CETJSTACEA OF THE MEEGUI ARCHiPELAaO. 9 



1. DOCLEA HTBRIDA, Fair. 



Inachus hybridus, Fabricius, Supplementum EntomologicB systematica, 

 Hafn. 1798, p. 355. 



Doclea hybrida, Milne-Edwards, Histoire Naturelle des Crustaces, t. i. 

 1834, p. 294. 



(Compared, by me witli the typical specimen of Fabricius, pre- 

 served in tbe Museum of the University of Kiel.) 

 One fine female specimen was collected at Sullivan Island. 

 The length of the cephalothorax* measures about 35 millim., 

 vs^hile the breadth amounts to 34 millim., the lateral spines being 

 excluded. The cephalothorax, vrhich appears nearly circular, 

 has an extremely convex and semiglobular upper surface, vphich 

 bears many dentiform tubercles ; the v^oolly down with which 

 this species is covered is only observed in this specimen near the 

 antero-lateral margins. The rostrum, which is a little broken 

 off at the tip, is short, though not shorter than that of Doclea 

 ovis, as figured in Milue-Edwards's ' Eegne Animal de Cuvier,' 

 plate 33; it is 6 millim. long from the tip to a transverse line 

 which unites the two internal angles of the fissures that are 

 found in the upper margins of the orbits, while this transverse 

 line, which I regard as the base of the rostrum, is itself 9 millim. 

 long. The antero-lateral margins are armed with four rather 

 short though acute spines ; the second spine is the smallest, 

 the third is a little longer than the first, and the last spine is still 

 somewhat longer and larger than the third, measuring 3| millim., 

 directed transversely outward (not forward), and being exactly 

 equidistant from the external orbital angle and the base of 

 the spine with which the posterior margin of the carapace is 

 armed. The latter spine is very short, measuring only 2 millim., 

 so that it is as long as the third antero-lateral spine and directed 

 horizontally backwards. The interregional grooves on the upper 

 surface of the cephalothorax are rather strongly marked, so that 

 the regions are very distinct. The upper surface of the cephalo- 

 thorax is armed with many short, rather obtuse, dentiform 

 tubercles, which are arranged in the following manner : — First 

 seven tubercles of equal size are placed in a longitudinal row on 

 the median line of the upper surface, viz. five on the gastric, one on 

 the cardiac, and one on the anterior part of the intestinal region. 



* Longitudinal distance from the posterior margin to a line which unites 

 the eyes, so that the rostrum and the spine of the posterior margin are 

 excluded. 



