REPORT ON THE CRUSTACEA MACRURA. 637 



Habitat.— Station 194, September 29, 1874 ; lat. 4° 34' 0" S., long. 129° 57' 30" E.; 

 off Banda Island ; depth, 200 fathoms ; bottom, volcanic mud. One specimen, male, 

 associated with two female specimens of Heterocarpus dorsalis. Dredged. 



This species in many ways resembles Heterocarpus Isevis, A. Milne-Edwards, but 

 differs in several more or less important points from the figure given by him in the 

 drawings of the Crustacea of the Blake 1 Expedition. 



The carapace is dorsally compressed to a carina in the median line, which is armed 

 with four large teeth, of which the posterior stands over the cardiac region and the anterior 

 over the orbital, besides which there is a small tooth on the upper surface of the rostrum 

 a little in advance of the ophthalmopoda. The rest of the rostrum is smooth to the 

 extremity, the apex of which is broken off in our solitary specimen ; it is bent somewhat 

 abruptly and obliquely upwards. The lower surface is armed with six teeth, of which 

 the anterior is not far from the apex and small, while the rest are larger. The upper 

 lateral carina commences above and behind the tooth at the outer canthus of the orbit, 

 and continues to within a short distance of the posterior margin of the carapace, 

 where it abruptly turns towards the dorsal median line and is quite or nearly lost 

 in the surrounding tissue ; the lower or second lateral carina commences in a large and 

 well-developed tooth at the fronto-lateral angle of the carapace, and passes longitudinally 

 backwards to about three-fourths the length of the carapace, where it is lost in the 

 surrounding tissue. 



The anterior two somites of the pleon are dorsally rounded and smooth ; the third is 

 laterally compressed and dorsally elevated in the median line into an elongated tuberosity, 

 which is smooth on the surface and lost at the anterior and posterior margins of the 

 somite. The fourth somite is also laterally compressed and shows indications of a dorsal 

 longitudinal tuberosity ; the fifth somite is dorsally rounded and laterally compressed. 

 The sixth is laterally compressed and dorsally flattened ; the posterior margin is furnished 

 with a tooth on each side above the articulation of the posterior pair of pleopoda, and 

 projects directly backwards, forming a right angle on the upper side and a waved line on 

 the lower. 



The telson is dorsally flattened and anteriorly channelled ; the sides are depressed and 

 the angle formed by the depression is armed with four small spines ; the extremity is 

 formed by a small central rigid tooth with two movable spines on each side, of which the 

 outer is the longer, and has at its base on the outer side another small spine. The ophthal- 

 mopoda are short and pyriform, and the ophthalmi are globular and brown in colour. 



The first pair of antennae has the first joint of the peduncle deeply excavate to receive 

 the ophthalmopod, and is furnished on the outer margin with a long and slender 

 stylocerite that reaches anteriorly as far as the distal extremity of the third joint of the 



1 Recueil de Figures de Crustaees nouveaux on pen connus. — l ere Livraison (comprenant 44 planches). Avril, 1883. 



