GAMMARIDEA. 923 



Plate 62, fig. 6 a, anterior part of body, enlarged ; b, part of the 

 flagellum of inferior antennae; c, extremity of leg of fourth pair; d, 

 leg of fifth pair ; e, extremity of same ; /, extremity of body. 



Sooloo Sea, with the preceding. 



Length three lines. The occurrence of the individuals of this spe- 

 cies with the preceding leads us to suspect that the two may be male 

 and female. Yet the great difference in the front is not like any 

 sexual difference hitherto noticed; moreover, the superior antennas 

 differ much. 



Subfamily LEUCOTHOINiE. 



Genus STENOTHOE, Dana. 



Epimerce permagnce, Atce maximce, 60s parvidis. Mandibular non palpi- 

 gerce nee processa molari instructor, apicali acie denticulatd et altera 

 accessorial. Maxillipedes angusti, oblongi, lamellis internis obsolescen- 

 tibus. Pedes 4 antici manibus confecti, 2dis pervalidis. [Antennae 

 superiores paulo longiores.~\ Pedes 10 postici longitudine rnediocres. 

 Styli caudales Imi 2dique biramei, ramis bene subulatis, 3tii simpli- 

 cissimi, subidati. 



Epimerals very large, the fourth largest, fifth small. Mandibles with- ' 

 out palpi, or molar prominence, having a denticulate edge at sum- 

 mit, and another inside just below summit. Maxillipeds narrow, 

 oblong, the inner lamellar processes obsolescent. Feet of four ante- 

 rior pairs ending in hands, those of second pair very stout. [Supe- 

 rior antennae a little the longer.] Feet of ten posterior pairs of mode- 

 rate size. Caudal stylets of first and second pairs with two subulate 

 branches ; of third pair simple and subulate. 



The slender maxillipeds without the inner lamellar processes and 

 the non-palpigerous mandibles, are alone sufficient to mark this genus 

 as distinct from others to which it is related. The third and fourth 

 epimerals are peculiarly large, and the following three quite small. 

 The terminal edge of the mandible is denticulated; just below it on 

 the inner surface there is a second prominent, thin edge, or process, as 



