180 U.S. NATIONAL MUSEUM BULLETIN 258 



moderately stout, short, peduncle subequal to telson in length, 

 partially expanded into a lamellar plate laterally, rami slender, 

 short, not longer than peduncle; telson linguiform, entire, apex 

 slightly convex. 



Arugella differs from L. plumosa in uropod 3, but several species 

 now assigned to Lysianassa intermediate the differences and some 

 species of Lysianassa are identical with Arugella in this character. 

 The dimorphism of spines on maxilla 1 forms the principal difference 

 between Lysianassa and Arugella but that may be figmentary if 

 Sars failed to illustrate them for L. plumosa. Lysianassa falklandica 

 K. H. Barnard (1932) apparently was transferred to Arugella by 

 Pirlot (1939) on the presumption of a close relationship 

 to A. bispinosa 



The genus "Shoemakerella", as diagnosed in sequel, is figmentary in the 

 sense, as pointed out by Hurley (1963), that Pirlot (1936) designated 

 Lysianassa nasuta Dana as its type and assumed that Lysianax 

 cubensis Stebbing (1897) was a junior synonym of L. nasuta. Thus, 

 the diagnosis of the genus is in reality based on L. cubensis and the 

 type species, L. nasuta, remains obscure. 



Diagnosis of Shoemakerella "nasuta" (Dana) of Pirlot (1936), not 

 Dana (=Lysianax cubensis Stebbing, 1897 as senior synonym). — 

 Upper lip forming a linguiform lobe projecting in front of epistome; 

 mandibular cutting edge with a deep incision delineating a lateral boss, 

 molar located rather distally, practically obsolete, forming a small 

 hump armed with a stout seta, otherwise setulose, palp attached 

 proximal to molar, article 1 not elongated, about half as long as article 

 2 ; inner plate of maxilla 1 lacking setae, outer plate with a single kind 

 of spine; outer lobe of maxilla 2 half as broad as inner, the inner lobe 

 especially flabellate; article 4 of maxillipedal palp nearly half as long 

 as article 3, relatively stout; gnathopod 2 with subchelate palm; coxa 

 1 very broad, nearly concealing mouth-parts, expanded distally; 

 uropod 2 with constricted inner ramus; uropod 3 stout, short, peduncle 

 subequal to telson in length, lamelliform laterally, rami slender, short, 

 not longer than peduncle; telson linguiform, entire, apex truncate and 

 slightly concave. 



The provisonal Shoemakerella differs from L. plumosa by the short 

 uropod 3, its lamilliform peduncle, the flabellate inner lobe of the 

 second maxilla, the short first mandibular palp article and the obsoles- 

 cent mandibular molar. It is connected to Lysianassa by L. 

 hummelincki but the mouthparts of that species have not been de- 

 scribed. It differs from Arugella by the single kind of spine on the outer 

 plate of maxilla 2. 



Diagnosis of Lysianopsis alba Holmes (see 1905). — Upper lip 

 forming a linguiform lobe projecting in front of epistome; mandibular 



