69 



paratively shorter than in the preceding specimens, much shorter than the outer 

 uropod, even a little shorter than the inner, but projecting beyond the latter by the large 

 spines at the tip ; lateral margins of the telson only with 3 spinules besides those at the tip. 



According to Bate's description of Acanth. tenuipes (Report Challenger Macrura, 1888, 

 p. 836) the rostrum should be armed "with four or five distantly placed minute denticles", but 

 on the fio-ure 2 of Plate CXXXVI nine denticles are visible. The 2 Dd abdominal tergaim should. 

 after the same author, be smooth, while in our specimens it is distinctly carinate. I therefore 

 hesitate to refer them to Bate's species and I may, finally, allude to the fact that the two 

 specimens from Stat. 230 show some slight differences from that which was collected at Stat. 243, 

 as has been described in the preceding lines. 



7. Acanthephyra (Meningodora) Sibogae de Man. PI. VII, Fig. 17 — 17/. 



Acanthephyra (Meningodora) Sibogae J. G. de Man, Zoologische Mededeelingen, uitgegeven 

 vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. Deel II, Afl. 3 en 4, 1916, p. 149. 



Stat. 2io a . September 24. 5° 26' S., I2I°i8'E. Entrance of Gulf of Boni. 1944 m. Bottom 

 grey mud, upper layer more liquid and brown; pumice stone. 2 specimens, 

 probably female. 



A new remarkable species related to Acanth. brevirostris Smith = Hymenodora duplex 

 Bate, to Acanth. rostrata (Bate) and to Acanth. Batci Faxon = Acanth. brevirostris Bate. 

 It agrees with the two first in the possession of a soft and m e m bra naceou s integument, 

 owing to which both specimens are in a rather damaged condition, and of a short rostrum, 

 while it resembles Acanth. Batei Faxon also by the shortness of the rostrum and by the 

 abdomen, of which only the carinae of the 4 th , 5 th and ó th somite are produced posteriorly to 

 a small tooth. The two specimens are nearly of equal size, about 59 respectively 64 mm. long 

 from tip of rostrum to tip of telson : owing to the bad condition the length of the abdomen 

 could not be measured accurately, the abdomen, however, appears to be twice or little more 

 than twice as long as the carapace, rostrum included. Carapace dorsally carinate along its whole 

 length, the carina extending from the apex of the rostrum to or almost to the posterior margin ; 

 the carina is sharp and shows, a little before the middle, a depression, that corresponds with 

 the cervical groove. The rostrum, that bears much resemblance to that of Hymenodora mollis, 

 as figured by Spence Bate (Challenger Macrura, PI. CXXVI, Fig. 5), is in the smaller specimen, 

 in which it is complete, about one-fifth the length of the rest of the carapace, vvhen 

 measured horizontally, as indicated by Stanley Kemp (in: "Fisheries, Ireland, Sci. Invest. 1905, 

 I., [1906], p. 9, Fig. 1") and appears j 11 s t as high, at the level of the orbital margin, as 

 long. About midway between the cervical groove and the level of the orbital margin the 

 dorsal carina of the carapace curves at first downward to near the corneae of the eyestalks, 

 when stretched straight forwards, and runs then horizontally or slightly ascending forward to 

 the tip. The upper edge, i. e. the described descending part of the rostral carina, is armed with 

 6 small, immovable teeth, of which the 4 th is placed immediately in front of the orbital margin, 

 so that three teeth are placed before and three behind that margin ; the distance between the 

 3 ,d and the 4 lh tooth is a little larger than the distances between the other teeth, the distances 



