384 VroL M'lutosh' a Notes from ike 



surface is convex, the ventral concave. The body is closely 

 ring^ed from the base of the prostomium to the caudal process, 

 and the anterior dorsal surface is tessellated as in Scalibregma, 

 but the ventral surface is smooth. At first sight feet appear 

 to be absent, but closer inspection shows a pair of minute 

 papillae on every third ring. No bristles were present. 



Another species, apparently very near the Ammotrypane 

 cylindricaudatus of Hansen *, from the '* Norske Nordhavs- 

 expedition i 1876," has an acutely conical head ending in a 

 slender process with a clavate tip, as in A. gracilis of the 

 ' Challenger ' t, and thus agreeing with ffirsted's genus 

 Ophelina. The ventral longitudinal muscles pass almost to 

 the extremity of the snout. Mouth a short distance behind 

 the latter. The body is very slender, with numerous 

 branchial cirri, which are conspicuous posteriorly, as also are 

 four setigerous processes in front of the caudal appendix, 

 which is cylindrical or somewhat clavate, transversely marked 

 by minute ribs, as also in the Ammotrypane delajndans of 

 Kinberg \, first procured at Valparaiso, and aiterwards 

 described by Ehlers § from various parts of Chili, and with 

 an uneven posterior margin — that is to say, the dorsal edge 

 forms a prominent papilla, the ventral being less, whilst an 

 elevation occurs between them. In the majority the process 

 is gradually narrowed to its base, so that it is really some- 

 what clavate. The bristles are short, simple, and tapering. 

 This form ranges from Station 17 o, at 795 fathoms, in the 

 'Porcupine' Expedition of 1870 to Norway and Canada. 

 Hansen's description and figures leave some doubt as to the 

 actual identity, but such may be partly due to the larger size 

 and more perfect condition of his specimens. Thus he 

 describes and figures the head as similar to that of Ammo- 

 trypane auloyaster, H. R., whereas in this it forms an acute 

 cone ending in a slender process with a clavate tip. The 

 caudal process in both is similar in general outline, and so 

 with the four lateral setigerous processes in front of it ; but 

 the processes on the posterior margin differ in the small 

 examples from the ' Porcupine,' it may be from friction or 

 other injury. Moreover, the organ appears to be readily 

 reproduced. On the whole, the two forms seem to be identical. 

 The Armandia weissenhornii of Kiikenthal ||, from Perim, is 



* Nyt Mag. f. Ncaturvid. Bd. xxiv. p. 8, Taf. vi. figs. 1-8. 



t Annel. ' Challenger,' p. 357, pi. xliii. figs. 9, 12. 



X bfvere. K. Vet.-Akad. Forh. 1865, no. 4, p. 258. 



§ Polychfet. Magell. u. chil. Strandes, 1901, p. 173, Taf. xxii. fig. 9. 



II Jenaische Zeitsch. Bd. xxi. K. F. xiv. p. 366, Taf. xxi. fig. 6. 



