54 STALK-EYED CRUSTACEA. 
they are, furthermore, furnished with numerous light-colored sete. The 
opercular face between the lobulated 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 setae, 
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, 5mm.; 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., Cancellus 
canaliculatus (Herbst) * from the East Indies, @. ¢ypus M. Edw.,} habitat un- 
known, and OC. parfaiti A. M. Edw. et Bouv.} from the Cape Verde Islands. 
Compared with C. canaliculatus, C. tanneri is distinguished by its much 
shorter atid 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 antenne. From C. typus 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 coxe of the last pair of legs, too, present a very different 
shape in that they lack the prominent anterior lobe observable in. C. ¢ypus. 
C. parfaiti has not been figured. It is said to agree closely with C. canalicu- 
latus, save that the margins of the opercular facets of the legs are cut into 
quadrangular lobes as in C. tanner?. Judging from Milne Edwards and Bou- 
vier’s diagnosis, it would seem to differ from C. fannert in having longer eye- 
stalks, less pubescence upon thorax and abdomen, and the coxal segments of 
the posterior legs far more protuberant. 
* Cancer canaliculatus Herbst, Naturgeschichte der Krabben und Krebse, Bd. III., Heft IV., p. 22, 
Plate LX. Fig 6, 1804. 
+ Ann. Sci. Nat., Zool., 2° Sér., VI. 286, 287, Plate XIV. Fig. 3, 38a, 1836; Hist. Nat. des Crustacés, 
TI. 243, 1837. 
Bull. Soc. Philomath. de Paris, 8e™e Sér., III. 69, 70, 1891. 
