DASYBRANCHUS. 285 



in a rectum and anus with two papilla. There are at least ten bristled segments. The 

 cephalic ganglia are well developed, but no blood-vessel is visible. A few yellowish 

 pigment-granules occur along the lateral region throughout the greater part of the body. 



Cunningham and Ramage (1888) note that there are several segmental organs in 

 each of the segments behind the genital opening. The ganglion of the ninth setigerous 

 segment is continuous with the ventral epidermis. In front of that point both cord and 

 ganglia are internal to the longitudinal ventral muscles, whereas behind it they are 

 external to the circular muscles and in contact with the epidermis. 



Michel 1 (1898) describes two buds, one short and one long, from the anterior end of a 

 fragment. 



Leschke 2 (1902) mentions a pelagic (telotroch) larva of Oapitella capitata from the 

 Bay of Kiel which somewhat approaches that from St. Andrews, and which had yolk- 

 globules in the centre, and. fourteen segments. He states that the pigment is greenish, 

 whereas in the foregoing it was purplish. 



Gravier (1912), in his finely illustrated treatise on the Poly onsets of the Second 

 French Expedition to the Antarctic, gives a table of the genera of this group. Oapitella, 

 which only has a copulatory apparatus in the male, has less than twelve anterior 

 segments. Moreover, segments one to six have winged bristles, the seventh winged 

 bristles and hooks, segments eight to nine hooks. The copulatory apparatus is included 

 in the integument. 



Genus CXIII. — Dasybranohus, Grube, 1846. Dasymallus, Grube. 



Capitellidae, in which the anterior region has fourteen bristled segments and 

 the posterior region has dorsal and ventral rows of hooks. Head either small and 

 bluntly conical, or relatively large and shovel-shaped. Byes in specks or bands. Peri- 

 stomial segment about as long as the next or a little longer. Proboscis with irregularly 

 rounded or globular papillae. Body long, cylindrical. Segments of anterior region two- 

 ringed, the last two having the character of the posterior region. Segments of posterior 

 region two-ringed and longer than those of the anterior. The ventral longitudinal 

 muscle is less than in Notomastus. Ventral tori not so much dorsal in position as in 

 Notomastus. Bristles relatively long ; capillary in front. Hooks with two swellings of 

 the shaft. Branchiae on the posterior segments inferior, simple, or branched, retractile. 

 Ciliated organ between the head and the peristomial segment (in relation to the cephalic 

 ganglia). Lateral organs in all the bristle-bearing body-segments. Cup-organs in the 

 proboscis, on the head, and the anterior region. Segmental organs begin on last anterior 

 segment and continue throughout most of the posterior region. Ovary absent anteriorly. 

 Genital apertures from the last anterior segment to the fortieth or sixtieth posteriorly. 



This genus was founded by Grube, one of the veteran investigators of the group, in 

 1846, 3 under the title of Dasymallus, but this he afterwards (1851) changed to Dasy- 

 branchus. In his original description he thought it approached the Arenicolidae, but 



1 'Bull. sc. de Fr. et Belg./ t. xxxi, 4 e ser., p. 245. 



2 'Wissenscli. Meeresuntersuch./ 5 Bd., p. 123, Taf. vi, figs. 11 and 12. 



3 ' Arcliiv fur Naturges./ p. 166, pi. v, figs. 3 and 4. 



