500 



BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



basal segment itself, is narrower, and its outer margin, though 

 thickened, does not project laterally in a lobe as in platysoma. The 

 laminiform process on the hepatic region is not entirely flat, and 

 has a tooth at the anterior end which projects outward but not 



forward except in a large specimen. The 

 flattened, lateral process on the branchial 

 region is not as sharply defined as in 

 platysoma, and is devoid of a rimmed 

 edge. Besides the two spines at the 

 widest part of the carapace characteristic 

 of platysoma, there is a spine below the 

 margin which forms a broad triangle 

 with the other two. Four, instead of 

 two, tubercles are equally enlarged on 

 the intestinal region. 



Measurements. — Male, holotype, entire 



length of carapace 14, length of horns 



Fig. 141.— micbophrys antillensis, 2.4, width of carapace including spines 



11.6, excluding spines 10.5 mm. Male 

 (51032), entire length of carapace 18.3, 

 length of horns 3.3, width of carapace including spines 15.6, excluding 

 spines 14 mm. 



Range. — North Carolina; Cuba; Jamaica; Porto Eico. 

 Material examined.— See table, page 499. 



MALE (43017), TOTAL LENGTH OF CARA- 

 PACE 14 MM., BASAL ANTENNAL ARTICLE 



MICROPHEYS ACULEATUS (Bell) 



Plate 271, fig. 1 



Pisa aculeata Bell, Proc. Zool. Soc. London, vol. 3, 1835 (1836), p. 171 



(type-locality, Galapagos Islands; type not extant); Trans. Zool. Soc. 



London, vol. 2, 1836, p. 50, pi. 9, fig. 7. 

 Milnia aculeata Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860^ 



p. 52. 

 Microphrys aculeatus A. Milne Edwards, Crust. R6g. Mex., 1875, p. 63. — 



Rathbxjn, Proc. U. S. Nat. Mus., vol. 38, 1910, pp. 536 and 574, pi. 



45, fig. 4. 

 Microphrys platysoma Rathbun, Proc. Washington Acad. Sci., vol. 4, 1902, 



p. 285 (part: Galapagan specimen); Proc. U. S. Nat. Mus., vol. 38, 1910, 



pp. 535 and 574 (part: Peruvian and Galapagan specimens, not pi. 



50, fig. 3). 



Diagnosis. — Carapace short and broad, tubercles few. Two raised 

 disks on antero-lateral wall. Four spines on each branchial region, 

 two marginal. No tooth or lobe on basal antennal segment behind 

 antero-external spine. 



Description. — Carapace shorter and broader than in platysoma; 

 hairy; when the hairs are removed the surface is seen to be covered 

 with small pits. Tubercles and granules few; an arch of 5 tubercles 



