1 1 



and Sic. benthophila were captured at depths respectively of 275 and 304 meter, Sic. dorsalis 

 was taken off Habana in water of 230 fathoms and, according to Miss Rathbun, Sic. longicaiida 

 occurs, off the Hawaiian Islands, between 295 and 351 fathoms, but also between 53 and 

 324 fathoms. 



f 50. Sicyonia benthopJiila de Man. 



J. G. DE Man, in: Notes fiom the Leyden Museum, Vol. XXIX, 1907, p. 143. 



Stat. 253. December 10. 5°48'.2S., 132° 13' E. Near Kei-islands. 304 m. Grey clay, hard and 

 crumbly. i female. 



A new remarkable, deep-sea species, related to Sic. picta Fax. from the west coast of 

 Central America. 



The carapace, rostrum inckided, measures about one-third the total length and is longer 

 in proportion to its height than in most other species: the carapace, indeed, 4,22 mm. 

 long without the rostrum, is 2,7 mm. high in the middle, appearing therefore on e and a 

 half as long as high. Carapace everywhere, though rather not thickly, covered with very 

 short setae, that are 0,04 mm. long. There is one small tooth in the median line of the carapace, 

 just in the middle, though the tip reaches a little in front of it ; behind this tooth the 

 carapace is rounded ; a second tooth is placed anteriorly, not far from the anterior margin of 

 the carapace, the distance between the latter and the tip of the tooth being Y^ the length of 

 the carapace. As in Sic. picta, the rostrum is short and high, reaching, just beyond the eyes, 

 to the far end of the i*' joint of the antennular peduncle; difterent, however, from this species, 

 the rostrum is quite horizontal, the straight upper margin being in a line with the upper 

 margin of the carapace. The upper margin bears 3 teeth, all on the rostrum itself, the i^' tooth 

 is a Httle farther distant from the anterior tooth on the carapace as from the 2"'^ rostral tooth, 

 that is half as far distant from the 3"^ as from the i"'. The lower margin, fringed with plumose 

 setae, is slightly arcuate and, curving upward, ends in a tooth, that reaches as far forward as 

 the 3'^'i tooth of the upper border; between these two teeth one observes an obtuse tubercle 

 on the truncate distal extremity of the rostrum and this tubercle that carries a few setae is 

 much shorter than the tooth at the end of the lower margin and than the tooth at the end 

 of the upper; a proper, acute tip of the rostrum does not exist. The rostrum is 0,54 mm. 

 broad in the middle, 0,56 mm. at its base and 0,3. mm. just behind the tubercle at the tip, 

 appearing here about half as wide as at the base; the lateral carina, that extends to the base 

 of the tooth at the end of the lower margin, is in the middle of the rostrum twice as far 

 distant from the upper than from the lower margin. 



Orbital angle subacute, the orbital portion of the anterior margin of the carapace making 

 a right angle with the antennal portion. Antero-inferior angle of the carapace rounded. Groove 

 defining the gastric region distinct, hepatic spine .slender, of moderate size ; branchiostegal 

 groove, below the hepatic spine, well-cut, slightly ascending backward and reaching to the level 

 of the posterior tooth in the median line of the carapace. 



The abdomen that is curved downward, is, as usually, carinate, but the carinae are 



SIBOGA-EXPEDITIE XXXIX (7. 



15 



