72 U.S. NATIONAL MUSEUM BULLETIN 2 78 



A small male from St. John's bears the normal pair of cephalic 

 spines, but the body is otherwise different in spination. The pair of 

 dorsal spines at midlength on pereonite 2 are represented by a single 

 long spine. It also bears a single dorsoposterior spine and the antero- 

 lateral projections are absent. Pereonites 3 and 4 bear a single large 

 dorsal spine at midlength, a single dorsoposterior spine, and pleural 

 development is indistinct. Pereopod 4 is uniarticulate. The other 

 characters of this specimen agree with those of L. incerta. 



Distribution. — Type-locality: Off Mobile Bay, Ala., Albatross 

 sta. 2387, 29°24' N., 88°04' W., 59 m, 1 male lectotype, 1 male 

 paralectoypte USNM no. 26000. 



Other records: Woods Hole, Mass.; Bermuda; Straits of Florida; 

 several localities between the mouth of the Mississippi River and 

 Cedar Keys, Fla, 



New records: Many occurrences from Woods Plole to Key Largo, 

 Fla.; Port Ai'ansas and Port Isabel, Tex.; off Yucatan; Virgin Islands; 

 Barbuda; Barbados; Isla de Margarita; Aruba. 



Terminal article of pereopods 3 and 4 setose, basal article sometimes 

 with distal setae. Pereopods 5-7, 6-segmented, propodus without 

 palmar surface on pereopod 5; pereopods 6 and 7 more robust than 

 pereopod 5, propodus with pair of proximal grasping spines. 



Abdomen of male with pair of uniarticulate appendages and pair 

 of setose lobes, appendage with small apical papillae surrounded by 

 fringe of small teeth; female abdomen without distinct lobes. 



Variation. — This species varies considerably in the degree of body 

 spination. Larger individuals bear a pair of dorsal cephalic spines, a 

 pair of dorsal spines at midlength, and an anterolateral projection 

 on pereonite 2 and an anterolateral pleural projection on pereonites 

 3 and 4 of the male and on pereonite 3 of the female. 



Remarks. — I have designated a lectotype from Albatross sta. 2387. 

 The remaining syntypical series of Mayer's are now designated as 

 paralecto types and their localities are as follows: USNM 26001, 

 1 male and 1 female from Albatross sta. 2389, 29°28' N., 87°56' W., 

 49 m; USNM 9709, 1 female from Albatross sta. 2390, 29°27'30" N., 

 87°48'30" W., 55 m; and USNM 26002, 1 juvenile female from 

 Vineyard Sound at Woods Hole. 



This species is widely distributed in the temperate and tropical 

 areas of the western North Atlantic and has occasionally been taken 

 in plankton tows. It has been collected on mangrove roots, Sargassum, 

 Thalassia, sponges, hydroids, alcyonarians, and ascidians. 



Mayerella Huntsman, 1915 



Flagellum of antenna 2 biarticulate, swimming setae absent; 

 mandibular palp 3-segmented, setal formula for terminal article 1, 



