310 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



situated post-laterally. First pair of antennae extend to the posterior 

 margin of the first thoracic segment; first joint of peduncle, oblong; 

 second joint, short. Second pair of antenme extend to the posterior 

 margin of the third thoracic segment. 



The first thoracic segment is longer than any of the following seg- 

 ments. The epimera are twice as broad as long. 



The first abdominal segment is short and bears indications of three 



coalesced segments. There are three 

 transverse elevations on this segment 

 which are densely covered with granules. 

 The terminal segment bears three trans- 

 verse elevations at the base, the median 

 one terminating in a spine. On its pos- 

 terior margin is a quadrangular excava- 

 tion, with a long median tooth, bearing a 

 spine at its extremity. At the base of 

 FIG. 335.-ciLic.EA GRANULOSA. LAST the tooth is a small elevation. On either 

 THORACIC SEGMENT AND ABDOMEN. s {fe o f th e terminal excavation, a short 



x 8 



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, blunt at the extremity, somewhat incurved, and 

 reaches, when open, much bej^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, ambulatory. 



One specimen from Cerros Island, Lower California, was collected 

 by Mr. A. W. Anthon} 7 at a depth of 20 fathoms. 

 "Type. Cat. No. 22649, U.S.N.M. 



CILIC^A CORDATA Richardson. 



Cillcfea cordata RICHARDSON, Proc. U. S. Nat. Mus., XXI, 1899, pp. 839-840. 

 Dynamene tuberculosa RICHARDSON, Proc. U. 8. Nat. Mus., XXI, 1899, p. 833. 

 Cilicsea cordata RICHARDSON, Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 184-185. 

 Dynamene tuberculosa RICHARDSON, Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 176- 



177. 



Cilicsea cordata RICHARDSON, American Naturalist, XXXIV, 1900, p. 224. 

 Dynamene tuberculosa RICHARDSON, Am. Naturalist, XXXIV, 1900, p. 223. 

 Dynamene cordata HOLMES, Proc. Cal. Acad. Sci. (3), III, 1904, pp. 302-303. 



Localities. Catalina Island, California; Popoff Island; Monterey 

 Bay, California; Aleutian Islands; Bodega Bay, California; Gualala, 

 Mendocino County, California. Found in low water; dredged; in 

 pink coralline at low tide. 



Occurs on Haliotis rufescens. 



Depth. 30 to 40 fathoms, in sandy mud. 



On the authority of Prof. S. J. Holmes, who has collected specimens 

 of this species, Dynamene tuberculosa and Cilicsea cordata represent 



