378 Prof. M*Intosh*3 Notes from the 



other southern coasts. Tlie bluntly rounded head usually in 

 the preparations is devoid of eyes, though three are described 

 by l)e St. Joseph *, but lias well-marked nuchal organs, each 

 of which occasionally projects as a papilla on each side. In 

 some examjiles the head is paler than the succeeding region 

 and shows a pigment-speck (eye) on each side in front of the 

 brown band at the neck. The body is about an inch in 

 length, rounded dorsally and grooved ventrally, tapered at 

 each end, especially posteriorly, where the caudal process 

 forms a short cone with a few short terminal cirri (De St. 

 Joseph says from eight to twelve unequal cirri). Dorsally 

 the body sliows about twenty-eight or thirty transverse brown 

 bars, with a fine dusting of the same pigment between and 

 beyond them. The bars seem to have a detinite position, a 

 line drawn from their extremities striking the middle of each 

 space between the so-called eyes, and they thus nearly agree 

 with the number of segments mentioned by De St. Joseph, 

 viz. about thirty. These pigment-spots are the eyes of some 

 and the photogenic organs of Hesse and Benham. They 

 vary, according to De St. Joseph, from ten to sixteen, and 

 commence on the seventh segment. The densest dusting of 

 pigment appears to occur on the anterior and posterior ends, the 

 base of the caudal process, indeed, having a continuous brown 

 blotch. No example has a complete series of pigment-spots 

 (eyes), for they have been more or less bleached by long 

 preservation. 



Though at first sight the bristles are not evident, yet they 

 occur in a rudimentary condition in each segment as minute 

 tufts of simple tapering bristles, best seen towards the caudal 

 region. De St. Joseph, who had the opportunity of ex- 

 amining living specimens, observes that the bristles form 

 dorsal and ventral tufts with the intermediate lateral organ of 

 Meyer. 



Grube, Filippi, and Claparede's view that this form is 

 only a genus of the Opheliidaj would appear to be reasonable. 

 It resembles the Opheliidce in general aspect, in the iridescent 

 skin, in the arrangement of the ventral longitudinal muscles, 

 in the presence of the ventral groove between them and the 

 lateral groove above them, as well as in the form of the 

 caudal process and its papillae. It is further interesting to 

 note how closely the structure of the body-wall in Folygordius 

 approaches that in the present group, as shown long ago, and 

 as De St. Joseph more recently corroborates. 



* Aun. Sc. Nat. 8^ s6r. t. v. p. 386 (1898j. 



