280 



CAPITELLA CAPITATA, 



Notomastus D, ? variety of N. latericeus. 



Dredged off Cape Finisterre in eighty-one fathoms in the < Porcnpine ' Expedition 



1870. r 



A comparatively small form with an acutely-pointed snout of two segments, the 

 terminal in some being almost probe-pointed. No trace of eyes occurs in the prepara- 

 tion. The body in all is incomplete, but it probably attains the length of Capitella 

 capitata, and is about the same thickness. The peristomial segment has the proboscis in 

 some thrust out as a flattened button, with a median depression. Its inner surface is 

 covered with small, bluntly-conical papilla. Twelve of the anterior (thoracic) segments 

 have bristles dorsally and ventrally, each segment being two-ringed. Thereafter dorsal 

 and ventral rows of hooks occur in the usual positions. 



Genus CXIL— Capitella, Blainville, 1828. 



Lumbricus, Olaf sen ; Lumbriconais, (Ersted ; Valla, Johnston. 



Capitellidas with nine segments in the anterior region ; segments one to six with 

 capillary bristles and hooks, and the same in the eighth and ninth. The posterior region 

 has only hooks. Head bluntly conical, snout inferiorly shovel-like. Protrusible ciliated 

 nuchal organs close behind the eyes. Cephalic ganglia bilobed. Peristomial segment 

 without bristles. Cup-shaped organs on the head, proboscis, anterior and posterior regions ; 

 side-organs absent. Body vermiform, elongate ; anterior segments two-ringed and rounded ; 

 posterior segments flattened and about double the breath of the anterior. Branchise 

 simple or branched on feet. Alimentary canal with oesophagus, stomach, and accessory 

 gut opening in the last anterior and first posterior segment. Male genital opening single, 

 dorsal, between eighth and ninth segments ; female between seventh and eighth segments. 

 Male with genital hooks or copulatory organs and glands. Sterile anterior ovary opens 

 in fifth and sixth segments. Feet more or less retractile. Capillary bristles with 

 winged hooks. Nerve-cords coelomic anteriorly, hypodermic posteriorly. Provisional 

 and permanent nephridia, the latter forming a double loop. 



1. Capitella cafitata, 0. Fabricius, 1780. Plate XCII, fig. 3; Plate XCVIII, fig. 20 — 

 anterior region ; Rate CVII, figs. 10, 10 a, 11 and 1 2— bristle and hooks (fig. 12 from 

 a form with eyes). 



Specific Characters.— Cephalic region with eyes, snout conical, sharp-pointed. Body 

 about 5 in. in length, breadth 2 mm., generally less. Colour blood-red. Anterior region 

 of nine or ten bristled segments, and at the twelfth about double the breadth. Capillary 

 bristles and hooks on the seventh segment. First abdominal segment overlapping the 

 anterior region a little. Abdominal hooks shorter. Coelomic corpuscles yellowish-grey, 

 with small, dark yellow excretory bodies. Alimentary canal generally with yellowish 

 secretions (glands?). Genital sacs: a pair in the eighth anterior segment; genital pore 

 incurved. Ovary in first posterior segment. Copulatory apparatus near dorsal division 

 of the eighth or ninth segment, with genital hooks. Genital glands in the ninth segment. 

 Reproductive period, November to May: eggs dark greyish-brown. 



