68 



6. Acanthephyra sp. PI. VI, Fig. 16. 



Stat. 230. Nov. 14. 3°58'S., i28°2o'E. South-east of Ambon. From a depth of 2000 m. to 



surface. 2 specimens. 

 Stat 243. Dec. 2. 4°3o'.2S., I29°25'E. From a depth of 1000 m. to surface. 1 specimen. 



I not succeed in determining with certainty these specimens, that probably are the young 

 stage of a known species. They belong to that section of the genus in which the rostrum is 

 unarmed below, in which -the dorsal tooth of the 3 rd abdominal tergum does not reach to the 

 middle of the 4 th and in which the rostrum is deep at base, so that they bear a close resemblance 

 to Acanth. fenidpes (Bate), one specimen of which was trawled by the Challenger Expedition 

 off the East coast of Cape York Peninsula. 



The two specimens from Stat. 230 are of the same size, about 18 mm. long. In one 

 of them the rostrum reaches the far end of i st antennular article and is armed above with 7 

 teeth ; these teeth are rather large, contiguous, the 3" 1 is placed above the orbital margin ; a 

 line uniting their apices appears slightly arched and a little more than twice as long as the 

 distance between the foremost tooth and the tip. The rostrum of the other specimen has the 

 same form and length, but there are only 5 teeth on the upper margin, one of which stands 

 on the carapace. The rostral carina arises at the anterior third of the carapace. Antennal spine 

 small, buttressed by a short carina, that does not reach the hepatic groove. First abdominal 

 tergum smooth, 2 nd to 6 lh carinate; carina of 3 rd tergum somewhat more curved than in Bate's 

 figure 2 of Plate CXXXVI, the posterior spine as long as in that figure. The dorsal carina of 

 the 4 th tergum bears a small incision just in front of the posterior spine, which is much smaller 

 than that of the 3 ld tergum, but as large as that of the 5 th , while the posterior spine of the 

 6 th is the smallest of all. 



Measurements in m i 1 1 



Rostrum 



Length of 5* tergum .... 

 Length of 6 t!l tergum .... 

 Width of 6'h tergum anteriorly . 

 Length of telson 



3-12 



Telson a little shorter than the outer uropod, but projecting by the large terminal spines 

 beyond it ; the lateral margins are armed in the first specimen with 8 or 9 spinules, besides 

 those at the tip, in the other they could not be numbered with certainty. 



The specimen from Stat. 243 measures 19 or 20 mm. The rostrum has the same form 

 as in the two preceding, but bears 6 teeth, the 3 rd of which stands above the orbital margin; 

 the 6 th or distal tooth is half as far distant from the tip of the rostrum as from the i st . In 

 this specimen the anterior half of the carapace is sharply carinate dorsally, while in the two 

 preceding specimens the rostral carina arises at the anterior third ; the carina of the antennal 

 spine is also longer and reaches to the hepatic groove. The abdomen agrees with 

 that of the specimens from Stat. 230. Second tergum carinate, like the following. Fifth tergum 

 1,2 mm. long, 6 th 3,4 mm. long and 1,2 mm. wide anteriorly; telson 2,9 mm. long, com- 



