275 



pair scarcely expanded distally, anterior and inferior edges forming together a 

 perfectly even curve; 3rd pair about twice as deep as the corresponding seg- 

 ment; 4th pair comparatively smaller and less broad than in M. lomi'niHOHi, 

 though considerably larger than the 2 preceding pairs combined, distal edge 

 very slightly curved, posterior extremity bluntly truncated. Last pair of 

 epimeral plates of metasome somewhat more produced at the lateral corners 

 than in the said species. Eyes rather small, rounded. Antennae nearly 

 as in M. loiujiniaua, but comparatively more slender. Anterior gnathopoda 

 with the meral joint less produced, propodos scarcely shorter than the 

 carpus. Posterior gnathopoda in female rather feeble, propodos elongated 

 and narrow, though gradually widening somewhat distally, palm rather 

 oblique and defined below by a small dentiform projection, in front of 

 which there are 2 rather elongated spinules, palmar edge slightly curved 

 and quite smooth, having only a double series of small hairs, dactylus slender 

 and elongated. Pereiopoda extremely slender, basal joint of penultimate pair 

 quite linear, that of last pair laminarly expanded in its upper part only; 

 meral joint in all pairs but very little produced. Last pair of uropoda less 

 strong than in M. longimana, basal joint considerably longer than the suc- 

 ceeding one, and armed with 2 small denticles. Telson very narrow, conside- 

 rably more than twice as long as it is broad, and armed with 2 pairs of 

 dorsal denticles, tip bluntly pointed. Colour in the living state of the animal 

 not yet stated. Length of adult female about 3 mm. 



Remarks. - As above stated, Boeck confounded this species with his 

 M. longimana. Dr. Hansen was the first to point out its distinctness, and has 

 given good detailed figures of both. Though nearly allied to M. loiuiintana, 

 it is, on closer inspection, easily distinguishable by the body being far less 

 robust in structure, by the somewhat different form of the gnathopoda, by the 

 slenderness of the pereiopoda, and especially by the peculiar form of the 

 basal joint of the last pair. According to Dr. Hansen, the male is far less 

 different from the female than is the case with M. longimana. 



Occurrence. - - I have never myself met with this form, but there is 

 a single badly-preserved specimen in our Museum, collected by Boeck at 

 Haugesund, west coast of Norway. Also the figures of this form given here 

 are from Greenlandic specimens. 



, Greenland (Hansen). 



