9 PERCY SLADEN TRUST EXPEDITION. 
eo 
os 
44, Amphithoé lobata, sp.n. (Plate 48. fig. 9.) 
II. Wasin, 7 fms. Two. 
Male. 
Body stout; pleon segment 3 irregularly rounded behind. 
Side plates about as deep as the segments: 1 produced in front to a blunted acute 
angle; 2 oblong, deeper than wide, angles rounded. 
Head nearly as long as the first 2 segments. Eye small, almost round, red. 
Ant. 1 (wanting in ¢) in 2 more than half as long as the body; 1st joint rather 
longer than the 2nd, which is 3 times as long as the 3rd; flagellum slender, 28-jointed, 
the joints lengthening distally. 
Ant. 2 shorter (in ?) than ant.1; 2nd joint rather longer than 3rd; flagellum 
longer than peduncle, many-jointed, setose. 
Mandibles have a 6-7-toothed tertiary cutting-edge, the teeth much larger than those 
of the primary and secondary, above the molar process; 2nd and 8rd joints of palp 
subequal, the terminal setze of the latter spinulose (fig. 9, M.). 
Maxilla 1; inner plate with one seta. 
Gnathopod 1. Second joint rather longer and narrower than the hand, distal end in 
front furnished with a crenate border and lobe, both spiniferous ; the lobe reaches almost 
to the end of the 8rd joint, which has a similar lobe without spines; the 4th joint is 
produced behind in a blunted setose point extending as far as the broader carpal process ; 
wrist shorter than the hand, process prominent, setose, front margin with 3 short 
spines; hand about twice as long as wide, palm oblique, shorter than hind margin, 
palmar angle rounded and succeeded by a shallow sinus. Dactylus as long as the palm, 
inner edge closely serrulate and spinulose (fig. 9, gv.' ¢ ). 
In the female (perhaps immature) the 4th joint is not produced behind, and the palm 
of the hand is evenly convex and defined only by a spine. 
Gnathopod 2 subequal to and resembling 1 both in ¢ and ?: in the ¢ the hand 
has more and longer set, especially on the front margin. 
Perzeopods 1 and 2: second joint more than twice as wide as 4th. 
Pereopod 8 stout; 2nd joint wider near the top than deep, front margin with 5 spines. 
Perzeopod 5: 2nd joint ovate, hind margin slightly serrate. 
All the perzeopods are very sparsely setose. 
Uropod 1: peduncle longer than rami, of which the outer is the longer. 
Uropod 2: rami subequal, extending a little beyond uropod 1. 
Uropod 8 as in A. rubricata (Mont.). 
Telson has 4 or 5 stiff upright setee in a row, the largest near the distal end. 
Length 7 mm. 
The chitinous lobes on the 2nd and 3rd joints of the gnathopods and the peculiar 
accessory cutting-edge of the mandibles characterize this species. 
