146 BULLETIN OF THE 



considerable intervals. The front, also, has no median tooth, and the 

 hiatus of the orbit is widely open, not being filled by the basal-joint of the 

 external antenna?, which is narrow, and firmly soldered anteriorly to the 

 process of the front. The meros-joint of the external maxillipeds is as 

 broad as long, and does not project anteriorly, but fits accurately to the 

 anterior edge of the buccal area. The ambulatory feet are very slender ; 

 those of the first pair much shorter than those of the second ; second and 

 third pairs very long, the third longest ; fourth pair two thirds as long as 

 third. 



Bathynectes longispina nov. sp. 

 The following description is that of a male : Body naked ; feet also 

 naked, except the posterior ones, which are ciliated, as usual. Carapax 

 subhexagonal, with a granulated and uneven surface. A well-defined 

 ridge crosses the middle, connecting the lateral spines ; while a shorter 

 ridge crosses the cardiac, and another, interrupted at the middle, the 

 gastric region. Antero-lateral margin armed with five sharp, spiniform 

 teeth, including the angle of the orbit ; the posterior tooth or spine being 

 three times as long as the others, and more than one third as long as the 

 width of the carapax, excluding the spines; first (anterior) two teeth 

 broader and less spiniform than the others ; third and fourth teeth very 

 acute and a little longer than the distance between their bases. Front 

 prominent, four-toothed ; the middle two teeth being smaller than, and 

 projecting a little beyond, the two lateral ones. Orbit with two open 

 fissures above and one below; besides which, below, there is a sinus 

 beneath the outer angle, and a broader one, with a denticulated margin, 

 next the inner tooth. From the base of this inner tooth of the orbit 

 a small projecting lobe crosses the bottom of the hiatus of the orbit and 

 reaches the basal joint of the antenna. This joint is oblong in form, and 

 bears a crest or carina along the outer side, terminating anteriorly in 

 a slight tooth. Flagellum of the outer antennae more than half as long as 

 the carapax. Chelipeds one half longer than the carapax ; meros with a 

 long spine on the inner edge, and a short one on the superior edge, both 

 distant from the anterior extremity of the joint about one third its lenglh ; 

 carpus with a very long spine at the inner angle, which spine is itself 

 armed with two or three small teeth on the anterior edge, and with three 



illipcds. the meros-joint of which is elongated, projecting considerably beyond the 

 buccal margin; and the basal joint of the external antennas % slightly movable; 

 the carapax is naked; there is no elevated line on the surface of the terminal and 

 penult joints of the posterior pair of ambulatory feet, and the first joint of the abdo- 

 men is almost entirely concealed beneath the carapax. For P. holsatus and its allies 

 the name Liocarcinus is proposed. 



