318 BULLETIN 129^ UNITED STATES NATIONAL MUSEUM 



Diagnosis.— C&r&ipSice with six median spines. Dorsal tubercle3 

 few. A'spine at angle of buccal cavity. 



Description. — Very much like L. emarginata, but with a more 

 pyriform carapace and fewer spines. There are but 6 median spines, 

 of which 2 are gastric, 1 genital, 2 cardiac, and 1 intestinal; the 

 preorbital, pterygostomian and lateral spines are stronger than in 

 emarginata, but the spiniform tubercles are few or wanting altogether, 

 and the rostrum is slightly longer and more definitely bifid. Antero- 

 lateral angle of buccal cavity armed with a spine. „ 



Very small specimens, less than 10 mm. long, of duhia and emar- 

 ginata, are difficult or impossible to differentiate. 



Measurements.— Total length of carapace of large male (15824) 

 101.6 mm., width including spines 89.1 mm. 



Hahitat. — On muddy shores; has nearly the same habits as L. 

 emarginata. 



Variation. — Extremely variable as to length of dorsal spines and 

 tubercles. 



Range. — From Cape Cod, Massachusetts, to Texas; Cuba. West 

 Africa (Streets). Shallow water to 25 fathoms. 



Brito Capello," gives for L. distincta 

 the locality " Chile," which is an error, as 

 A. Milne Edwards said in 1878," for 

 Cuba. The holotype of L. subspinosa 

 Streets, " Chile," is probably one of the 

 FIG. io6.-LiB.NiA DUBiA. YOUNG FE- saiue lot of specmicns as the type of L. 



MALE (40176), TOTAL LENGTH OF CARA- distiuCta GueriU. 



PACE 35.5 MM., PROFILE. (AFTER l/f j ' 7 'J 



Smith, ms.) Material examined. — 



Vineyard Sound, Massachusetts; U. S. 

 Fish Comm: 1875; 1 female, figured (40176). Sept. 3, 1875; 1 

 young (40746). 



Woods Hole, Massachusetts; .US. Fish Comm.: 1882; 29 speci- 

 mens (4905). Caught in fyke-net; October, 1882; V. N. Edwards; 

 1 large male (5839). Vicmity of; 1911; 1 male (43813). 



Mattapoisett Harbor, Massachusetts; November, 1882; W. Nye 

 jr.; 2 young males (15121). 



Newport, Rhode Island; shore; 1880; U. S. Fish Comm.; 2 young 

 (40112). 



Narragansett Bay, Rhode Island; Beaver Tail Light, SW. J4 W., 1% 

 mile; 123^ fathoms; S. G.; temp. 68° F.; September 1, 1880; 

 station 851, Fisli Hawk; 2 young (54444). 



Noank, Connecticut: 1874; U. S. Fish Comm.; 1 male, figured 

 (40177); 1 young (40738). 



Great South Bay, Patchogue, Long Island, New York; October, 

 1884; T. H. Bean; 1 female with mollusk attached (8915). 



" Jorn. Sci. Lisboa, vol. 3, no. 12, 1871, p. 263. " Crust. R6g. Mex., 1878, p. 129. 



