224 



BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



LIBIDOCLAEA GRANARIA Milne Edwards and Lucas 



Plates 76-78; plate 231, figs. 1, 2, 4, 5 and 6 



Libidoclaea granaria Milne Edwards and Lucas, d'Orbigny's Voy. I'Am^r. 

 M6rid., vol. 6, pt. 1, Crust., 1843, p. 8; atlas, vol. 9, 1847, pi. 3, pi. 4, 

 figs. 1-16 (type-locality, environs of Valparaiso; type in Paris Mus.). — 

 MiERS, Challenger Rept., Zool., vol. 17, 1886, p. 72. 



Libidoclea coccinea Dana, Amer. Journ. Sci., ser. 2, vol. 11, 1851, p. 268 

 (type-locality, in deep water off eastern Patagonia; type not extant); 

 u! S. Expl. Exped., vol. 13, Crust., pt. 1, 1852, p. 88; atlas, 1855, pi. 1, 

 figs. 3a-3d. 



Libinia coccinea Miers, Challenger Rept., Zool., vol. 17, 1886, p. 73. — Rath- 

 bun, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 574. 



Libinia gracilipes Miers, Challenger Rept., Zool., vol. 17, 1886, pp. 73 and 

 74, pi. 9, figs. 2-2c (type-locality, off coast of Chiloe, 45 fathoms; type in 

 Brit. Mus.). 



Diagnosis. — ^Rostriim bifurcate for less than half its length. Spines 



of carapace moderate, spine at lateral angle less than half as long as 



width of branchial region except in young (16 



mm. long and under), where it is just half as 



long as width of branchial region. 



Description. — Spines and tubercles of cara- 

 pace very unequal; the principal spines are 

 proportionally much longer in the young than 

 in the old. Gastric tubercles 7, 3 median, 

 the middle one of which may almost disap- 

 pear, and 2 on each side in a longitudinal 

 line; a long cardiac spine, a longer intestinal 

 spine, a still longer spine on the lateral mar- 

 gin at the widest part of the carapace and 

 opposite the narrow anterior border of the 

 cardiac region. Hepatic margin produced in 

 a spine. A curved line of tubercles follows 

 the innermost margin of the branchial region; 

 among the larger tubercles of this - region a 

 (21919), MAxiLLiPED, X triangle of 3 near the gastric region is promi- 

 nent; while a still larger spine lies above the 

 postero-lateral margin and in a line with the cardiac spine; from it a 

 row of spines curves downward and then forward and is continued on 

 the subbranchial and the pterygostomian regions, ending in a flat 

 triangular spine at the angle of the buccal cavity. 



Rostrum inclined downward; horns short, moderately spreading. 

 Supraocular eave narrow, armed with a sharp, ascending spine, and 

 divided from the postocular cup by a narrow fissure; this cup in 

 lateral view shows a rounded lobe. This in turn is separated by a 

 broad, curved sinus from the basal segment of the antennae. The 

 segment is anteriorly narrowed and its outer margin is occupied by 



Fig. 86.— Libidoclaea 



RIA 



7.5 



