368 THE GENUS PANOPEUS BENEDICT AND RATHBUN. 



It is distiuguisbed from all other species which we have seen, by the 

 convex carai)ace in connection with the lobate teeth and the contact of 

 the coxa? of the fifth pair of feet with the third abdominal segment. 



The si)eclmens examined are from Acajutla, San Salvador, F. H. 

 Bradley (Yale Univ. Mns.). 



Length of carapace in large specimen, 12 millimetres; width, 18 mil- 

 limetres 



11. Panopeus ovatus, sp. nov. 

 (Plate XXIV, tig. 8.) 



We have designated nnder this name nine small specimens of Pano- 

 2)€us from Concepcion Bay, Gulf of California, collected by the U. S. Fish 

 Commission steamer Albatross, March, 1889 (15780). Carapace sub- 

 oval, areolations fairly distinct, not protuberant. Anterior and antero- 

 lateral portions of carapace granulated, the granules not evenly scat- 

 tered over the surface, but thrown into bunches and rugie. Lines from 

 the notches between the antero-lateral teeth run up on the carapace, 

 that from the second separating the hepatic and branchial regions and 

 ending in a rounded depression. Groove between the cardiac and meso- 

 gastric regions conspicuous. 



Front divided by a very slight notch, beveled, the beveled edge cov- 

 ered with granules. Wide median lobes very little produced, slightly 

 rounded. Lateral lobes projecting as small blunt teeth. 



Tiie regular curve of the orbit is broken by two fissures, the space be- 

 tween which is straight or often a little produced. 



Margin of coalesced tooth either straight or a little convex. Outline 

 of the next two teeth nearly straight. Last tooth small, triangular and 

 obtuse. The notches between the antero-lateral teeth are deeper and 

 more widely gaping than in transversus. 



Seventh sternal segment in the male entirely covered by second seg- 

 ment of abdomen. Outline of abdomen straight or very slightly con- 

 cave. Terminal segment rounded. 



Carpus granulate, carpal groove very short. Inner angle of the car- 

 pus not produced, there being but a trace of a tooth. Fingers arched 

 and hooked at the tips, leaving a slight gape. Dactyl of the larger 

 cheliped armed with a very small tooth near its base. Fingers of small 

 hand marked with longitudinal impressed stri;i'. Prehensile edges 

 armed with small irregular teeth. 



This species is closely allied to transversus, but is easily distinguished 

 by the areolated, granulated, and more flattened carapace, and by the 

 wider notches between the teeth of the antero-lateral margin. 



Length of carapace in large specimen, 8 millimetres ; width, 12 milli- 

 metres. 



