CIRRATULUS CHIAJIL 247 



November. Elwes (1910) observes that the young, 40 mm. long, appear to live in crevices 

 in rocks. 



Claparede and Mecznikow 1 describe a young Cirratulid, it may be pertaining to 

 C. chrysoderma. It was obtained in May, and had about six segments, a pair of eyes on 

 its conical snout, a mouth, pharynx and intestine, lateral cirri, a dorsal and two lateral 

 blood-vessels. In the body-cavity were two enigmatical bodies which the authors thought 

 might be ova of a parasitic crustacean. 



Montagu (1808) found his example in a piece of timber perforated by boring 

 molluscs, and it was 8 or 9 inches in length. 



Claparede distinguishes (in 0. chrysoderma) between tentacles and branchiae in such 

 forms by the fact that the former (tentacles) have only one blood-vessel, whilst the latter 

 have two. 2 The single vessel in the tentacle terminates in a blind extremity ; moreover, 

 the walls of the tentacles are thick with rhythmical contractions which drive the blood to 

 and fro in the single vessel. In Audouinia filigera, on the contrary, every filament is 

 branchial in structure. 



The segmental organs in this species occur in the second segment, and in Audouinia 

 filigera they are met with in the first. The blood is charged with fusiform flattened 

 corpuscles, which Claparede says do not enter the lateral branchia3. 



Cunningham and Ramage (1888) describe the lateral branchial filaments as arising 

 immediately above the base of the dorsal division of the foot. 



Brasil 3 (1904) describes the occurrence of a sporozoon, Angeiocystis Audouinise, in the 

 cardiac body of this form, and he followed it through the various phases of macrogametes, 

 microgametocytes, microgametes, ookysts, sporozoites, and schizonts. 



Grravier 4 (1906) retains the main characters of the family as given by Grube, De 

 Quatrefages, and others, and also conserves the genus Audouinia of De Quatrefages for a 

 new species from the Red Sea. 



2. Cirratulus Chiajii. Plate XCIV, fig. 18— foot; Plate CVII, fig. 3— hook. 



Specific Characters. — Head a short cone. Body 2 — 3 inches long, more slender 

 and delicate than in G. tentaculatus, but of similar shape, the anus being dorsal with a short 

 cone beneath. Immediately behind and rather above the first bristled foot is a branchia, 

 and so with the three following. On the dorsal line between the fourth and fifth bristle- 

 tufts is a group of four or five slender branchige. The branchige occur singly on each side 

 behind the foregoing, and are sparsely distributed along the posterior region almost to the 

 tail. The crotchets appear in the ventral division about the twentieth foot, whilst they 

 occur in the dorsal division about the fortieth foot. The crotchets have their curves some- 

 what more pronounced than in G. tentaculatws, and posteriorly the ventral are consider- 

 ably larger and stronger than the dorsal. 



1 ' Zeitschr. f. wiss. Zool./ Bd. xix, p. 192, Taf. xiv, fig. 4, 1868. 



2 Williams was thus correct in regard to the double vessel in " (7. Lain archil," 



3 < Compt. Rend. Acad. Sci./ Paris, t. 139, p. 645. 



4 ' Nouvelles Arch. Mus./ 4 e ser., t. viii, p. 150. 



