54 STALK-F.YED CRUSTACEA. 



they are. furthermore, furnished with numerous light-colored setce. The 

 opercular face between the lobiilated margins is granulated. The dactylus 

 is about equal to the propodite in length, and ends in a brown, horny claw. 

 The third pair of appendages is furnished with scattered amber-colored setse, 

 those on the superior margin arising from tubercles or blunt teeth, which are 

 found on the merus, carpus, propodite, and dactylus. The dactylus of these 

 appendages again is equal in length to the propodite, and is tipped with a 

 horny nail or claw. The coxal segment of the last pair of thoracic appen- 

 dages has the anterior border convex, but not produced to form a prominent 

 lobe. 



The calcified parts of the test are white, spotted with red. On the eye- 

 stalks and legs the spots .show a tendency to coalesce in transverse bands. 



Length of carapace, 7 mm. ; breadth of carapace, 5 mm. ; eye-stalk, 3 mm. 



Station 3368. 66 fathoms. 1 male. 



The sole specimen obtained was found within a cavity formed in a piece 

 of dead coral rock. 



Three other species of Cancellus have been described, viz., CanccUus 

 canaliculattis (Herbst) * from the East Indies, C. typus M. Edw.,t habitat un- 

 known, and C. parfaili A. M. Edw. et Bouv. % from the Cape Verde Islands. 

 Compared with C. canalicidatiis, C. tanncri is distinguished by its much 

 shorter and stouter abdomen, by the lobation of the marginal crests of the 

 chelipeds and .second pair of legs, by the pubescence of the thorax and abdo- 

 men, and the shortness of the antennae. From C. ti/pus it differs in having 

 the anterior border of the carapace less deeply incised on either side of the 

 rostrum, and the telson squarely truncated posteriorly and not notched in 

 the middle ; the coxse of the last pair of legs, too, present a very different 

 shape in that they lack the prominent anterior lobe observable in C. fi/pns. 

 C. ])ar/aiii haa not been figured. It is said to agree closely with C canaUcii- 

 laiiis, save that the margins of the opercular facets of the legs are cut into 

 quadrangular lobes as in C. /aiiiieri. Judging from Milne Edwards and Bou- 

 vier's diagnosis, it would seem to differ from C. lanncn in having longer eye- 

 stalks, less pube.scence upon thora.x and abdomen, and the coxal segments of 

 the posterior legs far more protuberant. 



• Cancer canalkulatus Herbst, Naturgescbichte dcr Krabbeii und Krcbse, Bd. III., Heft IV., p. 22, 

 Plate LX. Fig 6, 1804. 



t Ann. Sci. Nat., Zool., 2« Scr., VI. 286, 287, Plate XIV. Fig. 3, 'ia, 1836 ; Hist. Nat. des Crustaces, 

 II. 2i3, 1837. 



X Bull. Soc. Philomath, de Paris, 8*"« Scr., III. 69, 70, 1891. 



