346 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



tenure of these genera,* I prefer to refer it provisionally to Heller's 

 genus PolychelesA It is apparently very distinct from any of the At- 

 lautic species described by Heller, Willemoes-Suhm, | or Bate, but, 

 judging from the very short descriptions gi^ en by the last author, it 

 appears to be very closely allied to his Pentacheles auriculatus obtained 

 by the Challenger Expedition off the Fiji Islands. In fact I am not 

 able to point out any characters by which the two forms could be dis- 

 tinguished, but, in view of their wide geograi)hical separation, I take it 

 for granted that they are distinct species, and that it would be easy to 

 point out specific characters were Bate's species fully characterized. 



Polyclieles sculptus, sy. nov. 



Male. — The sides of the carapax are nearly parallel posteriorly, but 

 arcuately convergent anteriorly, and the greatest breadth is just in 

 front of the cervical suture, and is about three-fourths of the length 

 along the median line. As seen from above, the anterior margin is con- 

 cave in outline, so that the lateral angles, which are acute and spiniform, 

 are much in advance of the rostrum, which is armed with two spines 

 close together and projecting obliquely upward and forward. About a 

 third of the space between the median line and the lateral angle each 

 side is occupied by a very deep orbital sinus nearly parallel with the 

 lateral margin, considerably deeper than broad, somewhat narrowed and 

 evenly rounded posteriorly, and completely filled by a large ophthalmic 

 lobe (figure 1, c). On the inner side of this sinus the frontal margin pro- 

 jects in a small spiniform tooth, but outside, the margin is unarmed and 

 curves regularly to the lateral angle. Just behind the orbital sinus there 

 is a smooth and evenly curved depression in the surface of the carapax 

 exposing a small area on the posterior part of the ophthalmic lobe, more 

 fully described beyond. The cervical suture divides the dorsal surface 

 of the carapax into two pretty nearly equal portions, and is deep and 

 conspicuous, but is indicated in the lateral margin, each side, by a slight 

 emargination only, which is scarcely deeper than the emargination be- 

 tween the anterior and posterior lobes of the hepatic region. The 

 lateral margin is armed, on the anterior lobe of the hepatic region, with 

 (including the anterior angle) six small and slender spinifom teeth di- 

 rected forward, and on the posterior lobe with three more. The lateral 

 margin, behind the cervical suture, is armed with seven similar teeth 



* Norman. — "On the Willemoe&ia Group of Crustacea." <^Anuals and Magazine 

 Nat. Hist., V, ii, pp. 382-885, 1878. 



Bate. — On the Willemoesia Group of Crustacea. <^ Annals and Magazine Nat. 

 Hist., V, ii, pp. 484-489, 1878. 



Norman. — Remarks on recent Eryontidse. <[ Annals and Magazine Nat. Hist., V, 

 iv, pp. 173-182, 1879. 



tBeitrage znr nabereu Kenntniss der Macrouren. <■ Sitzungsberichte Akad. der 

 Wissenschaften, Wien, matli.-nat. Clrtsse, xlv, Abtli. i, pp. 389-393, pi. 1, i3gs. 1-6, 1862. 



Die Crnstaceen des siidlicheu Euiopa, pp. 209-212, pi. 7, figs. 1,2, 1863. 



t On some Atlantic Crustacea from the Challenger Expedition. <[ Trans. Liimoan 

 Soc. London, II. i, pp. r)0-56, pis. 12, 13, 1875. 



