1887.] Gr. M. Giles — Six new AmpMpods from the Bay of Bengal. 215 



(i.) Phronima bucephala, n. sp., PL III, Figs. 1 & 2. 



Head large, and broad at tlie top, which is almost completely 

 occupied by the regularly arranged series of components of the apical 

 eyes. These latter, though essentially paired organs, very nearly blend 

 in the middle line, so that only a small space in that situation is 

 unoccupied by their visual cones. The dorsal aspect of the head forms 

 a large, transversely oval shield, which is separated from the anterior 

 and lateral surfaces by a distinct horizontal fold. The portion of 

 the head below this forms a truncated cone, tapering from the shield 

 like vertex to the mouth, which is placed on the truncate (ventral) 

 aspect ; the whole presenting a curious resemblance to the head of a 

 buffalo, which is further heightened by the circumstance that the 

 maxillipedes, lying along the posterior aspect of the truncated cone, 

 present an outline much like the large fleshy fold behind the lower jaw 

 of that animal. The lateral eyes are placed on the lateral aspect of the 

 head, immediately below the fold that separates the lower truncate 

 portion from the oval apical shield. Their component cones, like those 

 of the apical eyes, are regularly arranged, but are somewhat widel}^ 

 separated, so that there is no true faceting, although a close approach 

 to the true compound faceted eye is attained. 



The antennules are short and two-jointed ; the first joint about a 

 quarter the length of the second, which is of clavate form, and termi- 

 nated by a tuft of fine, short hairs : the entire length of the organ being 

 a full third less than that of the conical portion of the head. 



The antennae are obsolete. 



The gnathites are somewhat small and are articulated to the in- 

 ferior or ventral aspect of the truncated cone. Only enough was seen 

 of them to establish their being quite of the usual type, without any 

 salient peculiarities, and that the mandibles are unprovided with any 

 appendage. An unfortunate lurch of the ship spilled the portion of the 

 dissection containing them as they were being separated for the pur- 

 pose of drawing. 



The thorax^ as seen from above, forms with the cephalic shield a 

 pear-shaped body ; its five anterior dorsally visible segments being very 

 broad, the penultimate tapering rapidly, and the last being very long and 

 narrow. The first two are short and hard to distinguish from each 

 other. 



All the thoracic appendages, with the exception of the anterior 

 gnathopoda, are provided with branchial sacs, but the last two of these 

 greatly exceed the rest in size. 1st gnathopod about one-sixth the length 

 of the body. The dactylopodite very minute and claw-shaped, its 



