17 



spines (fig. 2 i) ; the terminal joint of the exopod is very oblong with setce along its margins. 

 The telson (figs. 2/, 2m and 211) is three and a half times as long as broad; each lateral 

 margin bears along its distal fourth 2 very long spines, 6 or 7 short spines, increasing gradually 

 in length backwards, between the two long ones, and four short spines along the distal half 

 of the distance between the base and the proximal very long spine. At the insertion of the 

 distal pair of long spines the telson is somewhat constricted; its terminal portion is an ovate 

 plate, the posterior margin of which is very convex and divided by five (in the half-grown 

 specimen by four) deep incisions into 6 (respectively 5) spiniform processes; from the bottom 

 of each incision projects a long, feathery seta. 



Length of a female with marsupium ca. 18 mm. 



Remarks. — The three specimens captured are very mutilated and badly preserved. 

 One of them is only half-grown ; in spite of the aberrant shape of the front end of the carapace 

 it belongs certainly to this species. The shape of the mouth-parts may be seen on the figures, 

 and a detailed description of labrum, mandibles, etc., is scarcely needed. 



Gnathophausia Will.-Suhm. 



The main sources to our knowledge of this large genus is G. O. Sars' "Challenger" 



Report and Ortmann's valuable paper: Schizopod Crustaceans in the U. S. Nat. Mus. — The 



Families Lophogastridae and Eucopiidse (Proc. U. S. Nat. Mus. Vol. XXXI, 1906). The "Siboga" 

 captured only 3 species, all known from the "Challenger". 



3. Gnathophatisia longispina G. O. Sars. 



1883. Gnatliopliausia longispina G. O. Sars, Forh. Vid. Selsk. Christiania for 1883, N'^ 7, p. 8. 

 1885. Gnathophausia longispina G. O. Sars, Challenger Rep. Vol. XIII, p. 46, PI. VII, figs. 



I— S, PI. VIII. 

 1906. Gnathophausia longispina Ortmann, Proc. U. St. Nat. Mus. Vol. XXXI, p. 41. 



Stat. 38. April i. Lat. 7°35'.4 S., long. ii7°28'.6E., 521 m. Trawl. 19 specimens, but the 



majority far from full-grown. 

 Stat. 314. February 17. Lat. 7°36'S., long. ii7°3o'.8E. 694 m. Trawl. 3 specimens. 



The largest male measures 68 mm. from the tip of the rostrum to the end of the telson; 

 the posterior lateral lappet of its second abdominal segment is nearly as long as the segment 

 itself. A female with the marsupium fully developed measures 64 mm. ; another female with 

 brood is a little smaller. These measurements are the largest hitherto recorded for both sexes 

 of this moderately small species. Otherwise I have nothing to add to Ortmann and Sars. 



4. Gnathophausia Zoca Will.-Suhm. 



1S75. Gnathophausia zoca Will.-Suhm, Trans. Linn. Soc. Lond. (Zool.) Ser. 2, Vol. I, p. 32; 



PI. IX, figs. 2—15, PI. X, fig. 4. 

 1885. Gnathophausia zoea G. O. Sars, Challenger Rep., p. 44, PI. VI, figs. 6 — 10. 

 1885. Gnathophausia ivillenioesii G. O. Sars, Challenger Rep. p. 38, PI. V, figs, i — 6. 

 1 89 1. Gnathophausia sarsi Wood-Mason, Ann. Mag. Nat. Hist. Ser. 6, Vol. VII, p. 187. 



SIBOGA-EXPEDITIE XXXVII. 3 



