THE ANATOMY OF SCALIBREGMA INFLATUM. 293 



scribed genera.^ Its prostomium is drawn out into two well- 

 marked tentacular processes, but its skin appears to be 

 smooth, and (in the figures) bears no signs of secondary 

 annulation, and the parapodia do not project prominently 

 from the body. The posterior end of the animal forms a thin 

 tail, upon the end of which the anus opens. It is distin- 

 guished from Eumenia and Lipobranchius by its prosto- 

 mium and skin, and from S calibre gma by its parapodia 

 and skin. 



There still remain for consideration two members of the 

 family, viz. Sclerocheilus minutus, Grube, and Lipo- 

 branchius intermedins, S. Joseph. The former was 

 discovered and briefly and somewhat incorrectly described 

 by Grube ^ in 1863, but this description has been revised and 

 extended by S. Joseph (1894, p. 103). The animal is small, 

 only about 5 — 20 ram. long, and is found living in oyster- 

 shells. The head is of moderate size, and bears two blunt 

 tentacular processes. There are eversible nuchal organs at 

 the sides of the prostomium. The parapodia contain capil- 

 lary and furcate set{«, and those of the second segment (the 

 peristomium being achaetous) also contain stout acicular seise 

 which are curved near the tip. Behind the twenty-second 

 segment each parapodium bears a small digitiform cirrus 

 below the neuropodium. This is not a gill, as it contains no 

 vessels ; it is evidently sensory, as indicated by the presence of 

 fine stiff hairs upon it. The skin is sculptured as in Scali- 

 bregma. There are no gills. There are five" (or rarely 

 six) cirri around the anal aperture. The alimentary canal 

 resembles that of the other members of the family except 

 that there are no oesophageal pouches. The brain and nerve- 

 cord agree with those of the other members of the family, 



' Ehlers (1887, p. 170) evidently doubted whether tliis animal should be 

 included in the genus Eumenia, for he says, " Icli stelle diese Art vorliiufig 

 in die Gattung Eumenia." 



- " Beschreibung neuer oder weng bekannter Anneliden, Sechster Beitrag," 

 'Archiv fiir Naturgeschichte,' Jahrg. xxix, Band i, p. 50. Berlin, 1863. 



? Grube describes and figures four anal cirri. 



