543 



comparatively small accessory appendage of the superior antennae, which is 

 only composed of 2 articulations (Sp. Bate describes it as uniarticulate), and 

 also by the somewhat different shape of the anterior gnathopoda in the male. 



Occurrence. The species would seem to have a similar distribution 

 along the coasts of Norway as the preceding form; but 1 have, in every 

 instance, found it only in very shallow water, and especially on a bottom 

 composed of fine muddy sand, partly overgrown with grass. 



Distribution. - British Isles (Sp. Bate). 



3. Microdeutopus gryllotalpa, Costa. 



(PI. 192, fig. 2). 



Microdeutopus gryllotalpa, Costa, Rend, della Reale Acad. delle Sc. di Napoli, p. 178. 



Syn : Autonoe grandimana, Bruzelius. 



Body comparatively somewhat less slender than in the 2 preceding- 

 species, but otherwise of a very similar appearance. Cephalon about the 

 length of the first 2 segments of mesosome combined, lateral corners deflexed 

 and narrowly rounded at the tip. Coxal plates scarcely as deep as the 

 corresponding segments, 1st pair in male somewhat more produced anteriorly 

 than in female, though not nearly to such a degree as in the 2 preceding 

 species. Epimeral plates of metasome about as in M. danmoniensis. Eyes 

 small, rounded, pigment dark. Superior antennae considerably exceeding half 

 the length of the body, peduncle of the usual structure, nagellum half as 

 long again as the peduncle, and composed of about 20 articulations, accessory 

 appendage extremely small and uniarticulate. Gnathopoda in female nearly 

 as in M. danmoniensis. Anterior gnathopoda in male enormously developed, 

 with the carpus extremely large and massive, broadly oval in form, and 

 forming below 3 strong dentiform projections, the outmost of which is tin- 

 largest, propodos scarcely more than half as long as the carpus, and much 

 narrower, with the lower edge irregularly sinuated, forming 2 rounded pro- 

 jections, the outer of which is the broader and slightly bilobed, dactylns strong 

 and dentated inside. Posterior gnathopoda in male considerably larger than 

 in female, with the basal joint much expanded, subfusiform in outline, and 

 having the anterior edge crenulated, propodos about the length of the carpus 

 and very narrow, sublinear. Pereiopoda and uropoda about as in H. dan- 

 moniensis. Telson of the usual structure. Body densely variegated with a 

 dark brownish pigment. Length of adult male 6 mm. 



