Willemoesia Group of Crustacea. 277 



ated in the anterior or frontal surface of the ceplialon, and 

 neither lodged in a notch in the dorsal surface of the carapace 

 nor covered by the antero-lateral wing of the carapace. Eyes 

 small, directed outwards and forwards. 



Of the genus Polyclieles there are three species in the collec- 

 tion of the ' Cliallenger ' expedition ; and of these I take as the 

 type of the group the specimen that has been named by 

 Willemoes-Suhm W. crucifera. It agrees with Heller's 

 figure in having but a single rostriforra tooth, but differs from 

 it in general form • but it stands, according to its general 

 structm'c, at the opposite extremity of a series of intermediate 

 forms to Willemoesia leptodactyla. 



Polyclieles crucifer (Willemoes-Suhm). 



Willemoesia crucifera, Willemoes-Subm, Linn. Trans, vol. i. 2ncl series, 

 p. 52, pi. xii. fig-. 10, pi. xiii. figs. 10, 11. 



Carapace ovate, margins fringed with large teeth ; frontal 

 margin armed with a single rostriform tooth and two sharp 

 smaller teeth at the inner angle of the orbital notch ; dorsal 

 ridge without teeth, but nodulated, as well as the dorsal sur- 

 face, where the nodules run in lines corresponding with the 

 limits of the internal osseous formation. Picon with a spinous 

 carina traversing the median line, each somite being armed 

 with two strong teeth. The eye is lodged in a narrow cleft of 

 the carapace, and projected beneath the antero-lateral wing in 

 the form of a long obtuse point. 



This species was taken in the West Indies, off Sombrero 

 Island, at a depth of 450 fathoms, on a bottom of Olohigerina- 

 ooze. Length 1^ inch. 



Polycheles Helleri^ n. sp. 



Lateral margins of the carapace subparallel ; anterior divi- 

 sion armed with seven teeth, median with four, and posterior 

 with many, decreasing in size posteriorly ; dorsal central ridge 

 armed with two rostral teeth, two median, and two on the pos- 

 terior margin, with a few intermediate. The pleon is carinated 

 on the five anterior somites, the anterior median portion of each 

 somite culminating in an anteriorly directed point. Eye 

 lodged in a deep notch, with the inner and outer canthus 

 smooth. Meros of the first pair of pereiopoda armed on the 

 outer side with two teeth, and on the inner with one or two 

 smaller ones. 



This species was first taken in lat. 29° 55' S., long. 178° 14' 

 W., near Kcrmadec Island, three or four degrees north of 



