i6i 



General distributicn: Off Banda Island (Spenck Bate); Arabian Sea, off the 

 Travancore coast (Alcock); Easi London, Cape Colony (Stebbing). 



3. Heterocarpits tricarmatus Alcock & Anderson. PI. XIII and XIV, Fig. 38 — I'^d. 



Heterocarpus tricarinatus A. Alcock & A. R. S. Anderson, Journal Asiatic Soc. Bengal, Vol. 



LXIII, pt. 2, 1894, p. 154. 

 Heterocarpus tricarinatus A. Alcock, Descript. Catal. Indian Deep-Sea Crustacea, Calcutta 



1901, p. 10". 

 Heterocarpus tricarinatus Th. R. R. Stebbing, in: Annals South African Museum, Vol. XV, 



London 1914, p. 39. 

 Illustrations of the Zoology of the Investigator, Crustacea, Plate LI, Fig. i. 



Stat. 208. Sept. 22. 5°39'S., 122° 12' E. South of Muna Island. 1886 m. Bottom solid green 



mud. I adult male and 1 young female. 

 Stat. 211. Sept. 25. 5°4o'.7S., I20°45'.5 E. Entrance of the Gulf of Boni. 1158 m. Bottom 



coarse grey mud, superficial layer more liquid and brown, i young female. 



The adult male from Stat. 208 measures 119 mm. from tip of rostrum to end of telson, 

 the rostrum, 27 mm. long, is Yio shorter than the carapace, which proves to be 30 mm. long, 

 when measured from the orbital to the posterior margin; the abdomen, 62 mm. long, is but 

 little longer than carapace and rostrum taken together. The whole body, except the thoracic 

 legs and the pleopods, is covered with a close and fine tomentum. This specimen fully agrees 

 with the figure in the "Illustrations", except that the upper margin of the rostral teeth makes 

 a distinct angle with that part of the upper border which is situated between two teeth, while in 

 the figure that angle is not indicated. The upper margin of the rostrum is armed with 14 teeth, 

 the 6''^ of which stands above the orbital margin, the lower with i i . The abdominal terga, 

 even the third, are described by Professor Alcock as quite smooth and noncarinale, I wish, 

 however, to remark that the 3'''^ tergum (Fig. 38 «) shows on each side of the middle a shallow 

 depression, that fades away towards the anterior and the posterior margin, so that the tergum 

 looks at first sight as if it were very bluntly ridged, nearly as in Hetei'oc. gibbosus Bate; this 

 pseudo-ridge is, however, a little broader than in this species and less curved longitudinally; it 

 is continued on the 4''^ and 5''' somite, but no more visible on the 6"'. Sixth somite one-fifth 

 longer than fifth ; telson twice as long as 6'^ somite, nearly as long as the uropods, faintly 

 grooved longitudinally and armed with 4 pairs of dorso-lateral spinules, besides those at the tip. 



The antennular peduncle reaches to the distal third of the scaphocerite, 2"'' joint a little 

 longer than 3"^; stylocerite acuminate, reaching to the far end of 2"^' antennular article, with 

 the outer margin concave and with a small blunt process at its base, like in other species; 

 inner antennular flagellum about as long as the animal without the telson. Scaphocerite half as 

 long as the carapace, 3-times as long as broad (Fig. 38 <5), presenting its greatest width at the 

 proximal third and narrowing to the tip; terminal spine a little shorter than the distal tip of 

 the lamella. Antennal flacjellum one and a half as long as the entire length of the animal. 



The external maxillipeds project by half their terminal joint, which is one and a half as 

 long as the penultimate, beyond the antennal scale ; exopodite well-developed, reaching nearly 

 to the middle of the antepenultimate joint of the endopodite. 



SIBOGA-EXPEDITIE XXXI.\<;'. 21 



