178 U.S. NATIONAL MUSEUM BULLETIN 258 



In order to show variations of other species and genera, the following 

 diagnosis, based on L. plumosa Boeck, as analyzed by Sars (1895: 

 pi. 16), is given as an interim model: 



Diagnosis of Lysianassa plumosa Boeck. — Upper lip forming a 

 linguiform lobe strongly projecting anterior to buccal bundle, epistome 

 poorly produced but distinctly lamelliform; mandibular cutting edge 

 smooth except for a lateral incision delineating a boss, molar distally 

 located, small, conical, setulose, palp attached distinctly proximal to 

 molar, article 1 elongated and nearly as long as article 3; inner lobe 

 of maxilla 1 lacking distal setae, outer lobe with a single kind of 

 serrate spines (but with only 7 occurring in Sars' figure, thus indicating 

 a second smaller set may be present) ; outer lobe of maxilla 2 half as 

 broad as inner; article 4 of maxillipedal palp slender, about 40% as 

 long as article 3; gnathopod 2 with subchelate palm, not minutely 

 chelate; coxa 1 quite broad, nearly concealing all mouthparts, ex- 

 panded distally; uropod 2 apparently with inner ramus not constricted; 

 uropod 3 slender, long, peduncle longer than telson, not forming a 

 lamellar plate, rami slender, slightly shorter than peduncle; telson 

 linguiform, entire, apex slightly convex. 



Other species appearing to be typical in most of these generic 

 characters are (1) L. cinghalensis (Stebbing, 1897), which, however, 

 has a constricted inner ramus of uropod 2, and which, being based 

 on a male, has an elongated second antennal flagellum and setose 

 rami of uropod 3; (2) L. variegata (Stimpson), based on Stebbing 

 (1888), differing from L. plumosa in the strongly notched telson, the 

 narrower outer lobe of maxilla 2 (appearing to have been drawn in 

 an oblique position), with typical male antenna 2 and uropod 3; (3) 

 L. punctata (Costa), as based on Delia Valle (1893), differing by the 

 incised telson, the asymmetrical expansion of article 2 on pereopod 

 3, the presence of an attenuated, blunt posterior lobe on coxa 4 and 

 a slightly aberrant maxillipedal palp; (4) L. dartevillei Ruffo (1953). 



Species with a slight modification of the upper lip-epistomal com- 

 plex are L. longicornis Lucas (as shown by Chevreux and Fage, 1925), 

 including provisionally L. ceratina (Walker) : the upper lip projects 

 only slightly in front of the epistome because the latter is formed 

 into a short keel projecting along with the upper lip; uropod 2 has 

 a constricted inner ramus but uropod 3 is normal. 



Species with a slight modification of uropod 3 are: (1) L. coelochir 

 (Walker, 1904) with the peduncle slightly lamelliform laterally but 

 as elongated as in L. plumosa, gnathopod 2 with strongly excavate 

 palm, uropod 2 possibly with constricted inner ramus; (2) L. urodus 

 (Walker and Scott, 1903), a species appearing to be distinct from L. 

 cinghalensis by the shapes of pereopods 3-5. 



