328 PEECT SLADEN TEUST EXPEDITION. 



Locality. Mauritius, A 2, 100 fathoms. A single specimea with Lejjidoiiotus cristatus 

 var. echinata " taken out of a hole in a sponge." 



This worm differs in general appearance from Falmyra aurea in the arrangement of 

 the palese, which leave the middle of the back bare, and in the fact that these structures 

 are smooth and not serrate. The skin is remarkable for its silvery lustre, and dorsally 

 it is covered with little globular papillae which give it a rough granular appearance. It 

 is curious that, in spite of the alternating distribution of the dorsal cirri, there is no trace 

 of eljtral structures, for though the elytra might very possibly have been lost, it is hard 

 to account for the absence of any structures which can be construed as elytrophores. 

 In the British Museum specimen of P. aurifera referred to on p. 325 the elytra do not 

 appear to be at all easily detachable. 



Genus BHAWANIA. 



3. Bhawania cryptocephala, Gravier. 

 Gravier, Nouv. Arch.Mus. Hist. Nat. stir. 4, vol. iii. 1901, p. 263. 



Two fragments, which appear to belong to this worm, come from Zanzibar. They 

 presumably belong to the same individual and make up a length of 40 mm. ; but as the 

 worm is still incomplete, it would jjerhaps be much longer than Gravier's complete 

 specimen measuring 35 mm. The width is 3 mm. 



The body is flattened and the dorsal surface is convex with a median keel. Neither 

 head nor tail is preserved. Gravier was unable to make out the prestomium or its 

 appendages, and only located the anterior end by its attenuation. Schmarda, who first 

 described this genus*, found a prestomium with five pairs of appendages. 



The identity of this worm with the Red Sea species is concluded from the likeness of 

 the parapodia and the setaj to the types figured by Gravier. '^\\e palece have the same 

 peculiar shape and ornamentation composed of fine transverse striae intersected by 

 longitudinal ridges, whicli on the internal border and on a single ridge on the posterior 

 face give rise to a series of denticulatious (the external border being smooth). One 

 ieature which Gravier does not mention is the occurrence of small irregular spines on 

 the tip of the palea, which are largest just on the anterior border. 



Gravier describes only two types of ventral setae, while the specimen before me has 

 three distinct types of articulate setae. A typical segment possesses the following 

 succession : — 



(1) Appendix long, hair-like and tapering, the edge provided with long teeth. About 

 4 in number. 



(2) Appendix short and stout, apex incurved. Teeth long (about 7) and distinct in the 

 upper examples, but passing ventralM'ards the teeth are first reduced to tiny serrations, 

 and finally in the lower ones disappear, leaving a perfectly smooth edge. This type is 

 very numerous. 



(3) Small, very slender setae with long hair-like appendix, but always with a smooth 

 edge. 



Locality. Zanzibar, 1 specimen (female with eggs); collected by Mr. C. Crossland. 

 * Neue wirbellose Thiere (Leipzig, 1861), p. 164 {Bhawania myriahpis). 



