354 



THE GENUS CALLINECTES—M. J. BATHBUN. 



vol.. xvin. I 



Measurements of CaUinecfes sapidus. 



Locality. — Callinectes sapidus is comnioii iu bays and at the mouths 

 of rivers from Cape Cod to Texas, and is especially abundant in (Chesa- 

 peake Bay. Beyond these limits it is of rare occurrence. It is found 

 occasionally in Massachusetts Bay,^ and a single individual is recorded 

 from the Millpond, an inlet of Salem Harbor.^ Three specimens in 

 the National Museum are from brackish water at Sing Sing, New 

 York, collected by Prof. S. F. Baird. The following localities from 

 which specimens have been examined are also worthy of notice: 



Jamaica: U. S. Fish Commission (No. 7679, U. S. N. M.); Kingston Harbor 

 (No. 17976, U. S. N. M.), Dr. R. P. Bigelow ; mouth of Rio Cobre. fresh water 

 (No. 18244, U. S. N. M.), Dr. R. P. IM.i-elow. 



Bermiiflas: Bickmore (Mus. Comp. Zool.). 



Brazil: Rio Grande; Capt. Harrington, .lune, 1861 (Mus. Comp. Zool.). 



A fossil G.allineMes (Plate XXVIII) was picked up on Gaugatha 

 Beach, Accomac County, Virginia, September, 1804, by Mr. James P. 

 Lucas, of Baltimore. It may have come from the extensive Miocene 

 beds along that coast. The outline of the carapace is not preserved. 

 The ventral surface indicates that the species is very near, if not iden- 

 tical with, C. sapidus, although the penultimate segment of the abdo- 

 men is narrower than is commonly seen in that species, and the median 

 groove of the sternum is deeper and longer. 



Southern specimens of C. sajtithis show a tendency to develop sharper 

 teeth or spines. This deviation culminates in two lots of specimens 

 from Brazil, which I designate as a subspecies. 



CALLINECTES SAPIDUS ACUTIDENS, new subspecies. 



(Plates XIII; XXIV, lig 2.) 



In this subspecies the carapace is wider and all the prominences are 

 more strongly marked than in the typical C. sapidus. The areolations 

 are separated by deeper depressions, the granules are more raised, the 

 gastric ridges are stronger and more sinuous. There is a transverse 

 granulate ridge on the cardiac lobes. The frontal teeth are narrower 

 and more acute, and there are two small intervening teeth (Plate 

 XXIV, fig. 2). Subfroutal and suborbital spines acuminate. Lateral 

 teeth broad at base, narrowing abruptly to long, acuminate tips ; margins 



' The length is measured from the nu'dian sinus of the front. 



"Smith, Rept. U. S. Commr. Fish and Fisheries, 1871-1872, p. 548 (1874). 



•'C. Cooke, Amer. Na"!., I, p. 52, 1867. 



