CIRRATULUS. 209 



specimen of Sj). jjeripatus there were about (50 segments, in lengtli 

 about equal to their own diameter ; whereas Oersted states that in 

 Sp.Jlavmn there are 150 segments, twice as broad as long. The 

 other differences are comparatively trifling. 



Plate XIV. Fig. 1. Spheerodorum peripatus of the natural size. 2. The 

 same highly magnified. 3. The anterior portion of the body from 

 below, to show the position of the mouth and proboscis. 4. A few 

 segments from near the middle of the body. 5. A single foot and 

 branchiae to show their structure. 6. Three of the branchial globes 

 separate from the feet. 



28. CIRRATULUS*. 



Cu-ratulus, Lam. Anim. s. Vert. v. 300. Aud. ^- M.-Edw. Litt. de la 

 France, ii. 268. Blainv. Diet. cit. Ivii. 489. Johnston in Mag. 

 Zool. 4" Bot. ii. 71 • Oersted, Annul. Dan. Consp. 43. Grube, 

 Fam. Annel. 67. 



Char. Body vermiform, subcylindrical, the segments narrow and 

 numerous : head conical, labriform : mouth inferior, with a very 

 short proboscis : branchiae in the form of long filiform tortuous fila- 

 ments originating from the dorsal aspect, or from the margins, of the 

 segments, the few first segments without any, the segment succeed- 

 ing the abranchial having a transverse series of many crowded on 

 the suture : feet small, forming a double series along each side : 

 bristles of two kinds, setaceous : anus dorsad, terminal, simple. 



1 . C. tentaculatus, branchial filaments originating from the anterior 

 margin of the seventh segment ; the body filaments nximerous 

 throughout. Length 8-9". 



Terebella tentaculata, Montagu in Linn. Trans, ix. 1 10. pi. G. f. 2, 



copied in Encyclop. Brit. xi. pi. 276. f. 4. Penn. Brit. Zool, edit. 



1812, iv. 111. 

 Cirvhatulus Lamarckii, Aud. ^- M.-Edw. Litt. de la France, ii. 271. 



pi. 7. f 1-4. Williams, Rep. Brit. Assoc. 1851, 200. 216 & 236. 

 Cirrhatula tentaculata, Templeton in Loud. Mag. Nat. Hist. ix. 234. 

 Cirrhatulus tentaculatus, Fleming in Encycloj). Brit. xi. 221 ; Mag. 



Zool. cy Bot. ii. 73. 



Hab. The littoral region. 



Obs. Considerably larger than the following. The snout is marked 

 across with a dusky line. From the coalition of the anterior seg- 

 ments it is difficult, in preserved specimens, to decide which one is 

 the first branchial. Grube omits this character, to which Audouin 

 and M. -Edwards appear to attach much importance. It must be 

 remembered that lateral or scattered filaments are found on some 

 segments anterior to the seventh. 



* Cirratulus, formed from cirratus, curled. 



