170 Canon A. M. Norman on a 
usual in species of the genus ; last joint furnished with a few 
sete at the extremity. 
Antenne with the last joint of the peduncle much longer 
than the penultimate, much constricted at the base. 
First feet with the fourth joints very small. There are 
five spines on the third joint, one on the fourth joint, and 
four on the hand. 
The last legs are wholly devoid of spines on the face of the 
limb; the ends of the joints are truncate, the third not at all 
produced downwards behind. 
The telson is broader than long, very widely and evenly 
rounded at the extremity, and furnished with about sixteen 
serrulations of equal size, alternating with sete. Uropods 
longer than the telson and reaching to some distance beyond 
its extremity ; both inner and outer branches bear two small 
distal spmes, buried among the fringing sete. 
The broad telson, with its widely rounded and distally 
serrulated extremity and absence of spines or of lateral serru- 
lations larger than the others, at once distinguishes this species 
from its allies. ‘The forms nearest to it are EL. pulchra and 
Li. inermis; but in the former the extremity is not nearly so 
wide and two pairs of spines are present among the serrula- 
tions, while in the latter the extremity is not equally rounded, 
the outermost serree are somewhat larger than the others, and 
the uropods are distinctly shorter than the telson. The 
specimen is a female. 
The type here described was dredged by the ‘ Porcupine’ 
in 1869, but unfortunately no number of the dredging is with 
the specimen, and therefore the nearest approach which can 
be given as the habitat is Hastern North Atlantic. 
EXPLANATION OF THE PLATES. 
PLATE V. 
ig. 1. Heterotanas Gurneyt, sp. n., 2, dorsal view. 
Fig. 2. x Cheliped, 9. 
Fig. 3. _ in Chela of cheliped, 2. 
Fig. 4. 7 Second leg, 2. 
Fug. 5. 99 55 Antennule, ¢. 
Fig. 6. 5 % Cheliped, ¢, inner face. 
Fig. 7. - > = », outer face. 
PuaTE VI. 
Fig. 1. Heterotanais Gurneyi, sp.n. Uropod, 3. 
Fig. 2. Heterotanais Orstedi, Kroyer. Cheliped, ¢, inner face. After 
F, Miller. 
