131 



stitute Dana's subfamily Phronimin^. The fact'' that the two genera 

 come together again, and mingle their characters in Anchylonyx, rather 

 proves that the position which Dana assigned to them is the correct 

 one, and that the characters which he used for the subdivision of the 

 family are of more importance, than those adopted by Bate. 



ANCHYLONYX HAMATUS, n. sp. 



Head of moderate size, rounded above and pointed below, deeply con- 

 cave in front. The lateral lenses of the eye arranged in the form of a 

 rosette, and situated in a rounded projection on the lower portion of the 

 head, directly above the origin of the interior antennae. A number of 

 solitary lenses scattered over the lateral and dorsal surfaces of the head, 

 and connected by long and filamentous nerve-fibers with the inferior 

 eyes. The superior antennae nearly as long as the cephalolhorax ; first 

 joint of base short and broad; second extremely short, about one-third 

 the length of the first; third joint slightly longer than the head, lanceo- 

 late, inferior edge densely hairy, apex inferiorly produced; first and 

 second joints of the flagellum subequal, together about as long as the 

 third ; third and fourth subequal ; remainder of flagellum lost. Inferior 

 antennae more slender than the superior pair, very long ; flagellum very 

 much attenuated, filamentous, one-half, or more than one-half, the length 

 of the body; peduncle four-jointed — three of which are exposed beyond 

 the anterior margin of the head ; first joint short and broad ; second 

 longer than the rest, slightly oval ; fourth narrower, bent slightly up- 

 ward; joints of flagellum elongate — the first the longest; the remainder 

 subequal. The under surface of the flagella of both pairs furnished 

 with long, equidistant hairs. 



Segments of the thorax six ; the first and second soldered together ; 

 the five anterior subequal ; the sixth (the seventh normal) narrows poste- 

 riorly, and is nearly as long as the two preceding. First pair of guatho- 

 poda shorter and slenderer than the second ; meros of the same length as 

 the preceding joint, slightly produced inferiorly at the distal extremity — 

 theproduced portion finely serrated below and anteriorly, at the angle one 

 of the serrulations produced to a fine acicular spine ; carpus long, at in- 

 ferior apex a slender spine; propodos somewhat shorter than the carpus, 

 arched; dactylus about one-half the length of the propodos, arched, 

 acute, notched below the apex, with a wing-like plate on either side of base. 

 The carpal and moral joints of the second pair of gnathopoda neither 

 produced, nor spiniferous ; dactylus less than one-half the length of the 



