534 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxih. 



89. SPHiEROMA DESTRUCTOR Richardson. 



Sphrssroma destructor Richardson, Proe. Biol. Soc. Wash., XI, \>. J05, 1897. 

 Habitat.— ^t. John's River, Pahitka, Florida. 



90. SPHiEROMA YUCATANUM, new species. 



Head tran.sverse; ej^cs situated at the extreme post-lateral angles. 



First pair of antennae short, reaching the posterior margin of the head; 



flagellum six-jointed. Second pair of antennte, with a llagelhini 



containing ten joints, extends to the posterior 



margin of the second thoracic segment. 



First thoracic segment long<>r than any of the 

 following segments, its post-lateral angles pro- 

 duced. The remaining segments of equal length; 

 epimera produced laterally into acute processes. 

 Fig. 15.— Abdomen of First abdominal segment with suture lines. Last 

 spH^ROM.i YucATA- segmcut terminating posteriorly in an obtuse point, 

 on either side of which is a small tooth. The basc^ 

 of the segment l)ears three low tubercles, one on the median line and 

 one on either side. The uropoda are short, not reaching the post- 

 lateral teeth. Both ])ranches are equal in length and width, the outer 

 branch pointed, the inner ])ranch truncate. 

 Surface of body smooth; color bluish. 

 One specimen was taken at Cape Catoche, Yucatan. 

 Ti/pe.— Cat. No. 2^5905, U.S.N.M. 



38. DYNAMENE Leach. 



ANALYTIC.VL KEY TO THE SPECIES OF DYNAMENE. 



a. Terminal abdominal segment with only a slight rounded excavation at its 

 extremity. Extremity of terminal segment and outer posterior angles of 

 uropoda rounded, not produced 91. Dijnaineve hermudens'is (Ives). 



rt'. Terminal abdominal segment with a deep V shaped excavation at its extremity. 

 Extremity of terminal segment and outer posterior angles of uropoda 

 acutely produced 92. IfiiiKiirinw anrpilntn, new species. 



91. DYNAMENE BERMUDENSIS (Ives). 

 Ctjmodocea tiermiidensis Ives, Proc. Acad. Nat. 8ci. Phila., 1891, p. 194. 

 Ilabitat. — Bermudas ; Punta Rassu, Florida ; Cedar Keys, Florida ; 

 Key West, Florida; No Name Key, Florida ; Sarasota Bay, Florida; 

 Beaufort, North Carolina. 



92. DYNAMENE ANGULATA, new species. 



Surface of ])ody smooth ; color yellow. 



Head large, with small median point on its anterior margin. First 

 pair of antenna? reach the posterior margin of the second thoracic 

 segment ; liagellum composed of nine joints. Second pair of antennaB 



