174 Prof. :Mantosir3 Notes from the 



are prol)ahly connected with tlie special functions of tlie 

 region, wliicli may require a hook of a different type from 

 the ordinary winged form. 



Some ])lace the next form, viz. Magelova papWicornis, 

 Fritz Miiller, under a special family, but for the present it 

 may be included, as formerly, under the Spionidse. The head 

 (prostomium) is a large, flattened, and somewhat ovoid 

 muscuhtr process, with chitinous basement-tissue, marked 

 marginally by anastomosing vessels and forming a roof 

 to the peristomial segment beneath it. The mouth opens 

 Ycntrally, and the proboscis is extruded as a ))inkihh mush- 

 room-shaped organ. The tentacles are remarkably long 

 (2-3 inches), with large adhesive papillfe on the distal two- 

 thirds, and uon-caducous. Touches of dark pigment occur 

 as bars on them. The body is from 4-6 inches in length, 

 apparently of two well-marked regions — the anterior short, 

 consisting of 8 segments, and the posterior of more than 100 ; 

 but the peculiar 9th segment perhaps indicates a third 

 region. The body is somewhat quadrangular in section 

 throughout. The first region (of 8 segments) is narrowed 

 behind and marked by a dorsal and a ventral longituiinal 

 band, whilst the 9th segment is remarkaljly narrow. The 

 third region is anteriorly of greater diameter than the first, 

 continues of considerable breadth for some distance, and 

 then gradually tapers to the tail, wliich ends in a rounded 

 border having the anus within it, and with a short cirrus on 

 each side. The lateral regions of the greater part of the 

 third division of the body are modified into processes with 

 ])eculiar convoluted organs composed of the cuticle, hypo- 

 derm, and basement-tissue. 



TiiC dorsal lamellie of the first division are scoop-shaped, 

 and the ventral are similar though smaller. The bristles of 

 the region are capillary. The bristles of the 9th segment 

 are shaped like a mace ^ith a process at the tip, and differ 

 from all the others as do the lamella. The third or posterior 

 region has on each foot a row of winged hr.oks dorsally and 

 another ventrally at the edge of the quadrangular body, 

 whilst the somewhat ovate lamellte are between them. The 

 species ranges from Brazil to Britain. 



The interesting PceciloclKstiiS serpeijs of Dr. Allen *, from 

 Plymouth, probably comes near Disoma and Scalibreyma. 

 The pelagic post-larval types occur frequently at St. Andrev>s, 

 yet no adult has ever been found there. 



* Quart. Journ, Micr. Sc. vol. xlriii. p. 70, with plates vii.-xii. 



