Anamixis, Metopidae 



171 



curvcd process tipped with a ueedle-like spine, 6^*^ Joint slender, tapering, 



together with a iieedle-like finger opposed to tlie process of tlie 5*^ Joint 



to form a long delicate cliela. Gnatbopod 2 (Fig. 43), 2*^ Joint narrow, wider 



distally, 3'^ in appearance if not in reality 



articulating not only with 2*^ and 4*'S but also 



with the 5*'' and 6*^ joints, 5^^ subequal 



to 2'^ broadest at base, apically acute, not 



fully ]-eachiug the end of the broad 6^^ Joint, 



which is 3 or 4 tiraes as long as broad, the 



palm Short, oblique, tridentate, finger more 



than half as long as 6"^ Joint, strong, with 



curved acute tip much overlapping apex of 



5**^ Joint. Peraeopods 



3—5, 2<^ Joint ex- 



panded, oval. Pleo- 



pods with 5- or 6-join- 



ted rami, shorter than 



peduncle. Uropod 1 



longer than uropod 2 ; 

 in both the inner ramus is a little longer, the outer much shorter than 

 the peduncle; uropod 3 unknown. Telson a little longer than broad, apex 

 broadly rounded. L. about 3 mm. 



Tropical Atlantic (West Indies). From Goniastraea varia Dana. 



6"" Joint 



6"' Joint 



' Joint 



4'i> Joint 



' 3<i Joint 



Fig. 42. A. hanseni. 



Gnathopod 1. 



Fig. 43. A. hanseni. 



Gnatliopod 2. 



9. Farn. Metopiclae 



1899 Metopidae, T. Stebbing in: Ann. nat. Hist., ser. 7 vA p. 210. 



Side-plate 1 rudimentary, side-plates 2—4 together formiug large 

 lateral shield (Fig. 47). Antenna 1 sometiraes with rudimentary accessory 

 flagellum. Upper lip bilobed. Lower lip with inner lobes coalesced. Mandible, 

 cutting edge dentate, molar weak or wanting, palp small, 3-jointed, 3'^ Joint 

 very small. Maxilla 1, inner plate very small, outer with 6 spines, palp 

 1- or 2-jointed. Maxilla 2, inner plate the smaller. Maxillipeds (Fig. 44, 49), 

 inner plates coalesced or separate, outer small or wanting, palp elongate. 

 Gnathopod 1 (Fig. 45) simple or sometimes subchelate, generally feeble. 

 Gnatbopod 2 (Fig. 46, 50) generally robust, subchelate. Peraeopod 1 usually 

 more slender than peraeopod 2 (Fig. 48), 2*^ Joint little or not at all expanded 

 in peraeopod 3, usually much but sometimes not at all in peraeopods 4 and 5. 

 üropods 1 and 2 biramous, uropod 3 with a singie 2-jointed ramus. Telson 

 oval, entire. 



The adjustment of this family is involved in much difiiculty, because in regard 

 to many species it remains uncertain whether they have or have not an accessor}' 

 flagellum to antenna 1, whether the inner lobes of the lower lip aud the inner plates 

 of the maxillipeds be or be not coalesced, and whether the maxilla 1 have the palp 

 1- or 2-jointed. 



Marine. 



4 genera, 37 accepted species and 2 doubtful. 

 Synopsis of genera: 

 I Maxilla 1, palp 1-jointed 



1. Gen. Metopa 



Maxilla 1, palp 2-jointed — 2. 



, p. 172 



