292 II Richardson — Isopods of the Bermudas. 



backwards in two rounded lobes, one on either side of the median 

 line, and close together. 



The first abdominal segment has two suture lines at either side, 

 indicative of coalesced segments. The terminal segment is very con- 

 vex at the base, and has four small tubercles, forming a square on 

 the convexity. Its apex has a heart-shaped opening, formed b}^ the 

 prolongation of the lateral margins, which prolongations meet an- 

 teriorly, and are divergent posteriorly, so that a triangular excava- 

 tion is formed on the posterior end of the segment immediately 

 below the heart-shaped opening. 



The two branches of the uropoda are similar in shape and size. 

 They are large, very much expanded, rounded posteriorly, with mar- 

 gins distinctly crenulate or denticulate, and extend some distance 

 beyond the tip of the terminal abdominal segment. 



The color is brown, with markings of black. Surface smooth, 

 with the exception of the abdomen, which is very granular. 



A number of specimens (13) were collected by George Brown 

 Goode in 1876-7, at the Bermudas. 



Several specimens differ from the specimen described in not having 

 the 7th thoracic segment produced in lobes, and are without the four 

 small tubercles at base of terminal segment. Several differ in hav- 

 ing the uropoda not longer than the terminal segment. 



The females do not have the heart-shaped opening in the terminal 

 segment. 



Specimens described are in Peabody Museum, Yale University. 

 Cat. No. 3204. 



The above species was described and figured as new, but the 

 manuscript had not been sent to print when Mr. Moore's Report on 

 the Porto Rican Isopoda was published, in which he described 

 Dynamene perforata. 



It was thought best to publish the author's description and figures, 

 for although in the text Mr. Moore mentions the fact that the 

 uropoda are serrate or crenulate, he does not show this in his draw- 

 ings. The figures published here bring out this point. 



Sphaeroma crenulatum Richardson, sp. nov. 



Plate XXXIX. Figure 40. 



Surface of body smooth. Color, light brown, with markings of 

 black. 



Head rounded in front with small median point, on either side of 

 which is small excavation. Eyes situated post-laterally. 



