154 S. T. Smith on American Crustacea. 



The aspect of the single species upon which this genus is founded 

 is quite peculiar. The body is thick, the dorsal surface is uneven and 

 the lateral margin is armed with five teeth (including the angle of the 

 orbit), the last and smallest of which is on the postero-lateral margin. 

 The form of the carapax, the arching of the front above the antennu- 

 Ise, and the number of teeth on the lateral margin, recall the genus 

 Cryptogropsus^ from which, however, it is widely separated by the 

 form of the external maxillipeds and of the epistome. In the form 

 of the maxillipeds it is allied to Ileterograpsus. The form of the 

 epistome and the peculiar, deep efferent orifice are very marked and 

 distinctive characters. 



Glyptograpsus impressus, sp. nov. 



Male. The dorsal surface of the carapax is uneven, with numerous, 

 irregular, shallow punctures, and along the lateral borders, with small, 

 tuberculose elevations. The cervical suture is indicated by a very dis- 

 tinct sulcus. The median portion of the gastric region is separated 

 from the protogastric lobes by deep sulci, which unite between these 

 lobes and extend down the front as a broad and deep depression. 

 The epigastric lobes are very prominent and their anterior margins 

 are transverse and precipitous. The protogastric lobes are well indi- 

 cated, and an outer lobule is separated as a small, but very distinct, 

 tuberculiform elevation opposite the inner angle of the orbit. The 

 epibranchial lobes are uneven and partly separated from the meso- 

 branchial by well marked, but short, depressions. The posterior por- 

 tion of the branchial region is divided by a longitudinal ridge into a 

 flat inner area and a broad precipitous portion between the ridge and 

 the lateral margin. The front, as seen from before, is very sinuous, 

 and broken in the middle by a broad, deep, rounded sinus ; its outer 

 angles, as seen from above, are obtusely rounded, and the margin is 

 continuous to the inner angle of the orbit, where it passes abruptly 

 downward beneath the ocular peduncle as a sharp ridge, leaving a dis- 

 tinct notch, above which the margin begins again and is continuous 

 to the acutely triangular antero-lateral tooth, which is prominent and 

 directed straight forward. The second tooth of the lateral margin is 

 broad and obtusely rounded and situated above the plain of the ante- 

 rior tooth ; the third and the fourth are slender and acute ; the last is 

 on the postero-lateral margin and is small, acutely pointed and some- 

 what below the level of those just in front of it. The inferior margin 

 of the orbit is straight and finely dentate. The inferior lateral re- 

 gions are granulous and slightly hairy. 



