower margin are slightly larger than the two preceding and than 



