CRUSTACEA MALACOSTRACA. 



n 



at 34° 28' 25" N. L., 75°22'5o"W. L., 1632 fm.; later, a specimen was taken somewhat more to the north, 

 namely, 36°o5-5'N. L., of the same coast at 2512 fm. In 1905 a number of specimens were captured 

 by the "Thor" in the young-fish trawl at two stations respectively west of the Channel and west of 

 Brittany. The species is a bottom form certainly just as little as A. p^irpitrca. The length of the 

 wire out was in five catches respectively 1800, 900, 300, 300 and 200 m.; with 200 m. out only quite 

 small specimens were taken, while the two largest specimens were taken with 1800 and 900 m., and 

 with goo m. both large and rather small specimens were taken. 



Remarks. In his above mentioned paper Stanley Kemp refers A. gracilis Smith as a synonym 

 to A. dcbilis A. M.-Edw. Not having seen the French author's figure I have no opinion on the 

 question. My specimens agree well with the description and figure given by Smith, but not so well 

 with Kemp's description and figures of A. debilis. The lateral plates of the fifth abdominal segment 

 have their posterior margin less convex than in Kemp's fig. 4 and possess nearly always the 

 marginal tooth pointed out by Smith. Further, the telson has several dorsal pairs of spines in front of 

 the large pair, and the terminal part beyond the last pair of spines is considerably longer than shown 

 by Kemp. Finally, I cannot see any vestige of the luminous organs described by Kemp. For these 

 reasons I must leave the question of synonymy to future investigators. 



73. Acanthephyra Batei Faxon. 



PI. IV, fig. 2 a (named A. brevirostris). 



1888. Acanthephyra brevirostris Sp. Bate, Rep. Challenger, Vol. XXIV, p. 751, PI. CXXVI, figs. 5—6. 

 1897. — batei, Faxon, Mem. Mus. Comp. Zool., Vol. XVIII, p. 167. 



Occurrence. The "Ingolf has not found this species but it was brought home in 1904 by 

 the "Thor" from the following locality. 



South of Iceland: 6i°3o'N. L., i7°o8'W. L., young-fish trawl, 1800 m. wire out; i spec. 



Distribution. The species was founded on two specimens taken in the Atlantic at i°22'N.L., 

 26° 36' W. L., 1500 fm. No other specimens are mentioned in the literature. The species is certainly 

 not a bottom form; the specimen examined by me can scarcely have been in greater depths than 

 ca. 400 fm., so that it was living pelagically in the intermediate layers. 



Remarks. The "Thor" specimen is 60 mm. long. The carapace is greenish, lighter or darker 

 chiefly according to the colour of the tissues underneath. The dorsal aspect of the first three ab- 

 dominal segments is gray-green, the lateral surfaces much lighter. The carapace is furnished with a 

 high, sharp keel along the whole length of the median line; the front part of this keel and the 

 rostrum together with 10 dorsal spines, the rostrum which is somewhat bent upwards with i spine, at 

 the middle of the lower margin; the rostrum is more strongly bent upwards that Bate's fig. 5 shows. The 

 lateral keel of the carapace begins a little behind the orbital margin, continues right to the posterior 

 margin and is very obvious. The first and second abdominal segments have no dorsal keel, the four 

 following have a sharp dorsal ridge along their whole length and on the 4"' to the 6"" the ridge runs 

 out into a fairly small spine. The telson has 3 small spines on the sharp distal section of each of 

 the two ridges; the truncated end has 5 spines, of which the lateral pair are long, the three others 



