382 CH^ETOPODA. 



Uir processes, usually with small eyes. The oral segment mostly with two iong 

 tentacular cirri, which are usually grooved. Cirriform branchiae are present. 

 Pol i/iJurii initfiitnitii Clap., Naples. Sp-lo gcticornix Fabr., north seas. 



Fam. Chaetopteridse. Body elongated and separated into several dissimilar 

 regions. Usually two or four very long tentacular cirri. Dorsal appendages 

 of the middle segments have the shape of wings and are often lobed. They 

 live in parchment-like tubes. Telcj>x,n-ttx Cost urn HI- Clap., Naples. CJia-t^tcnis 

 pergameiitaceus Cuv.. West Indies. 



Fam. Terebellidae. Body vermiform and thicker anteriorly. The thinner 

 posterior portion is sometimes distinctly marked off as an appendage destitute 

 of sette. The prsestomium is indistinctly separate from the mouth segment. 

 There is frequently a lip above the mouth. Numerous filiform tentacles, usually 

 arranged in two tufts. There are pectinate or branched, rarely filamentous, 

 gills on a few of the anterior segments. Dorsal prominences (uotopodia) fur- 

 nished with simple setse, and ventral transverse ridges (neuropodia) with hooked 

 sets. TerrltcUu. conchiler/a- Pall., English coast, Mediterranean. A martin ivtr 

 GruljL'l Malmgr., Greenland and Spitzbergen. Pectinnriii- aitricoma, 0. Fr. 

 Mull., North Seas, Mediterranean. ^ulicUaria (IL-riiii'lla') spinulosa R. Lkt., 

 Heligoland. 



Fam. Serpulidae. Body usually distinctly divided into two regions (thorax, 

 abdomen). Prrestomium fused with the mouth segment, which as a rule is pro- 

 vided with a collar. The mouth is situated between two semicircular or spirally 

 coiled plates, from the anterior margin of which spring the branchial filaments. 

 These have secondary filaments arranged in single or double rows, and may be 

 supported by a cartilaginous skeleton, and have their bases connected by a 

 membrane. SpirogrtVplvis Spallanzaiui, Naples. Sabella penieillus Lin., North 

 Seas. <s'. Kolliltcri Clap., Mediterranean. Protuhi lindolj>lii Risso, Mediterra- 

 nean. Fllii/rana Implexa Berk., Norwegian and English coasts. Serpula noi 1 - 

 cegicu- Gunn.. North Sea and Mediterranean. Sjjinirhtx spirillum Lin., Ocean. 



Order 2. OLIGOCH.ETA.* 



Hermaphrodite Choetopoda without pliaryngeal armature and para- 

 podia. There are no tentacles, cirri, or branchice. The development 

 is direct. 



The cephalic region is composed of the prsestomium, which projects 

 as an upper lip, and the mouth segment. It does not essentially 

 differ from the following segments so as to form a special region (tig. 

 309). Tentacles, palps, and tentacular cirri are never found on it, 

 but tactile papilla? are present in great number, as are also peculiar 

 sense organs which resemble taste buds. Eyes either fail or are 

 present as simple pigment spots. Besides the small gland cells of the 



* Besides tin.- works of W. Hoffmeister. D'lJdekem. and others, compare : 

 E. Claparede, " Recherches anatomiques sur les Annelides, etc., observes dans 

 les Hebrides," Geneve, 1860. E. Claparede, "Recherches anatomiques sur les 

 Oligochastes," Geneve, 1862. A. Kowalevski. " Embryo] ogische Studien an 

 Wiirmern uud Arthropoden (Luml-ii-u*, EuiLirtT)." 1 'Petersburg, 1S(>1. I>. 

 Hatschek. Studien liber Entwickhmgsgeschichte der Anneliden." Wien, 

 1878. Fr. Vejdovsky, " Beitrage zur vergleichenden Morphologic der Anneliden. 

 I. Monographic der Enchytrasiden," 1879. 



