18 AMMOTRYPANE CYLINDRICAUDATUS. 



rush about in every direction through water or sand, mucus or mud, and then generally 

 plunge into sand. It has never been encountered at low water, so that its home would 

 appear to be the laminarian region and deeper water. 



Dr. G. Johnston (1865) mentioned the occurrence of black specks behind the snout 

 in some specimens, but he was uncertain whether they were eyes. Such have not been 

 observed. 



Ammotryjpane gracile, procured by the ' Challenger' 1 near Japan, is a closely allied form. 



Wiren (1887) included this species in his careful account of the anatomy of the 

 limivorous polycheets. He gives a figure of a transverse section through the middle of 

 the body which, however, has the ventral longitudinal muscles as simple rounded bands. 



Cunningham and Ramage (1888) point out that the first setigerous segment bears 

 no branchia, that the spear-shaped anal extremity has cirri round its posterior edge, and 

 a long cirrus between the two small fusiform appendages in front of the vent. They 

 figure a species of Opalina from the intestine. 



2. Ammoteypane oylindrioaudatus Hansen, 1879. Plate XCV, figs. 4 and 4 a— body and 



tail; Plate CIII, figs. 14 and 14 a. 



Specific Characters. — Head an acute cone, ending in a slender process with a clavate 

 tip. Ventral longitudinal muscles pass forward almost to the extremity of the snout. 

 Mouth a short distance behind the latter. Body very slender, with numerous branchial 

 cirri, which are specially 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 or grooves, and with an uneven posterior margin. Bristles short, 

 simple, and tapering. 



Synonyms. 



1879. Ammotrypane cylindricaudatus, Hansen. Nyt Mag. f. Naturvid., Bd. xxiv, p. 4, Taf. vi, f. 1 — 8. 



1882. „ „ idem. Norske Nord. Exped., vii, p. 36, Tab. vi, figs. 20—28. 



1883. „ „ Levinsen. Vidensk. Meddel. Foren. Kjobenh., p. 118. 

 1883. „ cylindricaudata, Wiren. Chaetop " Vega" Exped., p. 406. 



1886. „ cylindricaudatus, Levinsen. Kara-Havets, p. 9. 



1894. „ „ Bidenkap. Christ. Vid.-Selsk. Forhandl., p. 101. 



1897. „ „ Michaelsen. Polych. deutsch. Meere, p. 134. 



1908. „ „ Mcintosh. Ann. Nat. Hist., ser. 8, vol. i, pp. 384, 385, and 387. 



1909. „ „ Fauvel. Bull. Inst. Ocean., 142, p. 8. 



Habitat— Dredged in the < Porcupine ' Expedition of 1870, at 740 fathoms, at Station 

 No. 17 a. 32° 31' N. Lat, and 9° 39 W. Longit. Bottom temperature, 49'3°. 



St. Lawrence, Canada, 1872 (Whiteaves). 



Norway, various stations, Dr. Merle Norman in 1879. Siberian Seas and Behring's 

 Sea. Kara-Havets (Levinsen). Spitzbergen (Fauvel). N. Atlantic (Hansen). Finmark 

 (A. M. Norman), large. 



Head (Plate XCV, fig. 4) forming an acute cone terminated by a slender process 

 1 f Report on the Annelida/ p. 357, pi. xlii, figs. 9—12, 1885, 



