64 CEABS OF THE FAMILY INACHTDM—M. J. EATHBVN. vol. xvii. 



LLSPOGNATHUS THOMSONI, (Norman). 



Dnrijnclius thomsoni, Norman, in Thomson, Depths of the Sea, p. 174, cut, 1873. 

 Llspoiinaihus thomsoiii, A. Milne-Edwakds, (Arch. Miss. Sci. Litt., ix, pp. 16, 39, 

 1882). MiEHS, Challenger Eept., Zool., xvii, p. 28, PI. v, fig. 2 (variety), 

 1886, aud syuouymy. — Smith, Eept. U. S. Commr. of J'isheries for 1885, p, 

 622, 1887, and synonymy. 

 Locality.— 0& Georgia., Lit. 30° 44' N., long. 79° 20' W., 440 fatlioms, 

 coral, coarse saud, sliells aiicl foraminifera, temperature 45.0°, April 1, 

 1885, station lUlo, U. S. Fisli Commission steamer A /irt/ro.ss; 1 male, 

 1 female (18119). 



These specimens have been compared with a, female from station 

 2202, oif Martha's A'ineyard (Smith, Joe. cit.). They are about the same 

 size and api)areutly the same species. 



HOLOPLITES, new genus. 



Carapace pyriform, covered with sharp spines of unequal length. 

 Rostrum composed of two long, slender, divergent horns. Prjcorbital 

 spines long. Orbits open, spinous. Basal autennal segment very nar- 

 row, spinous. Antero-internal angle of the merus of the maxillipeds 

 oblique, not notched for the articulation of the palpus. Abdomen of 

 female with the fourth, fifth, and sixth segments coalesced. Chelipeds 

 and meral joints of ambulatory legs spinous. 



This genus resembles UcJii)i<>pJa.r, Miers, in many respects, but does 

 not possess accessory spinules on the rostrum. It differs from Nihllia 

 in the very incomplete orbits, the narrow basal antcnnal segment, tlie 

 number of abdominal segments in the female, as well as in the form of 

 the maxillipeds. 



HOLOPLITES ARMATUS. ( A. M i 1 n e - E d w a r d s). 



NihiliK (iriiiata, A. Milnk-Edwauds, Crust, du Mcxi(inc, ]>. 318, }d. xxxi A, fig. 3, 



1880. 



One specimen (18120), a female with eggs, from station 2152, two and 

 a half miles northwest of Havana Light, 387 fathoms, coral, tempera- 

 ture 49°. 



The spine above the orbit is nearer the i)ostorbital tliaii the prjTe- 

 orbital, and is longer than represented in A. Milue-Edwards's figure. 

 There is also a subhepatic spine. The rostrum of the Albatross speci- 

 men is longer proportionally than the one figured and is not divided 

 to its base. The first three segments of the abdomen in the female are 

 very narrow and have each a median spine, diminishing in length from 

 the first to the third; the second and third segments have lateral spin- 

 ules, which are almost imperceptible on the third; fourth segment very 

 large and smooth; terminal segment broadly rounded ist the extremity. 

 The abdomen has scattered hairs like the rest of the surface. 



Measurements. — Length, including rostrun), 23.5 mm.; length of ros- 

 tral spines, 8; width, without spines, 11; width, including spines, 10. 



