NO. 1479. 



NEW ISOPOD CRUSTACEANS— RICHARDSON. 



19 



The first thoracic seg'inoiit i.s longer than any of the foHowino- seg 

 ments. The epimera are twice as broad as long. 



The first abdominal segment is short and has indications of three 

 coalesced segments. There are three transverse elevations on this 

 segment which are densely covered with 

 g-ranules. The terminal segment has three 

 transverse elevations at the base, the me- 

 dian one terminating in a spine. On its 

 posterior margin is a <{uadrangular excava- 

 tion with a long median tooth, l)earing a 

 spine at its extremity. At the l^ase of the 

 tooth is a small ehnation. On either side 

 of the terminal excavation, a short distance 

 up the lateral margin, is a small spine. 

 The fixed inner branch of the uropoda is 

 small and short, the outer branch is long, 



l)lunt at the extremit}^, somewhat incurved, and reaches, when open, 

 much be^'ond the terminal segment. 



The margins of the terminal segment and the edges of the outer 

 branch of the uropoda are pubescent. 



The legs are all simple, aml)ulatorv. 



There are but two specimens of this species, both of which are males. 



Fig. 21.— Discerceis granulosa. 

 La.st thoracic segment and abdo- 

 men. X 8. 



Fig. 2'2.— Discerceis granulosa. «, Second pleopod of right .side. :, 52. 6, Third pleopod 

 (exopod). X 52. c, Fourth pleopod. x 51. 



DISCERCEIS LINGUICAUDA Richardson. 



CiliciealingtiicaitdaUicnARiiSO^, Proc. U. S. Nat. Mas., XXIII, 1901, pp. 5S6-587, 



fig. 20; Bull. U. S. Nat. Mas., No. 54, 1905, p. 309, fig. 334. 

 Discerceis Unguicmtda B,iCHARnso^, Bull. U. S. Nat. Mus., No. 54, 1905, p. x. 



Locality. — Cape Catoche, Yucatan. 

 Depth.— "1^-1^ fathoms. 

 Collection of the U. S. National Museum. 

 Bod}^ 3i mm. long: 7 mm. wide. 



