226 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Off eastern coast of Patagonia; 30 fathoms (Dana). 



Age variation. — A male collected by the Hassler is larger than any 

 previously recorded. The dorsal spines of the carapace are reduced 

 to tubercles, even those of the margin are very short and conical. 

 The rostrum is much wider at base than its length and does not widen 

 at the tip as in the young; horns very short; length of rostrum 9.6, 

 width at base 11.4, width at tips 2.7 mm. The inner margins of 

 the orbits converge anteriorly, the interspace narrowing from 17.6 

 to 14.8 mm. The width of the body, exclusive of spines, in relation 

 to its total length, is greater than in smaller specimens. 



LIBIDOCLAEA SMITHII (Miers) 



Plates 74 and 75; plate 231, fig. 3 



Libinia smithii Miers, Challenger Rept., Zool., vol. 17, 1886, p. 73, pi. 9, 

 figs. 1-lc (J) (type-locality, off coast of Chile, lat. 52° 45' 30" S., long. 

 73° 46' 00" W., 245 fathoms; type in Brit. Mus.). 



Libinia hahni A. Milne Edwards, Miss. Sci. Cape Horn, vol. 6, 1891, 

 Crust., p. 5, pi. 1 ( 9 ) (type-localities. Beagle Channel, in sight of Loupa- 

 taya, 198 meters or 108 fathoms and near Murray Narrows, 280 meters 

 or 153 fathoms; type in Paris Mus.). 



Diagnosis. — Rostrum bifurcate for half its length. Some spines 

 of carapace long, spine at lateral angle about as long as width of 

 branchial region. 



Description. — Differs from L. granaria in the greater length of the 

 rostrum and of certain spines of the carapace. The rostrum in the 

 largest male is nearly half as long as the postrostral portion of the 

 carapace not counting the posterior spine, the horns occupy half 

 the length of the rostrum and diverge widely. The spine at the 

 lateral angle of the carapace is the longest and equals in length the 

 width of the branchial region. Other elongate spines are four median 

 spines, namely, the intestinal, cardiac, anterior, and posterior gas- 

 tric; the hepatic spine; two branchial spines (paired) ; preocular spine 

 (paired). The tubercles of the carapace are fewer and lower than 

 in granaria of similar size. In the females examined the rostral horns 

 are less divergent than in the male, but the long spines of the cara- 

 pace are very little if any shorter than in the male. In the young 

 only six spines are noticeably longer than in granaria of the same 

 size, viz, the two rostral, cardiac, intestinal and lateral branchial 

 (paired) . 



Measurements. — ^Male (21922), length of carapace from posterior 

 margin to tip of horn 43, width including spines 52.1, width excluding 

 spines 29.6 mm. Ovigerous female (21920), length from posterior 

 margin to tip of horn 51.8, width excluding spines 38.6 mm. 



Color. — In spirit, light yellowish brown (Miers). 



Range. — From Calbuco, Chile (Lenz) to Straits of Magellan; 

 depth, 10 to 15 (Lenz) and 61 to 1,050 fathoms. 



Material examined. — See table, page 227. 



