INVERTEBKATE FAUNA OF LABRADOR. 299 



sertion of the superior antenna ; not colored in the adult, but black in the young. Supe- 

 rior antenna a little longer than the peduncle of the inferior pair ; inferior antenna, reach- 

 ino- to the hind edcre of the fourth thoracic, including the cephalic, ring ; the penultimate 

 and last joint of the peduncle equal in length ; flagellum about half the length of the whole 

 antenna Both pairs of gnathopoda very equal in size, the propodos being long ovate ; ante- 

 rior pair slenderer than in M. carinatus, palm very oblique, with minute hairs ; dactylos two 

 thirds the length of the propodos ; carpus minute, not prominently produced as in M. cari- 

 natus, but rather continuous with the propodos. The second pair are much stouter and 

 more ovate than in M. carinatus, according in this respect more with that of M dtmmus 

 Stimps In form it closely repeats that of the anterior pan ; carpus with a long, slender, 

 spine like prolongation from the palm, forming a thumb closely appressed to the propodos 

 but not extending to the middle. Palm of the propodos on the anterior half fringed with 

 hairs Dactylos one half as long as the propodos. Anterior pair of thoracic legs subequal ; 

 posterior pair of thoracic legs twice as long and much larger than the anterior coxae regu- 

 larly short, pyriform. Abdominal legs large, equal in size, reaching nearly to the tip of the 

 caudal stylets, which are lanceolate, very slender, acute ; the first pair being a very little 

 longer than the third. Color pale, mottled with slate. Length, .50 inch. 



it differs from M. demissus of Grand Menan, in its color, and the very unequal antennae 

 From M carinatus of the British Isles it may be readily distinguished by the very equal 

 gnathopoda and non-carinated segments, the slenderer antennae, and the smaller, round eyes. 



Caribou Island, eight fathoms, sand. At Henley Harbor a female, with several young 

 attached to the under side, was dredged in four fathoms, the last of June. 



Ampelisca Gaimardi {fide Beck.) [Pi VIII., fig. 1, 1 a.] 



A slender thin, much compressed, dorsally wedge-shaped species ; head scarcely as much 

 produced as'in A. inaens Stimps. Eyes four, distinct, small, round and black, situated very near 

 the front margin ; rostrum short, rather obtuse. Antenna, remarkably ong and slender ; 

 s merior pair a little more than half the length of the body ; basal joint of the peduncle very 

 thick globose, while the two succeeding joints are very slender; the third joint being very 

 short' C The peduncle of the inferior antenna is two thirds as long as the whole superior 

 antenna bein- very long and slender, with the basal joint large, cylindrical the last joint 

 be ng nearly I long as°the penultimate; flagellum long and slender, with long feathery 

 hairs° Firs! pair of gnathopoda small, propodos broad, produced mfenorly j carpus larger 

 than 'in .1 inaens; second pair much shorter and stouter than in A. %m ; carpus but one 

 fourth Ion Jv than the propodos, which is larger and broader than m Amgens, ovate ; dac- 

 tylos Ion And slender, reaching beyond the middle of the propodos ; inferior margin of the 

 oint with fasciculi of long uneven hairs. Legs much as in A. wgens, hinder pair of legs 

 'shorter and stouter, bases with the expansion reaching to the last joint of the leg, when m 

 A nan * is short not reaching beyond the fourth joint from the end ; its outer edge is 

 tS within, fa 1 and rounded, convex, edged with thick set hairs ; joints of the legs 

 w^bn'o- feathery hairs. Pleopoda well developed, of nearly even length. Abdomen 

 S^Inuat 7ving a slightly 1 tuberculate outline to the dorsum. Telson long, narrow, 



"TM^fulTrm Z^A** *om A. ** apparently its nearest ally, by 

 its r maS v ong and slender antennae, with the globular basal joint of the peduncle of the 

 superior Pair; by its compressed cuneate body, the long, broad basos of the hindermost 



UEMOIES BOST. SOC. NAT. HIST. Vol. I. Ft. 2. 



