

TERTIARY DECAPOD CRUSTACEANS. 175 



The following is a description of this species: 



The dactylus has the characteristic grooving common to small specimens 

 of most of the Recent species of Callinectes. Further than the genus it is 

 impossible to identify the specimen. The grooves are as follows: 3 outside, 

 about equally spaced, and the lowest very shallow; 1 above, fading out dis- 

 tally, but the punctse are continued; 3 inside, the upper groove very short, 

 proximal, the middle one deep. 



Genus PODOPHTHALMUS Lamarck, 1801. 



Podophthalmus domingensis, new species. 



(Plate 2, Figures 7 and 8.) 



Type locality. Lower half of the valley of the Yaqui del Norte 

 River, in the northern part of Santo Domingo, Haiti; probably lower 

 Miocene; W. M. Gabb, collector. 



Holotype.C&i. No. 2265, Mus. Phila. Acad. Nat. Sci. 



Measurements. Length of carapace exclusive of rostrum 38.3 mm. ; 

 length including rostrum 42.4 mm. ; width between tips of outer spines 

 of orbits 66 mm.; width between tips of spines at middle of carapace 

 72.2 mm. ; approximate length of propodus of cheliped 62 mm. ; distal 

 height of manus exclusive of spine 24 mm. ; length of dactylus measured 

 from external articulation with manus 40.2 mm. 



The following is a description of this species : 



Carapace transversely oblong, armed with a strong spine at the antero- 

 lateral angle or outer angle of the orbit and a shorter spine at the lateral angle 

 of the carapace, from which a transverse ridge bearing a single line of granules 

 extends inward across one-third of the carapace; a blunt transverse ridge 

 across the gastric region, and a rounded elevation on the inner part of the 

 branchial region; surface granulate except near the posterior and postero- 

 lateral margins and a narrow strip behind the anterior margin and occupying 

 half the width of the carapace. The margins, so far as visible, have a single 

 line of granules; the anterior margin, exclusive of the T-shaped front is straight 

 and transverse for more than half the width of the carapace; it then curves 

 rapidly backward, forming a deep sinus within the antero-lateral spine and is 

 interrupted by a slight notch at the inner end of the sinus; the antero-lateral 

 spine projects forward and very little outward and is less advanced than the 

 anterior margin; the lateral spine projects obliquely outward and forward; the 

 margin between the spines is embedded in the matrix. Frontal projection 

 T-shaped, limits of the cross-piece ill-defined. The long eyes characteristic 

 of the genus are not exposed in the unique specimen. 



Chelipeds slightly unequal. Their brevity would seem to indicate that the 

 specimen is a female. The distal half or more of the merus is lacking; there 

 appear to be granules on the margins and also in longitudinal bands; on the 

 anterior or inner margin there is an erect compressed spine which, when the 

 merus is horizontally placed, is situated close to the end of the antero-lateral 

 spine of the carapace. Of the carpus only the long inner spine shows on the 

 left side (fig. 7) ; it is transversely placed when the cheliped is flexed and is 

 convex above with the point turned downward. The chelae are flattened 

 externally and the outer shell, so far as preserved, is smooth, excepting on the 

 obliquely longitudinal ridge, which leads from the distal articulating condyle, 

 and on the upper margin of the dactylus and the lower part of the inner sur- 



