SCALIBREGMA. 33 



De Quatrefages (1865) was uncertain about the position of this family, though he 

 placed it after the Arenicolidae, yet he made a new genus for the Eumenia of OErsted. 



Cams (1885) places the Scalibregmidse after the Opheliidae. 



The Scalibregmidse were ranged by Levinsen 1 (1893) along with the Telethusae under 

 the Arenicolina, an arrangement which meets with no objection, though there are obvious 

 differences. He commences with Eumenia, the only other genus mentioned being 

 Scalibregma. 



De St. Joseph (1894) divided the family into two groups, viz. those with and those 

 without branchiae. Those with branchia3 included the two genera Scalibregma and 

 Eumenia, whilst those devoid of branchiae were Sclerocheilus, Grube, and Lipobranchius, 

 Cunningham and Ramage. 



Benham (1896) grouped the Scalibregmidse under his Nereidiformia, in the fifth 

 sub-order Scoleciformia, and close to the Arenicolidae. 



Ashworth (1904) gives a good classification of the family, distinguishing the main 

 groups, I and II, thus : I. Head with anterolateral tentacles. Body swollen anteriorly, 

 feet, after the fifteenth, prominent, with a laminate dorsal and ventral cirrus, and with 

 gills on the anterior segments {Scalibregma), or none (Pseiido-scalibregma). In a sub- 

 section (B) the simple rounded feet do not form laminate appendages, and the ventral 

 cirri, if present, are confined to the posterior region. Strong curved bristles on the first 

 bristled segment (Schlerocheilus and Asclerocheilus) . II. In this group the head has a 

 median groove ; no tentacles. Body maggot-shaped. Feet represented by dorsal and 

 ventral papillae. No anal cirri. Grills on the anterior segments present or absent {Eumenia 

 and Lipobranchius). The family is allied to the Opheliidae and Arenicolidae (Telethusae). 

 The author states that the nerve-cord lies in contact with the epidermis and outside the 

 circular muscular coat. He does not include Travisia in the group. 



Genus LXXXVI. — Scalibeegma, H. Bathlce, 1843. 



Head somewhat T-shaped, the anterior angles bearing tentacles and the posterior 

 the nuchal organs. Body swollen anteriorly, tapered posteriorly, arenicoliform. Four or 

 five pairs of gills anteriorly. Feet from the fifteenth project prominently, with a dorsal 

 and ventral cirrus or lamella, and setigerous processes. Sense-organ between the dorsal 

 and ventral divisions of the foot. The segmental organs consist of a funnel, a fine 

 straight tube from it to the loop formed by a U-shaped tube, one of the limbs leading to 

 the terminal duct which opens just below and slightly anterior to the base of the ventral 

 division of the foot (Ashworth 2 ). These organs are numerous. 



This genus was one of H. Rathke's important additions to the Norwegian fauna 

 (1843), and he truly pointed out its relations to Arenicola. His figures were as good as 

 his description. 



The genus Scalibregma followed Eumenia under the Opheliacea of Grube (1851) as 

 one of the Limivora. 



1 < Viclensk. Meadel. Foren. Kjobenh./ 1883, p. 180. 



2 ' Quart. Journ. Micr. Sci./ vol. xlv, n.s., p. 282. 



128 



