49 



Stat. 291. January 20, 1900. g° IC/.3 S., I25°55'.i E. Timor Sea. 421 m. Bottom vcry fine, grey 



mud. 1 young female. 

 Stat. 316. February 19, 1900. 7°I9'.4S., n6°49'.5E. Bali Sea. 538 m. Bottom fine, dark 



brown sandy mud. 1 young male. 



The largest specimen, the female with eggs from Stat. 46*, measures 66 mm. from tip 

 of rostrum to tip of telson, the carapace being 28 mm. long, the rostrum included, and 15 mm. 

 without it. It fully agrees with Figure 1 of the "Challenger Macrura", but the rostrum is 

 distinctly somewhat (3 mm.) shorter than the scaphocerites. The upper margin is 6-dentate, the 

 i st tooth, situated just midway between the orbital margin and the distal end of i st antennular 

 article, is microscopical, only visible by means of a strong magnifying glass, while the foremost 

 tooth is placed midway between the 2 na and the apex of the rostrum; the lower border is 

 armed along the middle third with 5 teeth, of which the i st and the 5 th are much smaller than 

 the rest, that are equal. In the other female from this Station the rostrum appears just as long 

 as in Bate's figure 1 and is f-dentate. In the young female from Stat. 211 which is 43 mm. 

 long, the rostrum just reaches beyond the scaphocerites and is V'-dentate ; the two first teeth 

 of the upper border are microscopical and the foremost tooth stands at one-sixth the length of 

 the rostrum from the tip. Of the female long about 49 mm. from Stat. 291 the rostrum is as 

 long as in the female from Stat. 211 and also armed with 10 teeth above, but the three first 

 and the foremost one are microscopical; the lower margin, however, bears only 5 teeth. The 

 rostrum of the male from Stat. 1 7 is broken off, this specimen, however, measured probably 

 about 50 mm.; the other male from the Bali Sea has nearly the same size, the rostrum, as 

 long as in Bate's figure 1, is f-dentate, but all the teeth of the upper border are well-developed. 

 The length of the rostrum proves thus to be somewhat variable. 



In the largest female from Stat. 46 a the dorsal median carina appears rather sharp 

 along the whole length of the gastric region, but in the other younger specimens it becomes 

 gradually obtuse posteriorly near the cardiac region ; a little posterior to the orbital margin the 

 dorsal carina bears a small circular impressed point and appears here a little higher. On the 

 cardiac region the carina is rather obtuse, somewhat widened in the middle and in the largest 

 specimen, the ova-bearing female from Stat. 46% even flattened. On either side this widened 

 part of the carina carries 2 or 3 small tubercles and a few small tubercles exist also, on either 

 side of the carina, on the dorsal surface of the cardiac region, which is separated from the 

 gastric region by a shallow transverse groove. The spine at the postero-lateral angle of the 

 carapace is not straight, as figured by Bate, but slightly curved, directed backwards and 

 outwards; it appears also comparatively a little shorter than in Figure 1 of the „Chal- 

 lenger Macrura". 



Hoplophorus typus is pretty well characterized by the form and the relative length of 

 the three dorsal spines of the abdomen, that are accurately figured in Bate's figure 1. The 

 spine of the 3 rd tergum is constantly longer than that of the 5 lh , rather little longer in adult, 

 but much longer in younger individuals, also less slender, somewhat thicker or higher at the 

 base; the spine of the 4 th tergum is always distinctly shorter than the two others and 

 more or less regularly curved. The two first somites and the triangular anterior part of the 



SIBOGA-EXPEDIT1E XXXIX ,!■'. 7 



