1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 63 



TRACHVMAIA CORNUTA, A. Milne-Edwards 



Trachi/maia corinita, A. Milxe-Edwahds, Crust, dn Mi'xi(ine, I, ]>. HH^, ])1. xxxi 

 a', lig. 2, 1S80. 



The single si)ecinieu collected by the Albatross is larger tiian that 

 tigured by A. Milne-Edwards. The carapace is rough with spiniiles, 

 and covered with soft bristles. The four spines on the gastric region 

 form a transverse diamond; there arc two median spines close together 

 on the cardiac region; five spines on the branchial region, three near 

 the inner margin and two near the outer ; one hepatic and one subhepatic 

 spine. On the posterior margin of the carapace is a line of twcntyfixe 

 small spines terminating above the lirst ambulatory leg; of this row the 

 median spine and two near the middle are larger than the others. On 

 the margin of the branchial region there is a line of four spines extend- 

 ing forward from above the lirst aml)ulatory leg. On the pterygostomian 

 region there is a cluster of four spines. The rostral spines are longer, 

 more slender, and more divergent than in A. Milne-Edwards's figure. 

 The pra'orbital spine is acuminate; the postorbital is long, projecting 

 liiterally much beyond the eye. The eyes are large and flattened 

 almost in a horizontal direction. There is a large suborbital spine, and 

 a si^ine at the angle of the buccal cavity. The basal antennal segment 

 bears a terminal and one lateral spine; the secondjointof the flagellum 

 reaches half way to the end of the rostral spines, while the remaining 

 portion of tlie flagellum exceeds the rostrum by half its length. In the 

 abdomen of the male the first segment has three spinules transversely^ 

 arranged; the second has two median and one lateral; the third and 

 fourth have a median tubercle. Sternum with four spinules in front of 

 the abdomen . 



The chelipeds are nearly twice the length of the carapace; ischium, 

 merus, and carpus spiny. Manus broad; npjier margin with a small 

 spine near the carpus and at a little distance a minute spinule visible 

 with the glass; lower margin with a tooth near the articulation. Fin- 

 gers flattened laterally, broad, toothed on the prehensile edges, acute, 

 narrowly gaping for half their length. Ambulatory legs slender, with 

 scattered bristles, the flrst nearly three times the length of carapace, 

 the fourth about one half tlie length of the first. Other legs missing. 



Measurements. — Length, IS mm,; width, without spines, 13; length of 

 rostral horns, 3.2; length of cheliped 33.5; length of first ambulatory 

 leg, 52; length of fourth, to articulation of dactylus, 21. 



i.om///^.— Little Bahama Bank, hit. 27° 22' K, long, 78° 07' 30" W., 

 338 fathoms, gray sand, temp. 47.5°, May 2, 1886, station 2()55; one 

 male (11400). 



I have examined three small specimens from the Blale collection in 

 the Museum of Comparative ZocUogy and find that they agree with 

 the one above described in the very slender rostral spines and the rela- 

 tive length of the antennal joints, and also possess si)inules on the 

 upper margin of the manus. 



