150 THE VOYAGE OF H.M.S. CHALLENGER. 



is armed with a pair of short spines placed behind the base of the rostrum.^ The cardiac 

 area is somewhat triangular in outline, and considerably elevated, with its highest point 

 surmounted by a broad conical spine, while a second spine of smaller size is occasionally 

 present behind the first ; a few spinules are present on the posterior branchial region, 

 near the lateral border. The rostrum is acuminate and carinated superiorly, with its 

 lateral margins minutely serrated towards the apex, and a slight concavity, into which 

 the eye-stalk fits, exists on either side near the base. The lateral border of the carapace 

 is provided with a spine at the antero-lateral angle, and a second of smaller size is placed 

 behind the prominent cervical groove ; the posterior margin is armed with two spinules. 

 The eyes are ovate, and almost immobile, while each peduncle terminates in a very minute 

 spinule. The merus of the external maxillipedes is short and broad, with three spines on 

 its inner margin, which decrease in size towards the distal end. The chelipedes are slender 

 and elongated, with the joints slightly granulated, and several sj^ines are present on the 

 inner surface of the merus and carpus, while the inner border of the propodus is provided 

 with a row of short spinules ; the fingers are not equal in length to the palm. The 

 ambulatory limbs are granulated, and the margins of the meri and carpi are fringed 

 with short spinules ; the dactyli are strongly curved, and their edges are entire. The 

 second, third, and fourth abdominal segments are transversely carinated, and provided 

 with curved spines, of which three are present on the second segment, four on the third 

 (arranged in two rows), and one on the fourth. 



This species was taken by the " Blake," off Dominica, at a depth of 333 fathoms. 



Munidopsis sigsbei (A. Milne-Edwards) (PL XVIII. fig. 2). 



Galathodes sigsbei, A. Milne-Edwards, Bull. Mus. Conip. Zocil., vol. viii. No. 1, p. 56, 1880. 



Habitat. — Station 23, off Sombrero, AVest Indies ; depth, 450 fathoms ; bottom, 

 Pteropod ooze. A female with ova, measuring as follows : — Breadth of carapace 9 '8 mm., 

 length of body 86 mm., of carapace (including rostrum) 20 mm., of chelipede 51 mm., of 

 first ambulatory leg 25 mm., diameter of ova 1"5 mm. 



The carapace is unarmed and comparatively smooth, the surface being merely crossed 

 by short indistinct striae. The gastric area is moderately convex, and the cardiac area is 

 triangular in outline, the two being separated by a rather wide space. The rostrum is 

 narrow, acute, and horizontal, its length being about half that of the carapace, and the 

 upper surface is faintly carinated. The lateral borders of the carapace are parallel and 

 unarmed, with the exception of a small spine at the antero-lateral angle. The posterior 

 margin bears five or six spinules (three according to Milne-Edwards) situated close 



^ According to Professor Milne-Edwards, " La region gastrique porte trois petites Opines dispos(5es transversalement, 

 I'une sur la ligne mediane, les autres lateralement." I can find no trace of this median spine in the Challenger specimens. 



