526 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



hepatic region. Basal article of outer antennae very short, not 

 reachmg or barely reaching the prolongation of the front. Merus of 

 outer maxilHpeds wider than long, anterior border concave, inner 

 emargination obtusangled. Buccal cavity wide anteriorly; endo- 

 stome with a sharp crest on each side. Abdomen of seven distinct 

 segments. 



LOBOPILUMNUS AGASSIZn (Stimpson) 

 FORMA TYPICA 



Plate 211, Figures 1 and 2 



Pilumnus agaasizii Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 142 (type- 

 localities, between East and Middle Keys, Tortugas, 5 to 7 fathoms, and 

 east of the Tortugas, 13 fathoms; types not extant). 



FORMA PULCHELLA 



Plate 211, Figure 3 



Lobopilumnus pulchellus A. Milne Edwards, Crust. R6g. Mex., 1880, p. 299, 

 pi. 52, figs. 4a and 5 (type-locality, Florida reefs; cotypes in M.C.Z., cotype 

 from Sombrero in Paris Mus.). 



FORMA BERMUDENSIS 



Plate 211, Figure 5 



Lobopilumnus agassizii A. Milne Edwards, Crust. R6g. Mex., 1880, p. 298, 



pi. 52, fig. 4r-4c (Florida reefs, Bermudas). 

 Lobopilumnus agassizii bermudensis Rathbun, Bull. Lab. Nat. Hist. State Univ. 



Iowa, vol. 4, 1898, p. 269 (type-locality, Bermuda; type. Cat. No. 42798, 



U.S.N.M.). 

 Lobopilumnus agassizii bermudensis A. Milne Edwards and Bouvier, Mem. 



Mus. Comp. Zool., vol. 47, 1923, p. 319. 

 Lobopilumnus agassizii var. bermudensis Verrill, Trans. Connecticut Acad. Arts 



and Sci., vol. 13, 1908, p. 360, pi. 14, figs. 1 and 2. 



FORMA TRINIDADENSIS, new 



Plate 211, Figure 4 



See below. 



Diagnosis of species. — Carapace rough and hairy. Marginal teeth 

 sharp, divergent. Frontal lobes denticulate. Chelae thickly tuber- 

 culate. 



Description of typical jorm. — Areolets of carapace protuberant. 

 Surface pubescent everywhere except on the anterior and antero- 

 lateral areolets which are naked and thickly granulated. The depres- 

 sions between the protuberant areolets are broad, occupying fully as 

 much space as the areolets themselves. Two of the areolets form 

 the broad lobes of the front, which are as large and prominent as the 

 epigastric lobes, or even larger. Frontal surface vertical, not much 

 projecting, but the lobes are deeply separated from each other and 

 from the small lobules at the outer ends of the front. Orbital region 

 protuberant and granulate; margin not toothed, but crenulated with 

 granules, not advanced at outer angle, and marked by two fissures 

 above and one less conspicuous one below. The antero-lateral margin 



