THE SPIDER CRABS OF AMERICA 335 



LISSA BRASILIENSIS Rathbun 



Plate 73, fig. 2 



Lissa brasiliensis Rathbun, Proc. U. S. Nat. Mus., vol. 64, art. 14, 1923, 

 p. 4 (type-locality, off Cape Frio, Brazil; 35 fathoms; Hassler Exped.; 

 holotype, female. Cat. No. 2055, M. C. Z.). 



Diagnosis. — Carapace nodose; two large branchial protuberances; 

 surface rough with granules; front strongly widened anteriorly. 



Description .^Carapace hairy and granulate, the granules separ- 

 ated except on the summit of the protuberances where they are 

 larger and more or less confluent. The protuberances are arranged 

 as in L. tuherosa, but the terminal protuberance of the branchial 

 ridge is more transverse and the posterior, deflected portion of the 

 carapace is broader, its margin more arcuate. Two small antero- 

 lateral teeth, one hepatic, one branchial. Rostrum with surface 

 concave from side to side, widening distally, anterior margin in the 

 form of a cupid's bow, with a small median emargination and the 

 outer angles directed upward in a stout, curved, blunt spine. 



Only one crest on the carpus of the chelipeds, and a small tubercle 

 outside the crest; two crests on the carpus of the ambulatory legs. 



Measurements. — Female, holotype, length of carapace 16.6, width 

 15 mm. 



Range.— Known only from the type-specimen. 



Subfamily Majinae 



Maiinae Alcock, Journ. Asiat. Soc. Bengal, vol. 64, 1895, pp. 161, 166 and 



236. 

 Mamaiidae Stebbing, Marine Invest. S. Africa, vol. 4, Cape Town, 1905, 



p. 22. 



Eyes either (1) with orbits, which may be incomplete or complete, 

 but are always complete enough to entirely conceal the fully re- 

 tracted cornea from dorsal view; or (2) but partially protected by a 

 huge hornlike or antlerlike supraocular spine, or by a large jagged 

 postocular tooth or by both. The eyestalks are usually long. 



The orbit, when present, is formed in one of two ways; there is 

 always an arched, often very strongly arched, supraocular eave, 

 and a prominent postocular spine; and either (1) the interval be- 

 tween the eave and the spine is filled by another spine, in which case 

 the roof of the orbit, though fissured is fairly complete; or (2) the 

 supraocular eave and the postocular spine are in contact with one 

 another above, and below with a process of the basal antennal 

 article, in which case the orbit has not only a complete or nearly 

 complete roof, but a complete or nearly complete floor also. 



The basal antennal article is always very broad, and is either very 

 extensively produced outwards to aid in forming the floor of the 

 orbit, or is armed distally with one or two large spines. 



