404 PROCEEDINGS OF THE ACADEMY OP [1879. 



sembling L. cariosa in form. Inner portions of branchial and car- 

 diac regions moderately protuberant. Hepatic region but slightly 

 excavate, the ridge crossing it being broad, low, and rounded, 

 otherwise as in L. cariosa. Front elevated, and connected with 

 cardiac region by a broad rounded ridge (in cariosa this ridge is 

 narrow and more abrupt) ; a small tooth on the postero-lateral 

 margin. The sulcus separating the cardiac from the branchial re- 

 gion is well marked, but not so much as in cariosa. Chelipeds 

 with small tubercles. Abdomen of the male with a strong tooth 

 directed backward, arising from the proximal margin of the penult 

 joint. 



A male from Sarasota Bay gives the following measurements: 

 Length of carapax 9.7 mm., breadth 11.1 mm., ratio 100 : 135. 



This species differs from cariosa in the broader carapax, the 

 ornamentation, and more even surface ; from pontifera in lacking 

 the " bridged" fossse between the cardiac and brachial regions ; 

 from cadaverosa in more even carapax and ornamentation, and in 

 having but one tooth on the antero-lateral margin ; from cubensia 

 in having the meros of the chelipeds subcylindrical, and not ex- 

 panded behind. 



DROMIOIDEA. 



Family DROMIID.S3. 



Genus DROMIDIA Stm. 

 Dromidia antillensis Stm. 



Dromidia antillensis Stm., Proc. Phila. Acad., 1858, p. 225 ; Ann. 

 Lye. vii. p. 71. 



A single specimen from Key West. Other localities are Tor- 

 tugas and Key Biscayne (Stm.), St. Thomas, and Abrolhos, Bra- 

 zil (Smith). 



Genus HYPOCONCHA Guerin. 

 Hypoconcha arcuata Stm. 



Hypoconcha arcuata Stm., Proc. Phila. Acad., 1858, p. 226 ; Ann. Lye, 

 vii. p. 72. 



Professor Webster collected specimens at Florida and Sarasota 

 Bays. I have seen others from Key West (A. S. Packard, Jr.). 

 Stimpson had specimens from South Carolina and St. Thomas. 

 It seems to me that both Guerin and Stimpson are right in ex- 

 plaining the manner in which this crab holds the protecting shell, 



