REPORT ON THE CRUSTACEA MACRTJRA. 127 



recorded from the West Indies, the Fiji and the Celebes Islands, at depths varying from 

 220 to 1070 fathoms. 



The Eev. Dr. Norman, 1 says that the females of Polycheles typhlops are character- 

 ised by the posterior pair of pereiopoda terminating in small and feeble but perfect 

 chelte, simdar to those that exist in Arctus, Ibaccus, and most species of Palinuridse. 

 This is also the case in Polycheles baccata, but it does not appear to be persistent in 

 every species, as may be seen in Polycheles helleri. 



Polycheles crucifera (Willemoes-Suhm) (PI. XIII.). 



Wilhmcesia crucifera, Willeinoes-Suhm,. Trans. Linn. Soc. Lond., ser. 2, vol. i. p. 52, pi. xii. 



fig. 11; pi. xii. figs. 10, 11. 

 Willemcesia crucifera, Sp. B., Ann. and Mag. Nat. Hist., October 1878, p. 277. 



Carapace ovate, lateral margins fringed with large teeth ; frontal margin armed with 

 a single rostriform tooth, and two sharp teeth on the inner angle of the orbital notch ; 

 dorsal median ridge without teeth, but minutely nodulated, as also is the dorsal surface, 

 where lines of nodules correspond with the limits of the calcareous formation of the 

 pereion. Pleon 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 dorsal surface 

 of the carapace, and projects beneath the antero-lateral angle of the carapace, in the 

 form of an obtuse point. 



Length, 45 mm. (l - 5 in.). 



Habitat. — Station 23, off Sombrero Island, West Indies, March 15, 1873; lat. 

 18° 24' N.,long. 63° 28' W.; depth, 450 fathoms; bottom, Pteropod ooze. 



The dorsal surface of the carapace is marked with a cruciform line formed by a 

 nodulated ridge that traverses the median line from the anterior to the posterior margin, 

 and a transverse ridge along the posterior margin of the cervical furrow. Another 

 nodular ridge on each side leads from the posterior extremity of the orbital notch to the 

 cervical furrow, and another diagonally towards the lateral margins. Posterior to the 

 cervical furrow the nodules are larger and more isolated ; a row of these nodules, separated 

 from each other, traverses the line of the internal margin of the branchial region, the 

 others are more generally scattered, and the entire surface between the nodules is covered 

 with a number of minute, rather stiff, curved hairs. The anterior division is a little 

 narrower than the posterior, and is again, particularly at the margin, divided into two 

 portions, each of which is armed with a series of long, slender, spinous teeth. 



The rostral tooth in the median line of the anterior margin, instead of being 

 horizontal, is nearly perpendicular to the dorsal surface, and is long and slender ; on the 



1 Ann. and Mag. Nat. Hist, ser. 5, vol. iv. p. 177, 1879. 



